J/ApJS/140/265 WARPS survey. VI. (Perlman+, 2002)
The WARPS survey. VI. Galaxy cluster and source identifications from phase I.
Perlman E.S., Horner D.J., Jones L.R., Scharf C.A., Ebeling H., Wegner G.,
Malkan M.
<Astrophys. J. Suppl. Ser. 140, 265 (2002)>
=2002ApJS..140..265P 2002ApJS..140..265P
ADC_Keywords: Surveys ; Clusters, galaxy ; X-ray sources
Keywords: surveys - X-rays: galaxies: clusters - X-rays: general
Abstract:
We present in catalog form the optical identifications for objects
from the first phase of the Wide Angle ROSAT Pointed Survey (WARPS).
WARPS is a serendipitous survey of relatively deep, pointed ROSAT
observations for clusters of galaxies. The X-ray source detection
algorithm used by WARPS is Voronoi Tessellation and Percolation (VTP),
a technique which is equally sensitive to point sources and extended
sources of low surface brightness. WARPS-I is based on the central
regions of 86 ROSAT PSPC fields, covering an area of 16.2 square
degrees. We describe here the X-ray source screening and optical
identification process for WARPS-I, which yielded 34 clusters at
0.06<z<0.75. Twenty-two of these clusters form a complete,
statistically well-defined sample drawn from 75 of these 86 fields,
covering an area of 14.1 square degrees, with a flux limit of
F(0.5x2.0keV)=6.5x10-14erg/cm2/s. This sample can be used to study
the properties and evolution of the gas, galaxy and dark matter
content of clusters and to constrain cosmological parameters. We
compare in detail the identification process and findings of WARPS
to those from other recently published X-ray surveys for clusters,
including RDCS, SHARC-Bright, SHARC-south, and the CfA 160deg2
survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 140 150 WARPS-I Source Catalog
table3.dat 130 44 Other Sources
table4.dat 100 22 WARPS-I Statistically Complete, Flux Limited Sample
table5.dat 106 17 WARPS-I Additional Clusters and Candidates
table6.dat 96 21 Radio Sources within 2' of WARPS Cluster Candidates
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See also:
VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999)
J/ApJS/126/209 : Bright SHARC survey cluster catalog (Romer+, 2000)
J/MNRAS/311/456 : RIXOS source catalogue (Mason+, 2000)
Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [WARP]
5- 16 A12 --- WARPS Assigned source name, JHHMM.m+DDMM
18- 28 A11 --- RName ROSAT pointing field containing the source
30- 31 I2 h RAh ROSAT Hour of Right Ascension (J2000) (1)
33- 34 I2 min RAm ROSAT Minute of Right Ascension (J2000) (1)
36- 39 F4.1 s RAs ROSAT Second of Right Ascension (J2000) (1)
41 A1 --- DE- ROSAT Sign of the Declination (J2000) (1)
42- 43 I2 deg DEd ROSAT Degree of Declination (J2000) (1)
45- 46 I2 arcmin DEm ROSAT Arcminute of Declination (J2000) (1)
48- 49 I2 arcsec DEs ROSAT Arcsecond of Declination (J2000) (1)
51- 57 F7.2 10-3ct/s RCRate Raw VTP count rate (2)
59- 65 F7.2 10-3ct/s CCRate Corrected (i.e., total) VTP count rate (2)
67- 71 F5.2 10+20/cm2 NH Galactic hydrogen column density from
Dickey & Lockman (1990ARA&A..28..215D 1990ARA&A..28..215D)
73- 78 F6.2 10-13mW/m2 Flux Unabsorbed 0.5-2.0keV X-ray flux in
units of 10-13erg/cm2/s (3)
80- 83 F4.2 --- Ext ? Extent parameter (4)
85- 86 A2 --- Im Source imaging passband (5)
88 A1 --- Sp Spectroscopic follow-up status (6)
90- 94 A5 --- ID Source identification (7)
96-101 F6.4 --- z ? Redshift
102 A1 --- u_z []:p] Flag on z (8)
104-108 A5 --- SpType Spectral type (for stars)
110-140 A31 --- Notes Other Name and additional notes (G1)
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Note (1): Typical error is 15".
Note (2): Where VTP represents the Voronoi Tessellation and Percolation
detection algorithm.
Note (3): For clusters of galaxies, the flux was calculated using the same
iterative method used by Ebeling et al (1998, Cat. J/MNRAS/301/881).
We assume a Raymond-Smith spectrum with a redshift appropriate for
each cluster and metal abundance of 0.3 solar. The temperature of the
model was derived iteratively by constraining the cluster to obey the
observed L-T relation White, Jones & Forman (1997MNRAS.292..419W 1997MNRAS.292..419W).
Fluxes were obtained for AGN and unidentified sources assuming a power
law spectrum with Fν ∝ ν-1. The flux for sources
identified as stars was calculated assuming a Raymond-Smith model with
a temperature of 2x106K and no correction for Galactic hydrogen
column density.
Note (4): Defined as the ratio SKing/Spoint.
Note (5): The letter indicates the band of the optical image(s) obtained.
Note (6): Y = spectra were taken for the source.
Note (7): Identifications in lower case were identified based on the
literature (primarily using NED and SIMBAD) while upper case IDs are
based on WARPS optical follow-up observations. Sources listed as
blends are briefly discussed in the notes column.
