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Detailed Description of J/ApJ/502/558 : Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)
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Note : this is the description file of the original catalog.
This HTML page corresponds well to the original description, but some minor
changes in the format may have been introduced in the FITS output
files in order to allow for arithmetic operations on quantities
such as coordinates and times. h:m:s and d:m:s units are normally
converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the
units; the value given in the HTML files supersedes the value indicated in the ReadMe
file for this catalogue.
J/ApJ/502/558 Catalog of ROSAT galaxy clusters (Vikhlinin+ 1998)
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A catalog of 200 galaxy clusters serendipitously detected in the
ROSAT PSPC pointed observations.
Vikhlinin A., McNamara B.R., Forman W., Jones C., Quintana H.,
Hornstrup A.
<Astrophys. J. 502, 558 (1998)>
=1998ApJ...502..558V
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ADC_Keywords: Clusters, galaxy ; X-ray sources ; Redshifts
Mission_Name: ROSAT
Keywords: catalogs - galaxies: clusters: general - surveys - X-rays: galaxies
Abstract:
We present a catalog of 203 clusters of galaxies serendipitously
detected in 647 ROSAT PSPC high Galactic latitude pointings covering
158deg2. This is one of the largest X-ray-selected cluster samples,
comparable in size only to the ROSAT All-Sky Survey sample of nearby
clusters (Ebeling et al., 1997ApJ...479L.101E). We detect clusters in
the inner 175 of the ROSAT PSPC field of view using the spatial extent
of their X-ray emission. Fluxes of detected clusters range from
1.6x10-14 to 8x10-12ergs/s/cm2 in the 0.52keV energy band. X-ray
luminosities range from 1042ergs/s, corresponding to very poor
groups, to ~5x1044ergs/s, corresponding to rich clusters. The
cluster redshifts range from z=0.015 to z>0.5. The catalog lists X-ray
fluxes, core radii, and spectroscopic redshifts for 73 clusters and
photometric redshifts for the remainder.
File Summary:
FileName Lrecl Records Explanations
× 80 . This file
× ReadMe 80 . This file
× table3.dat 67 223 Cluster catalog
× notes.dat 79 41 Notes to table3.dat
See also:
IX/11 : ROSAT Source Catalog (Voges+ 1994)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [VMF98] Sequential number
5- 6 I2 h RAh X-ray centroid right ascension (J2000)
8- 9 I2 min RAm X-ray centroid right ascension (J2000)
11- 14 F4.1 s RAs X-ray centroid right ascension (J2000)
16 A1 --- DE- X-ray centroid declination sign (J2000)
17- 18 I2 deg DEd X-ray centroid declination (J2000)
20- 21 I2 arcmin DEm X-ray centroid declination (J2000)
23- 24 I2 arcsec DEs X-ray centroid declination (J2000)
26- 30 F5.1 10-17W/m2 FX Total unabsorbed X-ray flux in the 0.5-2keV
energy band (in 10-14erg/s/cm2)
32- 35 F4.1 10-17W/m2 e_FX rms uncertainty on FX
37- 39 I3 arcsec Rc Angular core radius
41- 42 I2 arcsec e_Rc rms uncertainty on Rc
44- 48 F5.3 --- z ? Heliocentric spectroscopic or photometric
redshift (1)
50- 53 F4.2 --- zmin ? Photometric redshift 90% confidence interval
54 A1 --- --- [-]
55- 58 F4.2 --- zmax ? Photometric redshift 90% confidence interval
59- 61 A3 --- n_zmax [dss ] dss: Digited Sky Survey redshift
63- 64 I2 arcsec errPos 90% X-ray position error circle
65 A1 --- detFlag [UF] Uncertain or False detections (2)
66- 67 I2 --- Note ? Note detailed in file "notes.dat"
Note (1): If the redshift is spectroscopic, no error interval is given
Note (2): the 'U' flag is set for clusters
that show clear concentrations of galaxies near the X-ray position,
but the choice of BCG is uncertain because of the large cluster
angular size. No photometric redshift are given.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Note Note number
4- 79 A76 --- Text Text of the note
History: From ApJ electronic version
* 18-Dec-2001: Thanks to checks by Stephen A. Drake
(drake@olegacy.gsfc.nasa.gov), the flux units have corrected.
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(End) James Marcout, Patricia Bauer [CDS] 22-Sep-1998