Validation Level: 2 - STScI NAVO Directory Search Results

25291. XTE All-Sky Slew Survey AGN Catalog

ID:: ivo://nasa.heasarc/xteassagn
Title:: XTE All-Sky Slew Survey AGN Catalog
Short Name:: XTEASSAGN
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: This table contains the RXTE All-Sky Slew Survey Catalog of AGN and AGN candidates. The catalog authors compiled a sample of 95 AGNs which were serendipitously detected in the 3-20 keV band at Galactic latitude |b| > 10 degrees during the RXTE Slew Survey (XSS, Revnivtsev et al., CDS Cat. <J/A+A/418/927>), and utilized it to study the statistical properties of the local population of AGN, including the X-ray luminosity function and absorption distribution. They find that among low X-ray luminosity (LX < 1043.5 erg/s) AGN, the ratio of absorbed (characterized by intrinsic absorption in the range 1022 cm-2 < NH < 1024 cm-2) and unabsorbed (NH < 1022 cm-2) objects is 2:1, while this ratio drops to less than 1:5 for higher luminosity AGN. The summed X-ray output of AGN with LX > 1041 erg/s estimated here is smaller than the earlier estimated total X-ray volume emissivity in the local Universe, suggesting that a comparable X-ray flux may be produced together by lower luminosity AGN, non-active galaxies and clusters of galaxies. The authors also presented a sample of 35 AGN candidates, composed of unidentified XSS sources. Most of these AGN belong to the local population (z < 0.1). For each confirmed AGN source, the following information is provided: AGN class, the count rate in two energy bands (3-8 keV and 8-20 keV), the observed and intrinsic (absorption-corrected) luminosity in the 3 - 20keV band, and the intrinsic absorption column density. For the AGN candidates, composed of unidentified XSS sources, the following information is provided: the count rate in two energy bands (3-8 keV and 8-20 keV), the estimated intrinsic absorption column density, and information about RASS Bright Source Catalog and HEAO A-1 X-ray source counterparts. This table was created by the HEASARC in December 2004 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/423/469">CDS Catalog J/A+A/423/469</a>, table1.dat and table2.dat (the corrected version of 01-Dec-2004). This is a service provided by NASA HEASARC .

25292. XTE All-Sky Slew Survey Catalog

ID:: ivo://nasa.heasarc/xteasscat
Title:: XTE All-Sky Slew Survey Catalog
Short Name:: XTEASSCAT
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: The Rossi X-Ray Timing Explorer (RXTE) All-Sky Survey Slew Catalog contains the results of a serendipitous hard X-ray (3 - 20 keV), nearly all-sky (|b|>10 degrees) survey based on observations by RXTE's Proportional Counter Array (PCA) which were performed during satellite reorientations in the period 1996 - 2002. The survey is 80% (90%) complete to a 4-sigma limiting flux of ~1.8 (2.5)x10-11 erg/s/cm2 in the 3 - 20 keV band. The achieved sensitivity in the 3 - 8 keV and 8 - 20 keV subbands is similar to and an order of magnitude higher than that of the previously record HEAO-1 A1 and HEAO-1 A4 all-sky surveys, respectively. A combined 7 x 103 square degree area of the sky is sampled to flux levels below 10-11 erg/s/cm2 (3 - 20 keV). In total 294 sources are detected and localized to better than ~1 degree; 236 (80%) of these can be confidently associated with a known astrophysical object; 22 of these sources have multiple counterparts (17 have 2 counterparts and 5 have 3 counterparts) with which they have been identified, and as these are listed as separate entries, there are 321 entries in this table. 35 detected sources remain unidentified, although for 12 of these we report a likely soft X-ray counterpart from the ROSAT all-sky survey bright source catalog. Of the reliably identified sources, 63 have a local origin (Milky Way, LMC or SMC), 64 are clusters of galaxies and 100 are active galactic nuclei (AGN). The fact that the unidentified X-ray sources have hard spectra suggests that the majority of them are AGN, including highly obscured ones (hydrogen column density > 1023 cm-2). This dataset enabled the authors to present for the first time a log N - log S diagram for extragalactic sources above 4 x 10-12 erg/s/cm2 at 8 - 20 keV. This database table was created by the HEASARC in May 2004 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/418/927">CDS Catalog J/A+A/418/927</a>. This is a service provided by NASA HEASARC .

