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J/ApJS/129/435           NORAS galaxy cluster survey. I.      (Bohringer+, 2000)
The northern ROSAT all-sky (NORAS) galaxy cluster survey. I.
X-ray properties of clusters detected as extended X-ray sources.
    Bohringer H., Voges W., Huchra J.P., McLean B., Giacconi R., Rosati P.,
    Burg R., Mader J., Schuecker P., Simic D., Komossa S., Reiprich T.H.,
    Retzlaff J., Trumper J.
   <Astrophys. J. Suppl. Ser. 129, 435 (2000)>
   =2000ApJS..129..435B
ADC_Keywords: Clusters, galaxy ; Surveys ; X-ray sources

Mission_Name: ROSAT

Keywords: galaxies: clusters: general - large-scale structure of universe -
          surveys - X-rays: galaxies

Abstract:
    In the construction of an X-ray-selected sample of galaxy clusters for
    cosmological studies, we have assembled a sample of 495 X-ray sources
    found to show extended X-ray emission in the first processing of the
    ROSAT All-Sky Survey. The sample covers the celestial region with
    declination δ≥0° and Galactic latitude |b|≥20° and
    comprises sources with a count rate ≥0.06counts/s and a source extent
    likelihood of L≥7. In an optical follow-up identification program we
    find 378 (76%) of these sources to be clusters of galaxies.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat       110      378   The NORAS Cluster X-Ray Source Catalog
table2.dat       101       99   The Noncluster X-Ray Sources among the Extended
                               RASS 1 Sources
table3.dat       101       18   The AGNs in Clusters and Noncluster Sources in the
                               Line of Sight with Probable Clusters
table4.dat        64       18   X-Ray Properties of the Noncluster X-Ray Source
                               Cluster Combinations
table5.dat        62      378   X-Ray Properties of the NORAS Cluster X-Ray Source
table6.dat       110       85   Additional ACO89 (Cat. VII/110) Clusters
                               Detected as X-Ray Sources in the 9h-14h Region
table7.dat        62       84   X-Ray Properties of the Additionally Found ACO89
                               Clusters
table8.dat       110       21   Additional Clusters Detected as Extended X-Ray
                               Sources in the 9h-14h Region
table9.dat        62       21   X-Ray Properties of the Additional Extended
                               Cluster Sources
refs.dat         151       81   Redshift references


See also:
    VII/110 : Rich Clusters of Galaxies (Abell+ 1989)
    IX/10   : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
    IX/29   : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)


Byte-by-byte Description of file: table1.dat table6.dat table8.dat

   Bytes Format Units      Label   Explanations

   1- 16  A16   ---        RXC     RXC designation (based on J2000 position)
  18- 32  A15   ---        Name    Alternative name
  33- 34  A2    ---        n_Name  Note on Name (1)
  36- 43  F8.4  deg        RAdeg   Right ascension (J2000.0)
  45- 52  F8.4  deg        DEdeg   Declination (J2000.0)
  54- 59  F6.4  ---        z       Redshift
  61- 65  F5.2  ct/s       CR      Count rate
  67- 72  F6.2  10-15W/m2  FX      X-ray flux
  74- 79  F6.2  10-15W/m2  FX*     Corrrected X-ray flux
  81- 85  F5.1  %          Error   Factional uncertainty for the count rate,
                                    the fluxes, and the luminosity
  87- 91  F5.2  10+37W     LX      Rest-frame X-ray luminosity of the clusters
                                    in the 0.1-2.4keV energy band (10+44erg/s)
  93- 96  F4.1  10+20cm-2  NH      Absorbing column density in the line of
                                    sight to the source
  98-100  A3    ---        ID      Identification flag (2)
 102-110  A9    ---        r_z     Redshift reference (separated by commas)
                                    in refs.dat file

Note (1): Individual notes are the following:
      a = See also Bade et al., 1998A&AS..127..145B
      b = See also Ebeling et al., 1998MNRAS.301..881E
      c = Barton et al., 1996AJ....112..871B
      d = Crawford et al., 1995MNRAS.274...75C
      e = Cooray et al., 1998AJ....115.1388C
      f = Struble & Rood, 1991ApJ...374..395S
      g = See also Tucker et al., 1995ApJ...444..532T
      h = Appenzeller et al., 1998ApJS..117..319A
      i = Wegner et al., 1996ApJS..106....1W
Note (2): Identification flag:
       ?: if the identification as a cluster leaves some residual doubts
       B: sources that have been deblended
       L: sources that have been analyzed in extra large fields
       C: sources that may be contaminated
     For the position we have used the coordinates determined by the
     moment method with a 3' aperture radius. As an exception, in the
     case of 12 cluster sources we have either chosen to redetermine the
     center position by a moment method with a larger aperture of 5' or
     7.5' or determined a center position by hand. In these sources the
     automatic detection has selected a maximum that is significantly
     offset from the global center of symmetry of the clusters.
       b: 5' moment method
       c: 7.5' moment method
       o: determination by eye


