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

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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/519/533   ROSAT observations of ACO clusters     (David+, 1999)
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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) ================================================================================ (End) Greg Schwarz [AAS] 08-Mar-2000