J/A+A/556/A114 Obscured AGNs in XMM deep survey in CDF-S (Castello-Mor+, 2013)
The XMM deep survey in the CDF-S.
VI. Obscured AGN selected as infrared power-law galaxies.
Castello-Mor N., Carrera F.J., Alonso-Herrero A., Mateos S., Barcons X.,
Ranalli P., Perez-Gonzalez P.G., Comastri A., Vignali C.,
Georgantopoulos I.
<Astron. Astrophys., 556, A114 (2013)>
=2013A&A...556A.114C 2013A&A...556A.114C
ADC_Keywords: Surveys ; Active gal. nuclei ; X-ray sources ; Infrared sources
Keywords: X-rays: galaxies - galaxies: active - infrared: galaxies - surveys
Abstract:
Accretion onto supermassive black holes is believed to occur mostly in
obscured active galactic nuclei (AGN). Such objects are proving rather
elusive in surveys of distant galaxies, including those at X-ray
energies. Our main goal is to determine whether the revised IRAC
criteria of Donley et al. (2012ApJ...748..142D 2012ApJ...748..142D; objects with an
infrared (IR) power-law spectral shape), are effective at selecting
X-ray type-2 AGN (i.e., absorbed NH>1022cm-2).
We present the results from the X-ray spectral analysis of 147 AGN
selected by cross-correlating the highest spectral quality ultra-deep
XMM-Newton and the Spitzer/IRAC catalogues in the Chandra Deep Field
South. Consequently it is biased towards sources with high S/N X-ray
spectra. In order to measure the amount of intrinsic absorption in
these sources, we adopt a simple X-ray spectral model that includes a
power-law modified by intrinsic absorption at the redshift of each
source and a possible soft X-ray component.
Description:
The near- and mid-IR source catalogue used for this work has been
built from Spitzer/IRAC observations (the selection being made at
3.6um and 4.5um).
The X-ray data presented in this paper were obtained from the CDF-S
XMM-Newton survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 147 Details of the X-ray sources with IRAC
counterpart found in this analysis
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See also:
B/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2013)
J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/A+A/555/A42 : The XMM-CDFS catalogues (Ranalli+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID210 [2/390] Identification number of X-ray source
listed in Ranalli et al. (2013, J/A+A/555/A42)
5- 9 F5.3 --- z Redshift of the source rounded to two
(photometric) or three (spectroscopic) decimal
10 A1 --- f_z [p] 'p' for photometric redshift
12- 18 F7.4 aW/m2 RX Observed 2-10keV flux of the source
(in 10-15erg/cm2/s)
19- 26 F8.3 10+35W LX Unabsorbed rest-frame 2-10keV luminosity of the
source using the best fit model (1042erg/s)
27- 28 A2 --- l_Gamma [<≥ ] Limit flag on Gamma
29- 32 F4.2 --- Gamma X-ray photon index Γ
33 A1 --- n_Gamma [+] + indicates that Γ was assumed
34- 40 F7.3 10+22cm-2 NHi ?=- Intrinsic column density NH measured from
the best fit model in column Model
42- 46 F5.3 keV kT ?=- Electron temperature for the soft
Comptonisation component
48 A1 --- Mod [A-E] Best-fitting model for the spectrum (1)
50 A1 --- n_Mod [XV] Flag to denote whether the sources is
classified as IR power-law (V) or
IR no-power-law galaxy (X)
52- 53 A2 --- l_NH0 [<≥ ] Limit flag on confidence interval
54- 60 F7.3 10+22cm-2 NH0 ?=- Lower value of 1σ confidence interval
on the intrinsic column density measured
using models C, D, E
61 A1 --- --- [-]
62- 68 F7.2 10+22cm-2 NH1 ? Upper value of 1σ confidence interval
on the intrinsic column density measured
using models C, D, E
70 A1 --- Cl [au-] Classification of the source:
a=absorbed, u=unabsorbed, -=unclassified
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Note (1): the 5 models are described in Section 3.1 of the paper:
A = powerlaw
B = black-body + lowerlaw
C = zphabs (restframe photoelectric absorption) x powerlaw
D = black-body + (phabs x powerlaw)
E = powerlaw + (zphabs x powerlaw)
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History:
From electronic version of the journal
References:
Comastri et al., Paper I 2011A&A...526L...9C 2011A&A...526L...9C
Iwasawa et al., Paper II 2012A&A...546A..84I 2012A&A...546A..84I
Ranalli et al., Paper III 2013A&A...555A..42R 2013A&A...555A..42R, Cat. J/A+A/555/A42
Georgantopoulos et al., Paper IV 2013A&A...555A..43G 2013A&A...555A..43G
Falocco et al., Paper V 2013A&A...555A..79F 2013A&A...555A..79F
(End) Patricia Vannier [CDS] 22-Nov-2013