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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
    4σ 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

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 4σ upper limit
                                   from 0.5-2keV
  76- 81  F6.4  ct/s    e_CtRate  Uncertainty (1σ) 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)
(End)                                          Greg Schwarz [AAS]    08-Mar-2000