Search

Start Over Capability Type Simple Cone Search
15811. The WISE AGN candidates catalogs
ID:
ivo://CDS.VizieR/J/ApJS/234/23
Title:
The WISE AGN candidates catalogs
Short Name:
J/ApJS/234/23
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present two large catalogs of active galactic nucleus (AGN) candidates identified across 30,093deg^2^ of extragalactic sky from the Wide-field Infrared Survey Explorer's AllWISE Data Release. Both catalogs are selected purely using the Wide-field Infrared Survey Explorer (WISE) W1 and W2 bands. The R90 catalog consists of 4,543,530 AGN candidates with 90% reliability, while the C75 catalog consists of 20,907,127 AGN candidates with 75% completeness. These reliability and completeness figures were determined from a detailed analysis of UV- to near-IR spectral energy distributions of ~10^5^ sources in the 9deg^2^ Bootes field. The AGN selection criteria are based on those of Assef+ (2013, J/ApJ/772/26) recalibrated to the AllWISE data release. We provide a detailed discussion of potential artifacts and excise portions of the sky close to the Galactic Center, Galactic Plane, nearby galaxies, and other expected contaminating sources. These catalogs are expected to enable a broad range of science, and we present a few illustrative cases. From the R90 sample, we identify 45 highly variable AGNs lacking radio counterparts in the FIRST survey. One of these sources, WISEA J142846.71+172353.1, is a changing-look quasar at z=0.104, which has changed from having broad H{alpha} to being a narrow-lined AGN. We characterize our catalogs by comparing them to large, wide-area AGN catalogs in the literature. We identify four ROSAT X-ray sources that are each matched to three WISE-selected AGNs in the R90 sample within 30". Spectroscopy reveals that one of these systems, 2RXS J150158.6+691029, consists of a triplet of quasars at z=1.133+/-0.004, suggestive of a rich group or forming galaxy cluster.
15812. The WISE catalog of Galactic HII regions
ID:
ivo://CDS.VizieR/J/ApJS/212/1
Title:
The WISE catalog of Galactic HII regions
Short Name:
J/ApJS/212/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
Using data from the all-sky Wide-Field Infrared Survey Explorer (WISE) satellite, we made a catalog of over 8000 Galactic HII regions and HII region candidates by searching for their characteristic mid-infrared (MIR) morphology. WISE has sufficient sensitivity to detect the MIR emission from H II regions located anywhere in the Galactic disk. We believe this is the most complete catalog yet of regions forming massive stars in the Milky Way. Of the ~8000 cataloged sources, ~1500 have measured radio recombination line (RRL) or H{alpha} emission, and are thus known to be H II regions. This sample improves on previous efforts by resolving H II region complexes into multiple sources and by removing duplicate entries. There are ~2500 candidate H II regions in the catalog that are spatially coincident with radio continuum emission. Our group's previous RRL studies show that ~95% of such targets are H II regions. We find that ~500 of these candidates are also positionally associated with known H II region complexes, so the probability of their being bona fide H II regions is even higher. At the sensitivity limits of existing surveys, ~4000 catalog sources show no radio continuum emission. Using data from the literature, we find distances for ~1500 catalog sources, and molecular velocities for ~1500H II region candidates.
15813. The WISH catalogue at 352 MHz
ID:
ivo://CDS.VizieR/VIII/69A
Title:
The WISH catalogue at 352 MHz
Short Name:
VIII/69A
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Westerbork In the Southern Hemishpere (WISH) is a low-frequency (352MHz) radio survey that covers most of the sky between -25 and -15 degrees (1.60sr) at a wavelength of 92cm to a limiting flux density of approximately 18mJy (5sigma). Due to the very low elevation of the observations, the survey has a much lower resolution in declination than in right ascension (54"x54"cosec{delta}). A correlation with the 1.4GHz NVSS (VIII/65) shows that the positional accuracy is less constrained in declination than in right ascension, but there is no significant systematic error. The correlation with the NVSS was also used to construct a sample of faint Ultra Steep Spectrum sources (file uss.dat, table 2 of the paper). This sample is aimed at increasing the number of known high redshift radio galaxies to allow detailed follow-up studies of these massive galaxies and their environments in the early Universe. WISH is a collaboration between the Netherlands Foundation for Research in Astronomy (NFRA/ASTRON) and the Leiden Observatory. Carlos De Breuck, Yuan Tang, Ger de Bruyn, Huub Rottgering, Wil van Breugel, and Roeland Rengelink. For more information, see the WENSS home page at http://www.strw.leidenuniv.nl/wenss/ or contact wenss.people@strw.leidenuniv.nl
