J/ApJS/140/239 RASS: clusters of galaxies around SGP (Cruddace+, 2002)
The ROSAT All-Sky Survey: a catalog of clusters of galaxies in a region of
1 steradian around the South Galactic Pole.
Cruddace R., Voges W., Bohringer H., Collins C.A., Romer A.K.,
MacGillivray H., Yentis D., Schuecker P., Ebeling H., de Grandi S.
<Astrophys. J. Suppl. Ser. 140, 239 (2002)>
=2002ApJS..140..239C 2002ApJS..140..239C
ADC_Keywords: Galaxy catalogs ; Clusters, galaxy ; X-ray sources ; Redshifts ;
Galactic pole, south
Keywords: catalogs - galaxies: clusters: general - X-rays: galaxies: clusters
Abstract:
A field of 1.013sr in the ROSAT All-Sky Survey (RASS), centered on the
south Galactic pole (SGP), has been searched in a systematic,
objective manner for clusters of galaxies. The procedure relied on a
correlation of the X-ray positions and properties of ROSAT sources in
the field with the distribution of galaxies in the COSMOS digitized
database, which was obtained from scanning the plates of the UK
Schmidt IIIa-J optical survey of the southern sky. The study used the
second ROSAT survey database (RASS-2) and included several optical
observing campaigns to measure cluster redshifts. The search, which is
a precursor to the larger REFLEX survey encompassing the whole
southern sky, reached the detection limits of both the RASS and the
COSMOS data and yielded a catalog of 186 clusters in which the lowest
flux is 1.5x10-12ergs/cm2/s in the 0.1-2.4keV band. Of these 157
have measured redshifts. Using a flux limit of 3.0x10-12ergs/cm2/s a
complete subset of 112 clusters was obtained, of which 110 have
measured redshifts. The spatial distribution of the X-ray clusters out
to a redshift of 0.15 shows an extension of the Local Supercluster to
the Pisces-Cetus supercluster (z<0.07), and an orthogonal structure at
higher redshift (0.07<z<0.15). This result is consistent with
large-scale structure suggested by optical surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 126 186 Catalog of clusters in the SGP
refs.dat 145 28 References
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
J/ApJ/514/148 : ROSAT survey of bright galaxies clusters (De Grandi+, 1999)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [RXC]
5- 16 A12 --- RXC ROSAT X-ray source name, JHHMM.m+DDMM
18- 19 I2 h RAh Hour of Right Ascension (J2000)
21- 22 I2 min RAm Minute of Right Ascension (J2000)
24- 27 F4.1 s RAs Second of Right Ascension (J2000)
29 A1 --- DE- Sign of the Declination (J2000)
30- 31 I2 deg DEd Degree of Declination (J2000)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000)
36- 37 I2 arcsec DEs Arcsecond of Declination (J2000)
39- 43 F5.3 ct/s Rate Hard band (0.5-2.0 keV) count rate
45- 49 F5.3 ct/s e_Rate Uncertainty in Rate
51- 54 F4.2 --- HR Hardness ratio (1)
56- 59 F4.2 --- e_HR Uncertainty in HR
61- 63 I3 s Exp ROSAT cluster survey exposure time
65- 68 F4.2 cm-2 ColDen Column density of interstellar atomic
hydrogen at the cluster center
70- 75 F6.3 keV Temp Temperature of the cluster gas (2)
77 A1 --- f_Temp [e] Flag on Temp (3)
79- 83 F5.2 10-12mW/m2 Flux The 0.1-2.4 keV energy flux from the cluster
in units of 10-12 erg/cm2/s (4)
85- 90 F6.3 10+37W Lum ? The 0.1-2.4 keV cluster luminosity in its
rest-frame in units of 1044 erg/s (5)
92-108 A17 --- ID Cluster optical identification (6)
110-115 F6.4 --- z ? Cluster redshift
117-121 A5 --- r_z Reference on z, in refs.dat file
123-125 A3 --- n_z Number of galaxy redshifts used in deriving
the cluster redshift
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Note (1): The hardness ratio is defined as (H-S)/(H+S) where H is the
count rate in the hard band (0.5 to 2.0keV) and S is the count rate in
the soft band (0.1 to 0.4keV).
Note (2): Derived by the procedure described in section 4 of the paper.
Note (3): Temperature flag:
e = Indicates that no measurement was found, and the temperature was
determined using an Lbol-T correlation. Where no redshift was
available a temperature of 5keV was assumed.
Note (4): With the absorption by galactic interstellar absorption removed.
In units of 10-12ergs/cm2/s.
Note (5): Derived using the procedure described in section 4.
We assume H0=50km/s/Mpc and q0=0.5.
Note (6): Cluster optical identification:
dc = source has been identified as a double-cluster.
Prefixes to the source optical identification:
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Prefix Source of Optical Identification Reference
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A Abell catalog Abell et al. 1989, Cat. VII/110
S Abell catalog: southern
supplementary clusters Abell et al. 1989, Cat. VII/110
AM Cambridge APM catalog NED: Arp & Madore 1987, Cat. VII/170
APMCC Cambridge APM cluster catalog Dalton et al., 1997,
Cat. J/MNRAS/289/263
CID EFAR survey Barton et al., 1996AJ....112..871B 1996AJ....112..871B
EDCC Edinburgh-Durham cluster catalog Lumsden et al., 1992, Cat. VII/175
EMSS Einstein medium sensitivity survey Stocke et al., 1991, Cat. IX/15
ESO European Southern Observatory No reference in NED
HCG Hickson compact group catalog Hickson, 1982, Cat. VII/213,
Barton et al., 1996AJ....112..871B 1996AJ....112..871B
SCG Catalog of COSMOS southern
compact groups Prandoni et al., 1994AJ....107.1235P 1994AJ....107.1235P
NGC Cluster dominated by NGC galaxy NED
SH Cluster catalog from
Shane-Wirtanen galaxy counts Shectman, 1985ApJS...57...77S 1985ApJS...57...77S
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 47 A24 --- Aut Author's name
49-148 A100 --- Com Comments
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 04-Jun-2002