25293. XTE Archived Public Slew Data

ID:: ivo://nasa.heasarc/xteslew
Title:: XTE Archived Public Slew Data
Short Name:: XTESLEW
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: This database table is a catalog of all the RXTE slew observations and is based on information culled from the RXTE Data Archive's latest top-level FMI (FITS Master Index) file that is created when data products are made publicly available each week. ObsIDs listed in this table are available for download from <a href="https://heasarc.gsfc.nasa.gov/FTP/xte/data/archive/">https://heasarc.gsfc.nasa.gov/FTP/xte/data/archive/</a>. See the parameter 'data_loc' for the relative location of specific ObsIDs. The XTESLEW database table is updated automatically, usually on a weekly basis whenever the RXTE GOF updates the top-level FMI for the public data archive and notifies the HEASARC. This is a service provided by NASA HEASARC .

25294. XTE J1550-564 quasi-periodic oscillations

ID:: ivo://CDS.VizieR/J/MNRAS/428/1704
Title:: XTE J1550-564 quasi-periodic oscillations
Short Name:: J/MNRAS/428/1704
Date:: 21 Oct 2021
Publisher:: CDS
Description:: In this paper, we investigate the energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations (QPOs; 0.08-20Hz) in XTE J1550-564. We have used the observational data from the Rossi X-ray Timing Explorer during the first half part of the 1998-1999 outburst. We have found that the centroid frequency of the fundamental QPO did not vary with photon energy when its QPO frequency was less than ~0.4-0.8Hz and it did not increase much when its frequency was between ~0.8 and ~3.3Hz. However, it clearly increased with photon energy when it was larger than ~3.3Hz. The most interesting point is that it increased much more quickly with photon energy when its centroid frequency was between ~6 and ~8.5Hz. Subsequently, its rising rate dropped sharply when its frequency was larger than ~8.5Hz.

25295. XTE Master Catalog

ID:: ivo://nasa.heasarc/xtemaster
Title:: XTE Master Catalog
Short Name:: RXTE
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: This database table was created for the purpose of providing a comprehensive, accurate, and easily accessible tracking of Rossi X-Ray Timing Explorer (RXTE) pointed observations. It does not list observations made during slews: those are listed in the <a href="/W3Browse/xte/xteslew.html">XTESLEW</a> database table. The XTEMASTER table includes both observations that have already completed and those still scheduled to be done. The XTEMASTER table is regenerated automatically on a quasi-regular basis whenever the RXTE Science Operations Facility (SOF) updates their short-term or long-term schedules and transfers the new version(s) to the HEASARC. At that time, it will also incorporate all the latest information on which targets have been observed (using the daily RXTE ObsCats at <a href="https://heasarc.gsfc.nasa.gov/FTP/xte/timelines/obscat/">https://heasarc.gsfc.nasa.gov/FTP/xte/timelines/obscat/</a>) and which observations have been archived in the public RXTE Data Archive at <a href="https://heasarc.gsfc.nasa.gov/FTP/xte/data/archive/">https://heasarc.gsfc.nasa.gov/FTP/xte/data/archive/</a>. This is a service provided by NASA HEASARC .

25296. XTE Mission-Long Source Catalog

ID:: ivo://nasa.heasarc/xtemlcat
Title:: XTE Mission-Long Source Catalog
Short Name:: XTEMLCAT
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: This table contains the RXTE Mission-Long Source Catalog. It is generated from the RXTE Mission-Long Data Products, which are based on the standard data products (StdProds) from the PCA and HEXTE, for over 200 sources that have been observed many times with RXTE during its mission. Please refer to the <a href="/docs/xte/recipes/mllc_start.html">RXTE GOF documentation</a> for more information. This database table, first created in April 2008, contains the RXTE Mission-Long Source Catalog created by <a href="/docs/xte/xte_1st.html">RXTE GOF</a>. The catalog is updated by the RXTE GOF on a monthly basis; this HEASARC Browse table will be updated within one week of any updates made by the RXTE GOF. This is a service provided by NASA HEASARC .

