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501. MassiveYoungStar-FormingComplexStudyinIR&X-Rays:Mid-IRSourceCatalogs
ID:
ivo://nasa.heasarc/mystixmidi
Title:
MassiveYoungStar-FormingComplexStudyinIR&X-Rays:Mid-IRSourceCatalogs
Short Name:
MYSTIXMIDI
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
Spitzer IRAC observations and stellar photometric catalogs are presented for the Massive Young star-forming complex Study in the Infrared and X-ray (MYStIX). MYStIX is a multi-wavelength census of young stellar members of 20 nearby (distances < 4 kpc), Galactic, star-forming regions (SFRs) that contain at least one O-type star. All regions have data available from the Spitzer Space Telescope consisting of GLIMPSE or other published catalogs for 11 regions and results of the authors' own photometric analysis of archival data for the remaining 9 regions. The authors also reduced the GLIMPSE data for the W 3 SFR using the aperture photometry method in order to compare the results obtained using the two methods (see Section 3.4.2 of the reference paper). The reference paper seeks to construct deep and reliable catalogs of sources from the Spitzer images. Mid-infrared study of these regions faces challenges of crowding and high nebulosity. These new catalogs typically contain fainter sources than existing Spitzer studies, which improves the match rate to Chandra X-ray sources that are likely to be young stars, but increases the possibility of spurious point-source detections, especially peaks in the nebulosity. IRAC color-color diagrams help distinguish spurious detections of nebular polycyclic aromatic hydrocarbon (PAH) emission from the infrared excess associated with dusty disks around young stars. The distributions of sources on the mid-infrared color-magnitude and color-color diagrams reflect differences between MYStIX regions, including astrophysical effects such as stellar ages and disk evolution. The GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) Survey is a Legacy Science Program of the Spitzer Space Telescope to study star formation in the disk of the Milky Way Galaxy. It contains six MYStIX regions - the Lagoon Nebula, the Trifid Nebula, NGC 6334, the Eagle Nebula, M 17, and NGC 6357 - within the 2-degree wide strip along the Galactic equator (GLIMPSE I and II data releases). Furthermore, Spitzer images and photometry for RCW 38 and NGC 3576 come from the Vela-Carina survey (Majewski et al. 2007, Spitzer Proposal 40791), using a similar observing strategy with mosaicking and photometric analysis as performed with the GLIMPSE pipeline. The authors obtained publicly available raw IRAC images from the Spitzer Heritage Archive for nine MYStIX regions without GLIMPSE coverage. The target list and details of the Astronomical Observation Requests (AORs) are provided in Table 1 of the reference paper. The camera spatial resolutions are FWHM = 1.6" to 1.9" from 3.6 to 8.0um. This table contains the combined IRAC source lists from the GLIMPSE photometry of W 3 and the aperture photometry of the 9 SFRs listed in Table 4, part 1 of the reference paper. This table was created by the HEASARC in February 2014 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/209/29">CDS Catalog J/ApJS/209/29</a> files table2.dat and table3.dat. To distinguish from which table a source originated, the HEASARC has added a parameter called table_number listing the number of the source table, 2 or 3. This is a service provided by NASA HEASARC .
