J/ApJS/218/8 Swift AGN and Cluster Survey (SACS). I. (Dai+, 2015)
The Swift AGN and Cluster Survey.
I. Number counts of AGNs and galaxy clusters.
Dai X., Griffin R.D., Kochanek C.S., Nugent J.M., Bregman J.N.
<Astrophys. J. Suppl. Ser., 218, 8 (2015)>
=2015ApJS..218....8D 2015ApJS..218....8D
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Photometry, infrared ;
Clusters, galaxy ; Surveys
Keywords: catalogs; galaxies: active; galaxies: clusters: general; surveys;
X-rays: galaxies: clusters
Abstract:
The Swift active galactic nucleus (AGN) and Cluster Survey (SACS) uses
125deg2 of Swift X-ray Telescope serendipitous fields with variable
depths surrounding γ-ray bursts to provide a medium depth
(4x10-15erg/cm2/s) and area survey filling the gap between deep,
narrow Chandra/XMM-Newton surveys and wide, shallow ROSAT surveys.
Here, we present a catalog of 22563 point sources and 442 extended
sources and examine the number counts of the AGN and galaxy cluster
populations. SACS provides excellent constraints on the AGN number
counts at the bright end with negligible uncertainties due to cosmic
variance, and these constraints are consistent with previous
measurements. We use Wide-field Infrared Survey Explorer (WISE)
mid-infrared (MIR) colors to classify the sources. For AGNs we can
roughly separate the point sources into MIR-red and MIR-blue AGNs,
finding roughly equal numbers of each type in the soft X-ray band
(0.5-2keV), but fewer MIR-blue sources in the hard X-ray band
(2-8keV). The cluster number counts, with 5% uncertainties from cosmic
variance, are also consistent with previous surveys but span a much
larger continuous flux range. Deep optical or IR follow-up
observations of this cluster sample will significantly increase the
number of higher-redshift (z>0.5) X-ray-selected clusters.
Description:
The Swift XRT observations of GRB fields were downloaded from the
HEASARC website. This includes ∼9yr of data through 2013 July 27.
We matched the sources to the WISE all-sky catalog (see section 3.2).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 117 22563 Swift point sources detected in the total X-ray
(0.2-10keV) band
table2.dat 117 17748 Swift point sources detected in the soft X-Ray
(0.5-2keV) band
table3.dat 117 10060 Swift point sources detected in the hard X-ray
(2-10keV) band
table4.dat 103 442 Swift extended source candidates detected in the
soft X-ray band (0.5-2keV)
table5.dat 39 200 Cluster detection probability
--------------------------------------------------------------------------------
See also:
IX/43 : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)
VIII/91 : Planck Catalog of Compact Sources Release 1 (Planck, 2013)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
J/ApJS/216/28 : SWXCS III. Clusters from 2005-2012 Swift data (Liu+, 2015)
J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)
J/A+A/551/A142 : 7yr Swift-XRT point source catalog (1SWXRT) (D'Elia+, 2013)
J/A+A/547/A57 : Swift X-ray Telescope Cluster Survey (Tundo+, 2012)
J/ApJS/200/8 : AGES: the AGN and Galaxy Evolution Survey (Kochanek+, 2012)
J/MNRAS/425/1215 : Multiwavelength survey of AGNs (Klesman+, 2012)
J/A+A/534/A109 : MCXC Meta-Catalog X-ray galaxy Clusters (Piffaretti+, 2011)
J/ApJS/195/10 : The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
J/A+A/528/A122 : SwiftFT catalog (Puccetti+, 2011)
