2022A&A...661A...5L


Query : 2022A&A...661A...5L

2022A&A...661A...5L - Astronomy and Astrophysics, volume 661A, 5-5 (2022/5-1)

The eROSITA Final Equatorial-Depth Survey (eFEDS). The AGN catalog and its X-ray spectral properties.

LIU T., BUCHNER J., NANDRA K., MERLONI A., DWELLY T., SANDERS J.S., SALVATO M., ARCODIA R., BRUSA M., WOLF J., GEORGAKAKIS A., BOLLER T., KRUMPE M., LAMER G., WADDELL S., URRUTIA T., SCHWOPE A., ROBRADE J., WILMS J., DAUSER T., COMPARAT J., TOBA Y., ICHIKAWA K., IWASAWA K., SHEN Y. and MEDEL H.I.

Abstract (from CDS):


Context. The eROSITA Final Equatorial Depth Survey (eFEDS), observed with eROSITA ahead of its planned 4-yr all-sky survey, is the largest contiguous-field X-ray survey at present. It yielded a large sample of X-ray sources with very rich multiband photometric and spectroscopic coverage.
Aims. We present here the eFEDS active galactic nuclei (AGN) catalog and the eROSITA X-ray spectral properties of the eFEDS sources.
Methods. Using a Bayesian method, we performed a systematic X-ray spectral analysis for all the eFEDS sources. We adopted multiple spectral models, including single-component power-law or hot-plasma models and double-component models of a power law plus soft excess. We investigated the capacity of eROSITA X-ray spectra for constraining AGN spectral shapes through a detailed analysis of the posterior parameter probability distribution functions. Hierarchical Bayesian modeling was used to recover the spectral parameter distribution of the sample. The source fluxes and luminosities were measured from the posterior of the spectral fitting.
Results. The eFEDS AGN catalog (22 079 sources) comprises ∼80% of the eFEDS point sources. Despite a large number of faint sources, our spectral fitting provides reasonable measurements of spectral shapes and intrinsic luminosities for a majority of the sources. Because of sample selection bias, this AGN catalog is dominated by X-ray unobscured sources, with an obscured (logNH > 21.5) fraction of 8%; the power-law emission of the hot corona is also relatively soft, with a typical slope of 2.0. For type-I AGN, the X-ray emission is well correlated with the UV emission with the usual anticorrelation between the X-ray to UV spectral slope αOX and the UV luminosity. The X-ray spectral properties measured with various models are presented for all the eFEDS sources.

Abstract Copyright: © T. Liu et al. 2022

Journal keyword(s): surveys - catalogs - galaxies: active - galaxies: nuclei - quasars: general - X-rays: galaxies

VizieR on-line data: <Available at CDS (J/A+A/661/A5): table1.dat-table10.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1962 1
2 LEDA 88588 Sy1 07 08 41.4886614696 -49 33 06.308921700   16.02 15.7 12.7   ~ 466 0
3 2MASX J09325962+0405062 Sy1 09 32 59.6038446336 +04 05 06.019364508   18.14 17.55     ~ 19 0

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2022.08.09-15:08:13

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