502. MassiveYoungStar-FormingComplexStudyinIR&X-Rays:X-RaySourceCatalog
ID:
ivo://nasa.heasarc/mystixxray
Title:
MassiveYoungStar-FormingComplexStudyinIR&X-Rays:X-RaySourceCatalog
Short Name:
MYSTIXXRAY
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The Massive Young Star-forming complex Study in Infrared and X-ray (MYStIX) uses data from the Chandra X-Ray Observatory to identify and characterize the young stellar populations in 20 Galactic (d < 4 kpc) massive star-forming regions. In this present study, the X-ray analysis for Chandra ACIS-I observations of 10 of the MYStIX fields is described, and a catalog of > 10,000 X-ray sources is presented in this table. In comparison to other published Chandra source lists for the same regions, the number of MYStIX-detected faint X-ray sources in a region is often doubled. While the higher catalog sensitivity increases the chance of false detections, it also increases the number of matches to infrared stars. X-ray emitting contaminants include foreground stars, background stars, and extragalactic sources. The X-ray properties of sources in these classes are discussed in the reference paper. The X-ray observations were made with the imaging array on the Advanced CCD Imaging Spectrometer (ACIS-I) on board the Chandra X-Ray Observatory. This array of four CCD detectors subtends 17' x 17' on the sky. The number of different Chandra pointings for each region, the total exposures for these pointings, and details of how the observations were taken are provided in Table 1 of the reference paper. Overall, 29 Chandra ObsIDs are included with typical integration times for a pointing of 40 - 100 ks, sufficient to detect most OB stars and lower-mass pre-main-sequence stars down to ~ 0.5 - 1 solar masses for the MYStIX regions. The 10 MYStIX MSFRs treated herein are listed in Table 2 of the reference paper. The data were acquired from the Chandra Data Archive from 2001 Jan to Mar 2008 for 10 MYStIX fields (the Flame Nebula, RCW 36, NGC 2264, the Rosette Nebula, the Lagoon Nebula, NGC 2362, DR 21, RCW 38, Trifid Nebula and NGC 1893). The X-ray photometry is from Broos et al. (2010, ApJ, 714, 1582; ACIS Extract); see also the CCCP, Broos et al. (2011, ApJS, 194, 2). The source significance quantities (fb_prob_no_src, sb_prob_no_src, hb_prob_no_src and prob_no_src_min) are computed using a subset of each source's extractions chosen to maximize significance (Broos et al. 2010, ApJ, 714, 1582, Section 6.2). The source position and positional uncertainty quantities are computed using a subset of each source's extractions chosen to minimize the position uncertainty (Broos et al. 2010, ApJ, 714, 1582, Sections 6.2 and 7.1). All other quantities are computed using a subset of each source's extractions chosen to balance the conflicting goals of minimizing photometric uncertainty and of avoiding photometric bias (Broos et al. 2010, ApJ, 714, 1582, Sections 6.2 and 7). The observed and absorption-corrected energy fluxes and their associated errors and the estimated hydrogen column densities and their uncertainties are derived using non-parametric procedures (XPHOT, Getman et al. 2010, ApJ, 708, 1760). XPHOT assumes the X-ray spectral shapes of young, low-mass stars, which come from coronal X-ray emission. XPHOT quantities will therefore be unreliable for high-mass stars, for which X-ray emission is associated with the stellar wind. This table was created by the HEASARC in January 2014 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/209">CDS Catalog J/ApJS/209</a> 27 file xmystix.dat. This is a service provided by NASA HEASARC .
503. 2MASS Redshift Survey (2MRS) Catalog
ID:
ivo://nasa.heasarc/twomassrsc
Title:
2MASS Redshift Survey (2MRS) Catalog
Short Name:
TWOMASSRSC
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
This table is based on the results of the 2MASS Redshift Survey (2MRS), a ten-year project to map the full three-dimensional distribution of galaxies in the nearby universe. The Two Micron All Sky Survey (2MASS) was completed in 2003 and its final data products, including an extended source catalog (XSC), are available online. The 2MASS XSC contains nearly a million galaxies with K<sub>s</sub> <= 13.5 mag and is essentially complete and mostly unaffected by interstellar extinction and stellar confusion down to a galactic latitude of |b| = 5 degrees for bright galaxies. Near-infrared wavelengths are sensitive to the old stellar populations that dominate galaxy masses, making 2MASS an excellent starting point to study the distribution of matter in the nearby universe. The authors selected a sample of 44,599 2MASS galaxies with K<sub>s</sub> <= 11.75 mag and |b| >= 5 degrees (>= 8 degrees toward the Galactic bulge) as the input catalog for their survey. They obtained spectroscopic observations for 11,000 