Note (8): Flags on redshift:
: = uncertain redshift;
] = redshift estimated photometrically.
p = modified in proof (see "History" section below)
Each individual case is explained in Section 4.4.
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Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [WARP]
5- 16 A12 --- WARPS Assigned source name, JHHMM.m+DDMM
18- 19 I2 h RAh ROSAT Hour of Right Ascension (J2000)
21- 22 I2 min RAm ROSAT Minute of Right Ascension (J2000)
24- 27 F4.1 s RAs ROSAT Second of Right Ascension (J2000)
29 A1 --- DE- ROSAT Sign of the Declination (J2000)
30- 31 I2 deg DEd ROSAT Degree of Declination (J2000)
33- 34 I2 arcmin DEm ROSAT Arcminute of Declination (J2000)
36- 37 I2 arcsec DEs ROSAT Arcsecond of Declination (J2000)
39- 42 F4.2 --- Ext ? Extent parameter (1)
44- 47 F4.2 10+20/cm2 NH Galactic hydrogen column density from
Dickey & Lockman (1990ARA&A..28..215D 1990ARA&A..28..215D)
49- 53 F5.2 10-13mW/m2 Flux ? Unabsorbed 0.5-2.0 keV flux in units
of 10-13 erg/cm2/s (2)
55- 59 F5.2 [10+37W] LogL ? Log of the rest-frame 0.5-2.0 keV
luminosity in units of 1044 erg/s (3)
61- 65 F5.2 arcsec Rad ? Cluster core radius (4)
67- 71 F5.3 --- z ? Cluster redshift estimated photometrically
72 A1 --- u_z []:] Flag on z (5)
74- 75 I2 --- o_z ? Number galaxy redshifts to derive z
77- 78 A2 --- Flag Additional flags (6)
80-106 A27 --- Notes Other Name and additional notes (G1)
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Note (1): Defined as the ratio SKing/Spoint.
Note (2): For some clusters this flux may include a component from
contaminating sources (e.g., AGN).
See Section 2.1 for details for each cluster.
Note (3): Derived in the same manner as the Flux. Values of q0 = 0.5 and
H0 = 50 km/s/Mpc were assumed.
Note (4): Note that this is very crude as it is based on ROSAT data which in
most cases barely resolve the cluster.
Note (5): Flags on redshift:
: = uncertain redshift;
] = redshift estimated photometrically.
Each individual case is explained in Section 4.4.
Note (6): Additional flags:
c: cluster is contaminated or possibly contaminated by other sources
<: cluster flux falls below the limit for inclusion in the
statistically complete, flux-limited sample
?: possible cluster or group for which optical follow-up was not
completed, usually because it was below the flux limit
9: cluster was found in a field targeted at another cluster
b: field was dropped due to high background
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- [PHJ2002] Assigned source name,
[PHJ2002] WARP JHHMM.m+DDMM RN
21- 22 I2 h RAh NVSS or FIRST Hour of Right Ascension (J2000)
(NVSS, 1998AJ....115.1693C 1998AJ....115.1693C, FIRST, VIII/59)
24- 25 I2 min RAm NVSS or FIRST Minute of Right Ascension (J2000)
27- 31 F5.2 s RAs NVSS or FIRST Second of Right Ascension (J2000)
33 A1 --- DE- NVSS or FIRST Sign of the Declination (J2000)
34- 35 I2 deg DEd NVSS or FIRST Degree of Declination (J2000)
37- 38 I2 arcmin DEm NVSS or FIRST Arcminute of Declination (J2000)
40- 43 F4.1 arcsec DEs NVSS or FIRST Arcsecond of Declination (J2000)
45- 46 I2 arcsec PosErr Positional error
48- 50 I3 arcsec Dist Distance from the X-ray centroid
52- 56 F5.2 mJy Flux Flux of all radio sources within 2' of the
X-ray centroid of the cluster
58- 96 A39 --- Com Information regarding the possible nature of
the radio source
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Global notes:
Note (G1):
Sources listed as SHARC appear in the SHARC Bright Survey catalog
(Romer et al., 2000, Cat. J/ApJS/126/209).
Sources listed as VMF correspond to sources in the CfA 160deg2
survey of Vikhlinin et al. (1998ApJ...498L..21V 1998ApJ...498L..21V).
Sources listed as RIXOS correspond to sources in the RIXOS survey
catalog (Mason et al., 2000, Cat. J/MNRAS/311/456).
NVSS (Condon et al., 1998AJ....115.1693C 1998AJ....115.1693C, Cat. VIII/65) and
FIRST (e.g., White et al., 1997, See Cat. VIII/59) radio sources
are also indicated.
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History:
* 04-Jun-2002: From electronic version of the journal
* 24-Aug-2007: Reshift of WARPS J1415.1+3612 (table2, rec#81)
corrected to 1.013 (note added in proof)
References:
Scharf et al., Paper I 1997ApJ...477...79S 1997ApJ...477...79S
Jones et al., Paper II 1998ApJ...495..100J 1998ApJ...495..100J
Ebeling et al., Paper III 2000ApJ...534..133E 2000ApJ...534..133E
Fairley et al., Paper IV 2000MNRAS.315..669F 2000MNRAS.315..669F
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 04-Jun-2002