J/ApJ/951/27 Heavily-obscured AGNs in the XMM-SERVS fields (Yan+, 2023)
The most obscured AGNs in the XMM-SERVS fields.
Yan W., Brandt W.N., Zou F., Zhu S., Chen C.-T.J., Hickox R.C., Luo B.,
Ni Q., Alexander D.M., Bauer F.E., Vignali C., Vito F.
<Astrophys. J., 951, 27 (2023)>
=2023ApJ...951...27Y 2023ApJ...951...27Y
ADC_Keywords: Active gal. nuclei; X-ray sources; Redshifts; Photometry, RI
Keywords: Active galactic nuclei ; AGN host galaxies ;
X-ray active galactic nuclei ; X-ray astronomy ;
Extragalactic astronomy
Abstract:
We perform X-ray spectral analyses to derive the characteristics
(e.g., column density, X-ray luminosity) of ∼10200 active galactic
nuclei (AGNs) in the XMM-Spitzer Extragalactic Representative Volume
Survey, which was designed to investigate the growth of supermassive
black holes across a wide dynamic range of cosmic environments. Using
physical torus models (e.g., Borus02) and a Bayesian approach, we
uncover 22 representative Compton-thick (CT; NH>1.5x1024cm-2)
AGN candidates with good signal-to-noise ratios as well as a large
sample of 136 heavily obscured AGNs. We also find an increasing CT
fraction (fCT) from low (z<0.75) to high (z>0.75) redshift. Our CT
candidates tend to show hard X-ray spectral shapes and dust extinction
in their spectral energy distribution fits, which may shed light on
the connection between AGN obscuration and host-galaxy evolution.
Description:
We uniformly extract the X-ray spectra of all X-ray point sources in
the three XMM-Spitzer Extragalactic Representative Volume Survey
(XMM-SERVS; Chen+ 2018, J/MNRAS/478/2132; Ni+ 2021, J/ApJS/256/21)
fields (Figure 1) with Science Analysis System tasks.
All fields in the XMM-SERVS are well covered with multiwavelength
surveys. See Section 3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 150 136 Heavily-obscured AGNS in each field of XMM-SERVS
(XMM-Spitzer Extragalactic Representative Volume
Survey)
table3.dat 149 22 Selected Compton-thick (CT; NH>1.5x1024cm-2)
AGNS candidates in each field of XMM-SERVS
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See also:
II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)
IX/69 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR13 (Webb+, 2023)
J/A+A/564/A125 : AGN Torus model comparison of AGN in CDFS (Buchner+, 2014)
J/ApJ/802/89 : Luminosity function of X-ray-selected AGNs (Buchner+, 2015)
J/MNRAS/478/2132 : XMM-LSS field. XMM-Newton point-source cat. (Cheng+, 2018)
J/ApJ/878/11 : Type 1 vs 2 X-ray COSMOS AGNs & environment (Zou+, 2019)
J/ApJS/256/21 : XMM-SERVS survey: W-CDF-S & ELAIS-S1 (Ni+, 2021)
J/ApJS/262/15 : X-ray-to-FIR SED in W-CDF-S, ELAIS-S1 & XMM-LSS (Zou+, 2022)
J/ApJ/943/162 : 31.3 deg2 Stripe 82X spectral analysis (Peca+, 2023)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Object identifier
11- 18 A8 --- Field Field identifier
20- 28 F9.6 deg RAdeg [8.8/54.4] Right Ascension (J2000)
30- 40 F11.7 deg DEdeg [-44.8/-3.9] Declination (J2000)
42- 51 F10.8 --- z [0.043/4.94] Redshift
53- 55 F3.1 --- f_z [0/1] Flag on z (0=photometric;
1=spectroscopic)
57- 68 F12.8 --- E_z [0/3.7]?=-99 Upper uncertainty in z
70- 81 F12.8 --- e_z [0/0.4]?=-99 Lower uncertainty in z
83- 93 F11.6 ct NCts [17.4/1258] Net counts
95- 99 F5.2 --- gamma [-0.4/0.19] Photon index from best-fit
power-law value
101- 105 F5.2 [10-7W] logLx [41.7/43.37] Log X-ray luminosity; erg/s (G1)
107- 111 F5.2 [10-7W] logLxc [42.53/44.24] Log corrected X-ray luminosity;
erg/s (G2)
113- 117 F5.2 [cm-2] logNH [22.71/24.03] Log H column density
119- 122 F4.2 [cm-2] E_logNH [0.12/0.8] Upper uncertainty in logNH
124- 127 F4.2 [cm-2] e_logNH [0.1/0.3] Lower uncertainty in logNH
129- 133 F5.2 % PHO [0.5/81] Posterior NH probability over
5e23cm-2
135- 139 F5.2 [10-7W] logL6 [43.24/45.6] Log 6 micron luminosity; erg/s
141- 150 F10.6 mag rmag [0/25.98]?=-99 Model r band magnitude (G3)
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Object identifier
11- 18 A8 --- Field Field identifier
20- 28 F9.6 deg RAdeg [9.5/53.8] Right Ascension (J2000)
30- 40 F11.7 deg DEdeg [-44.6/-4] Declination (J2000)
42- 51 F10.8 --- z [0.057/1.99] Redshift
53- 55 F3.1 --- f_z [0/1] Flag on z (0=photometric;
1=spectroscopic)
57- 68 F12.8 --- E_z [0.028/3.7]?=-99 Upper uncertainty in z
70- 81 F12.8 --- e_z [0.019/0.4]?=-99 Lower uncertainty in z
83- 92 F10.5 ct NCts [135/2097] Net counts
94- 98 F5.2 --- gamma [-0.71/-0.31] Photon index from best-fit
power-law value
100- 104 F5.2 [10-7W] logLx [41.74/43.22] Log X-ray luminosity; erg/s (G1)
106- 110 F5.2 [10-7W] logLxc [43.27/44.95] Log corrected X-ray luminosity;
erg/s (G2)
112- 116 F5.2 [cm-2] logNH [23.37/24.35] Log H column density
118- 121 F4.2 [cm-2] E_logNH [0.15/0.8] Upper uncertainty in logNH
123- 126 F4.2 [cm-2] e_logNH [0.11/0.3] Lower uncertainty in logNH
128- 131 F4.2 % PHO [0.42/0.95] Posterior NH probability over
5e23cm-2
133- 138 F6.2 [10-7W] logL6 [43.3/45.16]?=-99 Log 6 micron luminosity;
erg/s
140- 149 F10.6 mag rmag [16.6/26]?=-99 Model r band magnitude (G3)
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Global notes:
Note (G1): Observed X-ray luminosity in the rest frame without
absorption correction.
Note (G2): Intrinsic X-ray luminosity corrected using best-fitted absorption.
Note (G3): The HSC r band the XMM-LSS and W-CDF-S sources or forced photometry
in DES r band for ELAIS-S1 sources.
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Nomemclature notes:
Sources are <[NBC2021] ESNNNN>, <[NBC2021] WCDFSNNNN> or
<[CBL2018] XMMNNNNN> in Simbad.
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Aug-2025