galaxies and used previously obtained velocities for the remainder of the sample to generate a redshift catalog that is 97.6% complete to well-defined limits and covers 91% of the sky. This provides an unprecedented census of galaxy (baryonic mass) concentrations within 300 Mpc. Earlier versions of their survey have been used in a number of publications that have studied the bulk motion of the Local Group, mapped the density and peculiar velocity fields out to 50 h<sup>-1</sup> Mpc, detected galaxy groups, and estimated the values of several cosmological parameters. Additionally, the authors present morphological types for a nearly complete sub-sample of 20,860 galaxies with K<sub>s</sub> <= 11.25 mag and |b| >= 10 degrees. The authors initially selected 45,086 sources which met the following criteria: <pre> K<sub>s</sub> <= 11.75 mag and detected at H, E(B - V) <= 1 mag, |b| >= 5 degrees for 30 degrees < l < 330 degrees, |b| >= 8 degrees otherwise. </pre> They rejected 324 sources of galactic origin (multiple stars, planetary nebulae, and H II regions) or pieces of galaxies detected as separate sources by the 2MASS pipeline. Additionally, they flagged 314 bona fide galaxies with compromised photometry for reprocessing at a future date. Some of these galaxies have bright stars very close to their nuclei which were not detected by the pipeline. Others are in regions of high stellar density and their center positions and/or isophotal radii have been incorrectly measured by the pipeline. Lastly, some are close pairs or multiples but the pipeline only identified a single object. A detailed explanation of the steps taken to reject and reprocess the flagged galaxies is given in the Appendix of the reference paper. In summary, the final input catalog contained here has 44,599 entries (plotted using black symbols in Figure 1 of the reference paper). In this table, redshifts for 43,533 of the selected galaxies, or 97.6% of the sample, are presented. This table was created by the HEASARC in April 2012 based on an electronic version of Table 3 of the reference paper which was obtained from the ApJS website. This is a service provided by NASA HEASARC .
504. Master EUV Catalog
ID:
ivo://nasa.heasarc/euv
Title:
Master EUV Catalog
Short Name:
EUV
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The EUV database table is the Extreme Ultraviolet (EUV) Master Catalog and contains a compendium of EUV sources. It is comprised of selected fields from the following HEASARC EUV database tables: <pre> * <a href="/W3Browse/all/euvebsl.html">EUVEBSL</a> - First Extreme UltraViolet Explorer Bright Source List * <a href="/W3Browse/all/euvecat2.html">EUVECAT2</a> - Second Extreme UltraViolet Explorer Source Catalog * <a href="/W3Browse/all/roswfc2re.html">ROSWFC2RE</a> - ROSAT Wide Field Camera 2RE Catalog * <a href="/W3Browse/all/rosatxuv.html">ROSATXUV</a> - ROSAT Wide Field Camera Pointed Phase Catalog of XUV Sources * <a href="/W3Browse/all/euverap1.html">EUVERAP1</a> - First Extreme UltraViolet Explorer Right Angle Program Catalog * <a href="/W3Browse/all/euverap2.html">EUVERAP2</a> - Second Extreme UltraViolet Explorer Right Angle Program Catalog * <a href="/W3Browse/all/euverap3.html">EUVERAP3</a> - Third Extreme UltraViolet Explorer Right Angle Program Catalog * <a href="/W3Browse/all/euvexrtcat.html">EUVEXRTCAT</a> - All-Sky Catalog of Faint EUV Sources </pre> Notice that we have not included EUVECAT1 (First Extreme UltraViolet Explorer Source Catalog) and WFCBSC (ROSAT Wide Field Camera Bright Source Catalog), as these are obsolete catalogs superceded by EUVECAT2 and ROSWFC2RE, respectively. The EUVEBSL database table contains a detailed list of verified bright EUVE sources detected during the survey phase of the EUVE mission (calibration targets are also included). Two distinct surveys, the all-sky and deep surveys, were conducted by the four EUVE telescopes during the first six months of the mission. EUVEBSL contains 356 sources. EUVECAT2 is the 2nd Catalog of EUV objects detected by the Extreme Ultraviolet Explorer (EUVE) and published by Bowyer et al. in 1996 (ApJS, 102, 129). The data include (i) all-sky survey detections from the initial 6-months scanner survey phase, (ii) additional scanner detections made later during specially programmed observations designed to fill in low-exposure sky areas of the initial survey, (iii) sources detected with deep-survey telescope observations along the ecliptic plane, (iv) objects detected by the scanner telescopes during targeted spectroscopy observations, and (v) other observations. Plausible optical, X-ray, radio, and/or UV identifications are available for about 65% of the EUV sources. EUVECAT2 contains 801 sources. ROSWFC2RE is the ROSAT Wide Field Camera 2RE Source Catalog. It contains 479 EUV sources found during