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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)
================================================================================
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
================================================================================
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. ================================================================================ (End) James Marcout, Patricia Bauer [CDS] 22-Sep-1998