15814. The WMAP First Year Source Catalog (WMAP1)
ID:
ivo://CDS.VizieR/J/ApJS/148/97
Title:
The WMAP First Year Source Catalog (WMAP1)
Short Name:
J/ApJS/148/97
Date:
21 Oct 2021
Publisher:
CDS
Description:
The WMAP mission has mapped the full sky to determine the geometry, content, and evolution of the universe. Full-sky maps are made in five microwave frequency bands to separate the temperature anisotropy of the cosmic microwave background (CMB) from foreground emission, including diffuse Galactic emission and Galactic and extragalactic point sources. We define masks that excise regions of high foreground emission, so CMB analyses can be carried out with minimal foreground contamination. We also present maps and spectra of the individual emission components, leading to an improved understanding of Galactic astrophysical processes.
15815. The Wolf-Rayet content of M33 (NGC 598)
ID:
ivo://CDS.VizieR/J/ApJ/733/123
Title:
The Wolf-Rayet content of M33 (NGC 598)
Short Name:
J/ApJ/733/123
Date:
21 Oct 2021
Publisher:
CDS
Description:
Wolf-Rayet (WR) stars are evolved massive stars, and the relative number of WC-type and WN-type WRs should vary with metallicity, providing a sensitive test of stellar evolutionary theory. The observed WC/WN ratio is much higher than that predicted by theory in some galaxies but this could be due to observational incompleteness for WN types, which have weaker lines. Previous studies of M33's WR content show a galactocentric gradient in the relative numbers of WCs and WNs, but only small regions have been surveyed with sufficient sensitivity to detect all of the WNs. Here, we present a sensitive survey for WRs covering all of M33, finding 55 new WRs, mostly of WN type. Our spectroscopy also improves the spectral types of many previously known WRs, establishing in one case that the star is actually a background quasar. The total number of spectroscopically confirmed WRs in M33 is 206, a number we argue is complete to ~5%, with most WRs residing in OB associations, although ~2% are truly isolated.
15816. The 64W part of the WRST Survey
ID:
ivo://CDS.VizieR/J/A+AS/73/103
Title:
The 64W part of the WRST Survey
Short Name:
J/A+AS/73/103
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a deep 92cm survey down to 4.5mJy (5{sigma}) carried out with the Westerbork Synthesis Radio Telescope (WSRT) of a field in Lynx, previously observed at three other radio frequencies: 6, 21, and 49cm. The observations, totalising 4*12h were made in the redundancy mode, which makes it possible to achieve a high dynamic range. In total, 384 sources above a 5{sigma} peak flux limit were detected, of which 337 form a complete sample.
15817. The 65W part of the WSRT 21 cm survey in Lynx
ID:
ivo://CDS.VizieR/J/A+AS/71/221
Title:
The 65W part of the WSRT 21 cm survey in Lynx
Short Name:
J/A+AS/71/221
Date:
21 Oct 2021
Publisher:
CDS
Description:
Observations of the field Lynx 3A, obtained at 21cm with 5{sigma} peak flux 85{mu}Jy using the 3-km array of the Westerbork Synthesis Radio Telescope for 16x12h periods during 1984, are reported. Details of the observations and the data reduction are given, and the results are presented in extensive tables and maps. A complete sample of 321 objects within the 0.5{deg} attenuation radius is selected from the 349 objects detected above 85{mu}Jy, and the 1.412GHz source counts down to 100{mu}Jy are found to be in good agreement with VLA surveys of similar depth. The median angular size of sources with total flux density between 350{mu}Jy and 10mJy is shown to be less than 10arcsec.
15818. The XMM-ATLAS catalogues
ID:
ivo://CDS.VizieR/J/A+A/577/A121
Title:
The XMM-ATLAS catalogues
Short Name:
J/A+A/577/A121
Date:
21 Oct 2021
Publisher:
CDS
Description:
Wide area X-ray and far infrared surveys are a fundamental tool to investigate the link between AGN growth and star formation, especially in the low-redshift universe (z<1). The Herschel Terahertz Large Area survey (H-ATLAS) has covered 550deg^2^ in five far-infrared and sub-mm bands, 16deg^2^ of which have been presented in the Science Demonstration Phase (SDP) catalogue. Here we introduce the XMM-Newton observations in H-ATLAS SDP area, covering 7.1deg^2^ with flux limits of 2*10^-15^, 6*10^-15^, and 9*10^-15^erg/s/cm^2^ in the 0.5-2, 0.5-8 and 2-8keV bands, respectively. We present the source detection and the catalogue, which includes 1700, 1582 and 814 sources detected by emldetect in the 0.5-8, 0.5-2 and 2-8keV bands, respectively; the number of unique sources is 1816. We extract spectra and derive fluxes from power-law fits for 398 sources with more than 40 counts in the 0.5-8keV band. We compare the best-fit fluxes with the catalogue ones, obtained by assuming a common photon index of Gamma=1.7; we find no bulk difference between the fluxes, and a moderate dispersion of s=0.33dex. Using wherever possible the fluxes from the spectral fits, we derive the 2-10keV Log N-Log S, which is consistent with a Euclidean distribution. Finally, we release computer code for the tools developed for this project.
15819. The XMM-CDFS catalogues
ID:
ivo://CDS.VizieR/J/A+A/555/A42
Title:
The XMM-CDFS catalogues
Short Name:
J/A+A/555/A42
Date:
21 Oct 2021
Publisher:
CDS
Description:
Nuclear obscuration plays a key role in the initial phases of AGN growth, yet not many highly obscured AGN are currently known beyond the local Universe, and their search is an active topic of research. The XMM-Newton survey in the Chandra Deep Field South (XMM-CDFS) aims at detecting and studying the spectral properties of a significant number of obscured and Compton-thick (NH=10^24^cm^-2^ ) AGN. The large effective area of XMM-Newton in the 2-10 and 5-10keV bands, coupled with a 3.45Ms nominal exposure time (2.82 and 2.45Ms after lightcurve cleaning for MOS and PN respectively), allows us to build clean samples in both bands, and makes the XMM-CDFS the deepest XMM-Newton survey currently published in the 5-10keV band. The large multi- wavelength and spectroscopic coverage of the CDFS area allows for an immediate and abundant scientific return. In this paper, we present the data reduction of the XMM-CDFS observations, the method for source detection in the 2-10 and 5-10keV bands, and the resulting catalogues. A number of 339 and 137 sources are listed in the above bands with flux limits of 6.6x10^-16^ and 9.5x10^-16^erg/s/cm^2^, respectively. The flux limits at 50% of the maximum sky coverage are 1.8x10^-15^ and 4.0x10^-15^erg/s/cm^2^, respectively. The catalogues have been cross-correlated with the Chandra ones: 315 and 130 identifications have been found with a likelihood- ratio method, respectively. A number of 15 new sources, previously undetected by Chandra, is found; 5 of them lie in the 4Ms area. Redshifts, either spectroscopic or photometric, are available for ~92% of the sources. The number counts in both bands are presented and compared to other works. The survey coverage has been calculated with the help of two extensive sets of simulations, one set per band. The simulations have been produced with a newly-developed simulator, written with the aim of the most careful reproduction of the background spatial properties. For this reason, we present a detailed decomposition of the XMM-Newton background into its components: cosmic, particle, and residual soft protons. The three components have different spatial distributions. The importance of these three components depends on the band and on the camera; the particle background is the most important one (80-90% of the background counts), followed by the soft protons (4-20%).
15820. The 3XMM-DR7s Stacked Catalogue at ESA
ID:
ivo://esavo/xsa/cs/3xmmdr7s
Title:
The 3XMM-DR7s Stacked Catalogue at ESA
Short Name:
3XMM-DR7-stacked
Date:
07 Feb 2024 10:08:23
Publisher:
European Space Agency
Description:
The 3XMM-DR7s Stacked Catalogue at ESA

Limit your search

more »

more »

more »

more »

more »

more »