the ROSAT all-sky survey of July 1990 to January 1991. The information in this database is based on what has been published by Pye et al. (1995, MNRAS, 274, 1165). It supersedes the earlier WFC Bright Source Catalog (WFCBSC), but we have retained the latter in the EUV database for reasons of completeness The ROSATXUV database table is a catalog of XUV sources (Kreysing H.C., Brunner H., and Staubert, R. 1995, A&AS, 114, 465), extracted from observations by the ROSAT Wide Field Camera during the pointed phase. The 5916 WFC pointed observations that were included are from the calibration and verification phase in June 1990 and from the period of pointed observations from February 9, 1991 to July 15, 1994. The catalog contains 1022 independent source detections corresponding to 4 different filters (S1, S2, P1 and P2) and 328 individual sources, many of which were observed repeatedly. Only ROSATXUV detections in the S1 filter band are included in the EUV table. If there are multiple observations of a single source/position in ROSATXUV, then only one entry for that source will be present in the EUV Master Catalog. The EUVERAP1 database table contains the detections of 114 extreme-ultraviolet (EUV; 58 - 740 Angstrom) sources, of which 99 are new serendipitous sources, based on observations covering approximately 8% of the sky which were made with the imaging telescopes on board the Extreme Ultraviolet Explorer (EUVE) during the Right Angle Program (RAP). These data were obtained using the survey scanners and the Deep Survey instrument during the first year of the spectroscopic guest observer phase of the mission, from January 1993 to January 1994. The data set consists of 162 discrete pointings whose exposure times are typically two orders of magnitude longer than the average exposure times during the EUVE all-sky survey. The EUVERAP2 database table is a catalog of 235 extreme ultraviolet (EUV) sources, of which 169 are new detections, using the EUVE Observatory's Right Angle Program (RAP) data obtained with the A, B and C scanners and the Deep Survey (DS) instrument in the period from January 1994 through November 1998. The EUVE RAP used the all-sky survey telescopes (also known as the "scanners"), which were mounted at right angles to the Deep Survey and Spectrometer (DS/S) instruments, in order to obtain photometric data in four wavelength bands centered at 100 Angstroms (Lexan/B), 200 A (Al/Ti/C), 400 A (Ti/Sb/Al or Dagwood), and 550 A (Sn/SiO). The EUVERAP2 catalog covers 17% of the sky and includes observations that were made subsequent to the publication of the first EUVE RAP catalog (EUVERAP1, which listed RAP data that had been obtained up until 1994 January); the data from EUVERAP1, together with additional RAP data obtained through 1994 December, are contained in the EUVECAT2 database table (The Second EUVE All-Sky Catalog of Bowyer et al. 1996, ApJS, 102, 129). Thus, RAP sources detected in 1994 will be contained in both EUVECAT2 and EUVERAP2, albeit different selection criteria were used in the two catalogs. The EUVERAP3 database table is a catalog of 76 extreme ultraviolet (EUV) sources, of which 63 are new detections, using the EUVE's RAP data. This catalog concentrates on observations made in the last years of the RAP, 1999 and 2000, with a sky coverage of 7% of the sky. The EUVEXRTCAT database table is a catalog of 534 objects detected jointly in the Extreme Ultraviolet Explorer (EUVE) (100 Angstrom (AA) band) All-Sky Survey and in the ROSAT X-ray Telescope (XRT) (0.25 keV band) All-Sky Survey. The joint selection criterion within a 1.5 arcminute positional tolerance permitted the use of a low count rate threshold in each survey. This low threshold was roughly 60% of the threshold used in the previous EUVE all-sky surveys, and 166 of the objects listed in this table were new EUV sources, appearing neither in the Second EUVE Source Catalog nor in the ROSAT Wide Field Camera Second Catalog. Preliminary identifications are offered for 105 of the 166 sources not previously reported in any EUV catalog: by far the most numerous (81) of the identifications are late-type (F-M) stars, while 18 are other stellar types, only 5 are white dwarfs, and none are extragalactic. The paucity of WDs and extragalactic objects may be explained by a strong horizon effect wherein interstellar absorption strongly limits the effective new-source search volume, and, thereby, selectively favors low-luminosity nearby sources over more luminous but distant objects. Notice that, with the adopted 1.5 arcminute acceptance criterion, about 50 spurious detections are expected. This database is periodically updated by the HEASARC whenever one of the component database tables is modified or a new component database table is added. This is a service provided by NASA HEASARC .