J/ApJ/729/22 : SEDs of galaxy cluster members (Atlee+, 2011)
J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)
J/A+A/493/339 : XMM-Newton serendipitous Survey. V. (Watson+, 2009)
J/ApJS/172/561 : The 400d cluster Survey (Burenin+, 2007)
J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+ 2007)
J/ApJ/660/239 : MaxBCG catalog of galaxy clusters from SDSS (Koester+, 2007)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/ApJS/150/19 : ChaMP. I. First X-ray source catalog (Kim+, 2004)
J/ApJS/140/265 : WARPS survey. VI. (Perlman+, 2002)
J/AJ/122/2810 : Chandra Deep Field North Survey. V. (Brandt+, 2001)
J/MNRAS/318/333 : Extended ROSAT Bright Cluster Sample (Ebeling+ 2000)
J/ApJ/514/148 : ROSAT survey of bright galaxies clusters (De Grandi+, 1999)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
J/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)
http://heasarc.gsfc.nasa.gov/ : HEASARC home page
http://www.swift.ac.uk/xrt_positions/ : Swift-XRT GRB positions
Byte-by-byte Description of file: table[123].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SACS]
6- 22 A17 --- SACS Source identifier (JHHMMSS.s+DDMMSS)
24- 31 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000)
33- 38 F6.4 deg e_RAdeg [0/0.03] Uncertainty in RAdeg
40- 47 F8.4 deg DEdeg Declination in decimal degrees (J2000)
49- 54 F6.4 deg e_DEdeg [0/0.001] Uncertainty in DEdeg
56- 63 F8.3 ct/ks CR [0.01/1770] Count rate in X-ray band
65- 70 F6.3 ct/ks e_CR Uncertainty in CR
72- 79 F8.2 10-17W/m2 Flux Flux in X-ray band; 10-14erg/s/cm2
81- 87 I7 s Exp [174/1133723] Exposure time
89- 93 F5.2 mag [3.4] [0.6/19.5]?=99 WISE 3.4 um band magnitude
95- 99 F5.2 mag [4.6] [0.7/18.2]?=99 WISE 4.6 um band magnitude
101-105 F5.2 mag [12] [-2/15]?=99 WISE/W3 12 um band magnitude
107-111 F5.2 mag [22] [-3/11]?=99 WISE/W4 22 um band magnitude
113-117 F5.2 arcsec Sep [0.01/25]?=99 Swift/XRT and WISE
positional offset
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SWCL]
6- 22 A17 --- SWCL Source identifier (JHHMMSS.s+DDMMSS)
24- 31 F8.4 deg RAdeg Right Ascension (J2000)
33- 40 F8.4 deg DEdeg Declination (J2000)
42- 46 F5.1 arcsec CSize [10.7/113.3] Core size
48- 52 F5.1 arcsec Extent [17.7/234.5] Extent
54- 60 F7.3 ct/ks CR [0.08/193] The 0.5-2keV count rate
62- 66 F5.3 ct/ks e_CR [0.01/5] Uncertainty in CR
68- 73 F6.2 10-17W/m2 Flux [0.1/393] The 0.5-2keV X-ray flux;
in 10-14erg/s/cm2
75- 79 F5.2 0.36/s/deg2 Bkg [0.8/18.1] Background count rate
in 10-4ct/s/arcmin2
81- 84 F4.1 arcmin Off [0.9/15] Off-Axis angle
86- 92 I7 s Exp [4254/1058699] Exposure time
94- 96 A3 --- --- [grb]
97-103 A7 --- GRB GRB field (YYMMDDa)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Net [5/100] Net photons (1)
6- 11 F6.4 ct/pix Bkg [0.002/0.3] Background level (1)
13- 18 F6.4 --- Pz=0.2 Cluster detection probability at z=0.2 (1)
20- 25 F6.4 --- Pz=0.6 Cluster detection probability at z=0.6 (1)
27- 32 F6.4 --- Pz=1.0 Cluster detection probability at z=1.0 (1)
34- 39 F6.4 --- Pz=1.4 Cluster detection probability at z=1.4 (1)
--------------------------------------------------------------------------------
Note (1): We assumed Rc=0.1Mpc and β=0.6 for the simulation,
corresponding to a total mass of ∼2x1014M☉ and close to
the mass limit of our survey.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Jul-2015