J/ApJ/940/114 X-ray sources in the SSA22 Chandra field (Radzom+, 2022)
X-ray sources in the SSA22 Chandra field.
Radzom B.T., Taylor A.J., Barger A.J., Cowie L.L.
<Astrophys. J., 940, 114 (2022)>
=2022ApJ...940..114R 2022ApJ...940..114R
ADC_Keywords: X-ray sources; Redshifts; Spectra, optical; Active gal. nuclei
Keywords: Active galactic nuclei ; X-ray active galactic nuclei ;
Quasars ; X-ray quasars ; Galaxy evolution
Abstract:
The Hawaii Survey Field SSA22 is the fourth deepest Chandra X-ray
field. To allow for the fullest exploration of this field, we present
new optical spectroscopy from Keck/DEIMOS and Keck/LRIS, which, in
combination with the literature, brings the spectroscopic completeness
of the 2-8keV sample to 62%. We also make optical spectral
classifications and estimate photometric redshifts for the sources
without spectroscopic redshifts. We then determine hard X-ray
luminosity functions (XLFs) for the full sample of active galactic
nuclei (AGNs), as well as for the broad-line AGNs (BLAGNs) and the
non-BLAGNs separately. Our XLF for the full sample is in good
agreement with the literature, showing relatively strong evolution
over the redshift range 0.25≤z<4. The XLFs for the BLAGNs and the
non-BLAGNs imply distinct evolution with redshift, with BLAGNs
becoming increasingly dominant at higher redshifts and X-ray
luminosities.
Description:
Our full sample consists of 297 X-ray sources in a deep 400ks
Chandra/ACIS-I observation of the SSA22 field (P.I. D. Alexander;
Lehmer+ 2009, J/MNRAS/400/299). The field, which was previously
observed with Chandra/ACIS-S (P.I. G. Garmire;
Cowie+ 2003ApJ...584L..57C 2003ApJ...584L..57C), was centered on the z=3.09 galactic
protocluster described by Steidel+ (1998ApJ...492..428S 1998ApJ...492..428S). The X-ray
campaign consisted of four separate observations, ranging from about
70 to 120ks, taken between 2007 October 1 and December 30. The survey
was conducted over ∼330arcmin2.
We performed our own counterpart matching using a new optical catalog
constructed from rereduced imaging from Subaru/Hyper Suprime-Cam (HSC)
in the g, r, i, z, y, NB816, NB921, and NB926 bands (A. Taylor et al.
2022, in preparation). We supplement these data with archival U band
data from the Canada-France-Hawaii Telescope/MegaCam MegaPipe
reductions (observation ID: G012.334.588+00.283), K-band data cutouts
from UKIDSS-DR11PLUS, and Spitzer/IRAC 3.6, 4.5, 5.8, and 8.0um
archival Super Mosaics. See Section 2.2.
We obtained spectroscopic redshifts from our own spectra for
147 sources. These spectra include 126 from the Deep Imaging
Multi-Object Spectrograph (DEIMOS) on Keck II, and 50 from the
Low-Resolution Imaging Spectrometer (LRIS) on Keck I. See Section 2.3.
Objects:
--------------------------------------------------------------------------
RA (ICRS) DE Designation(s)
--------------------------------------------------------------------------
22 17 34.00 +00 17 00.9 NAME SSA22 Protocluster = EQ J221734.0+001701
--------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 72 297 Updated X-ray source catalog for SSA22
--------------------------------------------------------------------------------
See also:
B/chandra : The Chandra Archive Log (CXC, 1999-2014)
II/290 : SWIRE Photometric Redshift Catalogue (Rowan-Robinson+, 2008)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/455/75 : CFRS III: 1415+52 and 2215+00 fields (Lilly+ 1995)
J/A+A/409/79 : HELLAS2XMM survey. IV. (Fiore+, 2003)
J/ApJ/666/806 : SED of Spitzer quasars (QUEST) (Netzer+, 2007)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/MNRAS/400/299 : Chandra deep protocluster survey (Lehmer+, 2009)
J/ApJ/802/89 : Luminosity function of X-ray-selected AGNs (Buchner+, 2015)
J/MNRAS/450/2615 : Spectroscopy of galaxies in the SSA22 field (Saez+, 2015)
J/ApJ/887/23 : SUPER GOODS. IV. CDFS X sources with 850um (Barger+, 2019)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [LAC2009] [1/297] Lehmer+ 2009, J/MNRAS/400/299 ID
5- 6 I2 h RAh [22] Hour of Right Ascension (J2000)
8- 9 I2 min RAm [16/18] Minute of Right Ascension (J2000)
11- 15 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- [+] Sign of the Declination (J2000)
19- 20 I2 deg DEd [0] Degree of Declination (J2000)
22- 23 I2 arcmin DEm [6/24] Arcminute of Declination (J2000)
25- 29 F5.2 arcsec DEs Arcsecond of Declination (J2000)
31- 36 F6.3 --- zspec [-2/3.8] Best available spectroscopic
redshift (1)
38- 42 A5 --- r_zspec Reference(s) for zspec (2)
44- 48 F5.2 --- zphot [0.04/4.33]?=-1 LePhare photometric
redshift; see Section 2.5
50 A1 --- l_F0.5-2keV [-] Upper limit flag on F0.5-2keV
51- 58 E8.2 mW/m2 F0.5-2keV [4.9e-17/2.1e-14] Soft-band (0.5-2keV) flux,
erg/s/cm2
60 A1 --- l_F2-8keV [-] Upper limit flag on F2-8keV
61- 68 E8.2 mW/m2 F2-8keV [2.6e-16/4.4e-14] Hard-band (2-8keV) flux,
erg/s/cm2
70- 72 I3 --- Class [-10/5]? Spectral classification (3)
--------------------------------------------------------------------------------
Note (1): Values of -1.000 and -2.000 indicate no redshift (null value) and
star object, respectively.
Note (2): References for zspec as follows:
1 = this work;
2 = Saez et al. (2015, J/MNRAS/450/2615);
3 = Lehmer et al. (2009, J/MNRAS/400/299);
4 = Umehata et al. (2019Sci...366...97U 2019Sci...366...97U);
5 = Lilly et al. (1995ApJ...455...75L 1995ApJ...455...75L ; Cat. VII/225);
6 = Newman et al. (2010ApJ...717L.103N 2010ApJ...717L.103N);
7 = SDSS DR13; see Albareti 2017ApJS..233...25A 2017ApJS..233...25A
8 = Mawatari et al. (2021; arXiv:2110.11977)
-1 = no redshift
Note (3): Spectral classification (see Section 2.4) as follows:
-10 = No class (no measurement; null value; 130 occurrences)
-5 = No class (unsuccessful identification; 2 occurrences)
-2 = Star (17 occurrences)
0 = Absorber (17 occurrences)
1 = Star Former (88 occurrences)
3 = Type 2 AGN (8 occurrences)
4 = Broad-line AGN (BLAGN; 32 occurrences)
5 = Broad absorption line quasars (BALQSO; 3 occurrences)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Nov-2024