505. Master Radio Catalog
ID:
ivo://nasa.heasarc/radio
Title:
Master Radio Catalog
Short Name:
Radio
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The RADIO database table is a periodically revised master catalog that contains selected parameters from a number of the HEASARC database tables that have information on radio source flux densities. The contents of this RADIO master catalog are listed in alphabetical order in the References section of this document. Each entry in RADIO has a parameter called `database_table` which indicates the originating database table from which the entry was copied. Users should check out the original database table if they want to examine all of the parameters that are available in that particular database table for the particular source(s) in which they are interested. Two of the component database tables of RADIO, DIXON and KUEHR, are compilations of radio observations, and individual sources can have multiple entries, representing either observations at different frequencies or multiple observations at the same frequency. In the latter case, notice, the flux density quoted in the RADIO database is an average of the individual flux densities at that particular frequency in the originating database. To see all of the individual entries for a source in RADIO from either of these two component databases, the corresponding entries in the DIXON and KUEHR database tables should be examined. The HEASARC in certain instances has included radio sources for which the quoted value for the specified band is an upper limit rather than a detection. The HEASARC recommends that the user should always check the original tables to get the complete information about the properties of the sources listed in the RADIO master source list. This database table is periodically updated by the HEASARC whenever one of the component database tables is modified or a new component database table is added. This is a service provided by NASA HEASARC .
506. Master X-Ray Catalog
ID:
ivo://nasa.heasarc/xray
Title:
Master X-Ray Catalog
Short Name:
X-ray
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The XRAY database table contains selected parameters from almost all HEASARC X-ray catalogs that have source positions located to better than a few arcminutes. The XRAY database table was created by copying all of the entries and common parameters from the tables listed in the Component Tables section. The XRAY database table has many entries but relatively few parameters; it provides users with general information about X-ray sources, obtained from a variety of catalogs. XRAY is especially suitable for cone searches and cross-correlations with other databases. Each entry in XRAY has a parameter called 'database_table' which indicates from which original database the entry was copied; users can browse that original table should they wish to examine all of the parameter fields for a particular entry. For some entries in XRAY, some of the parameter fields may be blank (or have zero values); this indicates that the original database table did not contain that particular parameter or that it had this same value there. The HEASARC in certain instances has included X-ray sources for which the quoted value for the specified band is an upper limit rather than a detection. The HEASARC recommends that the user should always check the original tables to get the complete information about the properties of the sources listed in the XRAY master source list. This master catalog is updated periodically whenever one of the component database tables is modified or a new component database table is added. This is a service provided by NASA HEASARC .
