ACDS V10.0 - Detailed Description of J/ApJ/519/533

ACDS V10.0 - Mon Feb 03 14:40:01 CET 2025

| # Detailed Description of J/ApJ/519/533 : ROSAT observations of ACO clusters (David+, 1999) |

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/519/533   ROSAT observations of ACO clusters     (David+, 1999)
    ================================================================================
    ROSAT PSPC observations of the richest (R>=2) ACO clusters
          David L.P., Forman W., Jones C.
         <Astrophys. J. 519, 533 (1999)>
         =1999ApJ...519..533D
    ================================================================================
    ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; X-ray sources

    Mission_Name: ROSAT

    Keywords: catalogs - galaxies: clusters: general - surveys - X-rays: galaxies

    Abstract:
        We have compiled an X-ray catalog of optically selected rich clusters
        of galaxies observed by the Position Sensitive Proportional Counter
        (PSPC) during the pointed GO phase of the ROSAT mission. This paper
        contains a systematic X-ray analysis of 150 clusters with an optical
        richness classification of R>=2 from the Abell, Corwin, & Olowin
        (1989; ACO) catalog. All clusters were observed within 45' of the
        optical axis of the telescope during pointed PSPC observations. For
        each cluster, we calculate: the net 0.5-2.0keV PSPC count rate (or
        4{sigma} upper limit) in a 1Mpc radius aperture, 0.5-2.0keV flux
        and luminosity, bolometric luminosity, and X-ray centroid. The cluster
        sample is then used to examine correlations between the X-ray and
        optical properties of clusters, derive the X-ray luminosity function
        of clusters with different optical classifications, and obtain a
        quantitative estimate of contamination (i.e., the fraction of clusters
        with an optical richness significantly overestimated due to
        interloping galaxies) in the ACO catalog.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table1.dat       111      153   ROSAT PSPC ACO Cluster sample

    See also:
             VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
       J/A+A/278/379 : X-ray Emission from Abell Clusters of Galaxies (Briel+ 1993)
       J/ApJS/56/403 : X-ray survey of clusters of galaxies. IV. (Kowalski+, 1984)

    Byte-by-byte Description of file:  table1.dat

       Bytes Format Units   Label     Explanations

       1-  9  A9    ---     ACO       Abell, Corwin & Olowin (1989, Cat. VII/110)
                                       Cluster name
      12- 13  I2    h       RAh       ? Right Ascension (J2000) of X-ray centroid
      15- 16  I2    min     RAm       ? Right Ascension (J2000) of X-ray centroid
      18- 21  F4.1  s       RAs       ? Right Ascension (J2000) of X-ray centroid
          24  A1    ---     DE-       ? Declination (J2000) of X-ray centroid
      25- 26  I2    deg     DEd       ? Declination (J2000) of X-ray centroid
      28- 29  I2    arcmin  DEm       ? Declination (J2000) of X-ray centroid
      31- 34  F4.1  arcsec  DEs       ? Declination (J2000) of X-ray centroid
      36- 38  I3    ---     Ngal      Number of cluster members
      40- 47  A8    ---     BMType    Bautz-Morgan type
      51- 55  F5.3  ---     z         Redshift
          57  A1    ---     f_z       [z] Indicates redshifts estimated by the
                                       method in Ebeling+ (1998MNRAS.301..881E)
          59  I1    ---     f_ACO     [1,2] Indicates type of observation (1)
      61- 65  I5    s       Time      Screened integration time
          67  A1    ---     l_CtRate  Limit flag on CtRate
      68- 74  F7.4  ct/s    CtRate    PSPC count rate or 4{sigma} upper limit
                                       from 0.5-2keV
      76- 81  F6.4  ct/s    e_CtRate  Uncertainty (1{sigma}) in CtRate
          83  A1    ---     l_UFlux   Limit flag on UFlux
      84- 91  E8.2  mW/m2   UFlux     Unabsorbed X-ray flux from 0.5-2keV
                                       (ergs/cm2/s)
          93  A1    ---     l_Lum     Limit flag on Lum
      94-101  E8.3  10-7W   Lum       Rest-frame X-ray luminosity from 0.5-2keV
                                       in ergs/s (2)
         103  A1    ---     l_Lbol    Limit flag on Bolo
     104-111  E8.3  10-7W   Lbol      Rest-frame Bolometric luminosity in ergs/s (2)

    Note (1):
        1 = cluster was part of a targeted observation
        2 = was observed serendipitously
    Note (2): All distance-dependent quantities are computed assuming
              H0=50km/s/Mpc and q0=0.5.

    History:
        From ApJ electronic edition

    References:
        Abell, G. O., Corwin, H. G., & Olowin, R. P. 1989, ApJS, 70, 1
          (1989ApJS...70....1A, Cat. VII/110)
        Ebeling, H., Edge, A. C., Boehringer, H., Allen, S. W., Crawford,
          C. S., Fabian, A. C., Voges, W., & Huchra, J. P. 1998, MNRAS,
          301, 881 (1998MNRAS.301..881E, Cat. J/MNRAS/301/881)
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    (End)                                          Greg Schwarz [AAS]    08-Mar-2000