25297. XTEProposalInfo&Abstracts

ID:: ivo://nasa.heasarc/xteao
Title:: XTEProposalInfo&Abstracts
Short Name:: XTEAO
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: The XTEAO database table contains the official observing program for the Rossi X-Ray Timing Explorer (RXTE) satellite. This list contains the targets recommended by the review panels for the various Cycles of Guest Observer (GO) proposals up to and including Cycle 15. Notice that not all entries in this list will actually be observed, since it includes observations of Targets of Opportunity (ToOs) which may never be triggered. Also note that multiple pointings at a particular target are permitted. This database table was updated by the HEASARC periodically, based on information provided by the RXTE Guest Observer Facility (GOF). This is a service provided by NASA HEASARC .

25298. XTE Target Index Catalog

ID:: ivo://nasa.heasarc/xteindex
Title:: XTE Target Index Catalog
Short Name:: RXTE
Date:: 14 Feb 2025
Publisher:: NASA/GSFC HEASARC
Description:: The Rossi X-ray Timing Explorer (RXTE) Index table was created for the purpose of providing a concise and easily accessible tracking of RXTE observations, both those already completed and those still scheduled to be done. Each entry in this table corresponds to a specific proposal/target combination or `complete observation', in contrast to the RXTE Master table in which each entry corresponds to a specific proposal/target/ObsID combination or `observing segment'. A complete observation can consist of many (in some cases dozens) observing segments. This is a service provided by NASA HEASARC .

25299. XUV-Disk galaxies in the Local Universe

ID:: ivo://CDS.VizieR/J/ApJS/173/538
Title:: XUV-Disk galaxies in the Local Universe
Short Name:: J/ApJS/173/538
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Here we compare GALEX UV and visible-NIR images of 189 nearby (D<40Mpc) S0-Sm galaxies included in the GALEX Atlas of Nearby Galaxies (Gil de Paz et al. 2007, Cat. J/ApJS/173/185) and present the first catalog of XUV-disk galaxies. We find that XUV-disk galaxies are surprisingly common but have varied relative (UV/optical) extent and morphology. Type 1 objects (>~20% incidence) have structured, UV-bright/optically faint emission features in the outer disk, beyond the traditional star formation threshold. Type 2 XUV-disk galaxies (~10% incidence) exhibit an exceptionally large, UV-bright/optically low surface brightness (LSB) zone having blue UV-K_s_ outside the effective extent of the inner, older stellar population, but not reaching extreme galactocentric distance.

25300. XX Cep BVRI light curves

ID:: ivo://CDS.VizieR/J/MNRAS/379/1665
Title:: XX Cep BVRI light curves
Short Name:: J/MNRAS/379/1665
Date:: 21 Oct 2021
Publisher:: CDS
Description:: We obtained CCD photometric observations of the Algol-type semidetached binary XX Cephei (XX Cep) during 15 nights from 2002 September 17 to 2003 February 2, and also on 2005 January 21. Except for those data taken on the last night of the concentrated observing season, the 3881 measurements were obtained over an interval of only 106 nights. From these data, four new times of minimum light were calculated. The (O-C) diagram formed from all available timings, and thus the orbital period of the system, can be partly represented as a beat effect between two cyclical variations with different periods (P1'=42yr, P2'=181yr) and amplitudes (K1=0.015d, K2=0.103d), respectively. Both physical and non-physical interpretations of these cycles were investigated.

Search

Search Constraints

Search Results

25291. XTE All-Sky Slew Survey AGN Catalog

25292. XTE All-Sky Slew Survey Catalog

25293. XTE Archived Public Slew Data

25294. XTE J1550-564 quasi-periodic oscillations

25295. XTE Master Catalog

25296. XTE Mission-Long Source Catalog

25297. XTEProposalInfo&Abstracts

25298. XTE Target Index Catalog

25299. XUV-Disk galaxies in the Local Universe

25300. XX Cep BVRI light curves

Limit your search

Subject

Publisher

Resource Type

Content Level

Instrument

Facility

Validation Level

Rights

Capability Type

Result Type