507. MAXI/GSC 7-Year High and Low Galactic Latitude Source Catalog (3MAXI)
ID:
ivo://nasa.heasarc/maxigsc7yr
Title:
MAXI/GSC 7-Year High and Low Galactic Latitude Source Catalog (3MAXI)
Short Name:
MAXIGSC7YR
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
This table combines the published X-ray source catalogs of the high galactic latitude (|b| > 10<sup>o</sup>), Kawamuro et 2018, and the low galactic latitude (|b| < 10<sup>o</sup>), Hori et al. 2018, based on 7 years of MAXI Gas Slit Camera (GSC) data from 2009 August 13 to 2016 July 31. The low galactic latitude catalog contains 221 sources with a significance threshold > 6.5 sigma. The low galactic faintest source has a flux of 5.2 x 10<sup>-12</sup> erg cm<sup>-2</sup> s<sup>-1</sup> (or an intensity of 0.43 mCrab) in the 4-10 keV band. The high galactic latitude catalog contains 686 sources detected at significances >= 6.5 sigma in the 4-10 keV band. The high galactic 4-10 keV sensitivity reaches ~0.48 mCrab, or ~5.9 x 10<sup>-12</sup> erg cm<sup>-2</sup> s<sup>-1</sup>, over half of the survey area. The same data-screening criteria were applied to obtain the low and high galactic catalogs. In their papers the authors describe the detection method, the statistical quantities derived for each source and their variability. To derive a counterpart, each source was cross-matched with the Swift/BAT 105-month catalog (BAT105; Oh et al. 2018), the Uhuru fourth catalog (4U; Forman et al. 1978), the RXTE All-Sky Monitor long-term observed source table (XTEASMLONG16), Meta-Catalog of X-Ray Detected Clusters of Galaxies (MCXC; Piffaretti et al. 2011), the XMM-Newton Slew Survey Catalog (XMMSL217), and the ROSAT All-Sky Survey Bright Source Catalog (1RXS; Voges et al. 1999). Seven of the sources in the low galactic latitudes were detected by binning the data differently (source numbers 215-221 in the catalog named 73-day sources), and, similarly, four of the sources in the high galactic latitude catalog named transient sources. The parameters in the combined table include the source name (3MAXI), the position and its error, the detection significances and fluxes in the 4-10 keV, 3-4 keV bands and 10-20 keV bands the hardness ratios (HR1: 3-4 keV, 4-10 keV and HR2: 4-10 keV, 10-20 keV), excess variance in the 4-10 keV lightcurve and information on the likely counterpart. The high galactic catalogs also reports the flux in the 3-10 keV, an additional hardness (HR3: 3-10 keV and 10-20 keV) and an additional parameter representing variability. The hardness ratios are defined as H-S/H+S were S and H are the soft- and hard-band fluxes, respectively. This table was created by the HEASARC in April 2021. It is a combination of the 7-year low- and high-latitude MAXI source catalogs published on ApJS. The data for the low-galactic latitude and the high-galactic latitude were downloaded from the ApJS electronic version of the Hori et al. 2018 ApJS 235,7 and Kawamuro et al. 2018 ApJS 238,33 papers respectively. The low-latitude data included in this table are from tables 4, 5, 6, 7 of the Hori paper that report the X-ray sources detected (214 sources, table 4), their possible identification (table 5), the transient sources discovered binning the data on 73 days period (7 sources, table 5) and their identification (table 6). The high-latitude data included in this table are from the tables 1,2,3 of the Kawamuro paper that report the X-ray sources detected (682 sources in table 1), their identifications (table 2), and the transient sources (4 sources in table 3). The low and high galactic latitude source catalogs provide for each individual source similar parameters for the X-ray properties with the high-latitude having three additional parameters, specifically, the flux in the 3-10 keV energy range, the 3-10/10-20-keV hardness ratio, and a time variability test. These parameters are kept in the HEASARC combined table and set to "blank" values for the low-latitude sources. The four sources in the high-latitude catalog named transient sources have only fluxes in the 4-10 keV band and no other fluxes in the other energy bands or the hardness ratio are reported. The HEASARC combined table includes a field to identify whether the source is from the low-latitude paper or the high-latitude paper and also maintains the source numbers that were published in the original catalogs. This is a service provided by NASA HEASARC .
508. MAXI Master Catalog
ID:
ivo://nasa.heasarc/maximaster
Title:
MAXI Master Catalog
Short Name:
MAXIMASTER
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The MAXIMASTER database table records high-level information of the Monitor of All-sky X-ray Image (MAXI) observations and provides access to the data archive. MAXI is a Japanese experiment located at the International Space Station (ISS), designed to continuously monitor, through a systematic survey, X-ray sources as the ISS orbits Earth. MAXI was launched by the space shuttle Endeavour on 2009 July 16, then mounted on port No. 1 on JEM-EF on July 24. After the electric power was turned on, MAXI started nominal observations on 2009 August 3. The MAXI data are a copy of the MAXI data processing; the output of which is hosted at the DARTS archive located at ISAS (<a href="https://darts.isas.jaxa.jp/astro/maxi/">https://darts.isas.jaxa.jp/astro/maxi/</a>). This catalog is then generated at the HEASARC by collecting high-level information from the data and is updated regularly during operation. This is a service provided by NASA HEASARC .