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Ref       Reference code
   4- 22  A19   ---     BibCode   Bibcode
  24- 56  A33   ---     Aut       Author's name
  58-151  A94   ---     Com       Comments


Byte-by-byte Description of file: table2.dat table3.dat

   Bytes Format Units   Label     Explanations

   1- 15  A15   ---     RXJ       RXJ designation (based on J2000 position)
  17- 23  A7    ---     Name      Alternative name
  25- 32  F8.4  deg     RAdeg     Right ascension (J2000.0)
  34- 41  F8.4  deg     DEdeg     Declination (J2000.0)
  43- 46  F4.2  ct/s    CR        Count rate
  48- 52  F5.2 10-15W/m2 FX       X-ray flux (in 10-12erg/s/cm2)
  54- 58  F5.2 10-15W/m2 FX*      Corrected X-ray flux
  60- 64  F5.2  %       Error     Factional uncertainty for the count rate,
                                  the fluxes, and the luminosity
  66- 69  F4.1  %       Pext      Extent parameter from the K-S test (1)
  71- 73  F3.1  arcmin  Rc        Best -fitting core radius
  75- 77  F3.1  arcmin  Rmin      Minimal radius value consistent with
                                  the 2σ uncertainty limit
  79- 83  F5.2  ---     HR        Hardness ratio
  85- 88  F4.2  ---     e_HR      rms uncertainty on HR
  90- 94  F5.2  ---     DHR       Deviation from the expected value of HR
                                  in units of σ
  96- 99  F4.1 10+20cm-2 NH       Interstellar H I column density
     101  A1    ---     ID        [cob] Alternative center determination flag (2)

Note (1): Probability result of the Kolmogorov-Smirnov test for the source
    to be a point source. For very low probabilities for the consistency
    with a point source the parameter Pext was limited to a value of 30
    for the entry in the table. A source is considered very likely to be
    extended if this parameter has at least a value of 2 (point source
    excluded with 99% probability).
Note (2): Alternative center determination:
       b: 5' moment method
       c: 7.5' moment method
       o: determination by eye


Byte-by-byte Description of file: table4.dat

   Bytes Format Units   Label     Explanations

   1- 15  A15   ---     RXJ       RXJ designation (based on J2000 position)
  17- 22  F6.4  ---     z         ? Redshift of AGN
  24- 64  A41   ---     Com       Comments


Byte-by-byte Description of file: table5.dat table7.dat table9.dat

   Bytes Format Units   Label     Explanations

   1- 16  A16   ---     RXC       RXC designation (based on J2000 position)
  18- 22  F5.2  10+37W  LX        Rest-frame ROSAT-band X-ray luminosity
  24- 27  F4.1  arcmin  RXang     Radius out to which the source count rate has
                                   been integrated, in arcmin
  29- 32  F4.2  Mpc     RXMpc     Radius out to which the source count rate has
                                   been integrated, in Mpc
  34- 37  F4.1  %       Pext      Extent parameter from the K-S test (1)
  39- 41  F3.1  arcmin  Rc        Best -fitting core radius
  43- 45  F3.1  arcmin  Rmin      Minimal radius value consistent with
                                  the 2σ uncertainty limit
  47- 51  F5.2  ---     HR        Hardness ratio
  53- 56  F4.2  ---     e_HR      rms uncertainty on HR
  58- 62  F5.2  ---     DHR       Deviation from the expected value of HR
                                  in units of σ

Note (1): Probability result of the Kolmogorov-Smirnov test for the source
    to be a point source. For very low probabilities for the consistency
    with a point source the parameter Pext was limited to a value of 30
    for the entry in the table. A source is considered very likely to be
    extended if this parameter has at least a value of 2 (point source
    excluded with 99% probability).


History:
  * 13-Nov-2000: From ApJS electronic version
  * 18-Jul-2005: (communicated by Steve Drake, HEASARC):
    -- Units corrected (for LX, Rc, Rmin) and RXC names
    -- RXC names: J0124.5+0145 in table1, 
                  J0108.1+0210 and J0114.9+0021 in table5
(End)                         James Marcout, Patricia Bauer [CDS]    13-Nov-2000