509. MAXI/SSC Catalog of X-Ray Sources in 0.7-7.0 keV Band
ID:
ivo://nasa.heasarc/maxissccat
Title:
MAXI/SSC Catalog of X-Ray Sources in 0.7-7.0 keV Band
Short Name:
MAXISSCCAT
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
This table contains the first source catalog of the Solid-state Slit Camera (SSC) of the Monitor of All-sky X-ray Image (MAXI) mission located on the International Space Station, using the 45 months of data from 2010 August 1 to 2014 April 30 in the 0.7-7.0 keV band. Sources were searched for in two energy bands, 0.7-1.85 keV (the soft band) and 1.85-7.0 keV (the hard band), limiting sensitivities of 3 and 4 mCrab, respectively, were achieved, and 140 and 138 sources were detected in the soft and hard energy bands, respectively. Combining the two energy bands, 170 sources are listed in the MAXI/SSC catalog. All but 2 sources are identified, with 22 galaxies (including AGNs), 29 cluster of galaxies, 21 supernova remnants, 75 X-ray binaries, 8 stars, 5 isolated pulsars, and 9 non-categorized objects. Comparing the soft-band fluxes at the brightest end in this catalog with the ROSAT survey, which was performed about 20 years ago, 10% of the catalogued sources are found to have changed flux since the ROSAT era. This table was created by the HEASARC in December 2016 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/PASJ/68/S32">CDS Catalog J/PASJ/68/S32</a> file table5.dat. This is a service provided by NASA HEASARC .
510. M 31 Bulge Chandra X-Ray Point Source Catalog
ID:
ivo://nasa.heasarc/m31cxo2
Title:
M 31 Bulge Chandra X-Ray Point Source Catalog
Short Name:
M31CXO2
Date:
25 Apr 2025
Publisher:
NASA/GSFC HEASARC
Description:
The authors explore the population of X-ray point sources in the bulge of M 31 so as to contrast properties of various subpopulations, such as persistent and transient sources and primordial LMXBs and dynamically formed ones. Based on the data from 26 archival Chandra ACIS observations with aim-points within 10 arcminutes of the center of M 31 (J2000 coordinates of 00:42:44.31, +41:16:09.4), the authors study the source content and properties of various subpopulations of X-ray sources to a maximum distance of 12 arcminutes from the center of M 31. To a limiting luminosity of ~10<sup>35</sup> erg s<sup>-1</sup>, the authors find 263 X-ray point sources, with ~1/3 of these being background galaxies. A study of the spatial distribution and the luminosity function of the X-ray sources shows that the distribution of primordial LMXBs is consistent with the distribution of the K-band light and that their luminosity function flattens below ~10<sup>37</sup> erg s<sup>-1</sup> to the dN/dL ~ L<sup>-1</sup> law in agreement with the behavior found earlier for LMXBs in the Milky Way and in Cen A. Within a radius of 12 arcminutes, the luminosity function is independent of distance to the center of M 31, in contrast to earlier Chandra studies. The LMXBs located in globular clusters and within ~1 arcminute from the center of M 31 are presumably created via dynamical interactions. The dynamical origin of the r < 1 arcminute sources is strongly suggested by their radial distribution which follows the rho<sub>*</sub><sup>2</sup> profile rather than the K-band light distribution. Their luminosity function shows a prominent fall-off below log(L<sub>X</sub>) <~ 36.5. Although the statistics are insufficient to claim a genuine low-luminosity cut-off in the luminosity function, the best fit power-law with a slope of -0.6 +/- 0.2 is significantly flatter than the dN/dL ~ L<sup>-1</sup> law. The authors also searched for transients and found 28 sources that varied by a factor larger than 20. Their spatial distribution follows the distribution of the persistent LMXBs within the accuracy allowed by the limited number of transients. This HEASARC table was created in March 2010 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/468/49">CDS catalog J/A+A/468/49</a> file table2.dat. This is a service provided by NASA HEASARC .