Astronomical Data Center

ADCADC/CDS Standard Document for Catalog:
/external/hienergy/E9001/

The ADC has expanded its resources in order to better serve our users, we have developed a new category called "external" to complement our catalogs and journal table directories. You can access the data set described here through the URL:
http://www.hs.uni-hamburg.de/english/arbgeb/extgalqso/rosat/hrc.html.

The following is an abbreviated "ReadMe" document that describes this external data set.
E/IX/1     Hamburg/RASS Catalogue of Optical Identifications        (Bade+ 1998)
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Hamburg/RASS Catalogue of optical identifications, Version 2.0
    Bade N., Engels D., Voges W., Beckmann V., Boller T., Cordis L., Dahlem M.,
    Englhauser J., Molthagen K., Nass P., Studt J., Reimers D. 
    <Astron. Astrophys. Suppl. Ser., 127, 145 (1998)>
    =1998A&AS..127..145B
================================================================================
ADC_Keywords: X-ray sources; External catalog

Location: http://www.hs.uni-hamburg.de/english/arbgeb/extgalqso/rosat/hrc.html

Description:
    The Hamburg/RASS Catalogue of Optical Identifications (HRC) provides
    information on optical identifications to X-ray positions of the ROSAT 
    All-Sky Survey (RASS). The HRC is available via ftp-server at the URL
    ftp://ftp.hs.uni-hamburg.de/pub/outgoing/rass-id/. The main data file, 
    rass2id.cat, was created by correlating the Bright Source Catalogue of 
    ROSAT (Voges et al., 1996) and the Hamburg/RASS Catalogue of Optical 
    Identifications (HRC) (Bade et al., 1998). In the current state 
    (Version 2.0) the catalogue contains 4665 positions in the extragalactic 
    northern sky. For each X-ray position optical information taken from HQS
    objective prism and direct Schmidt plates (Hagen et al., 1995, A&AS 111,
    195) is given and a finding chart derived from digitized direct plates as 
    gzipped Postscript file is provided. If possible, the most likely optical
    counterpart is marked in the catalogue and on the finding chart. 
    For many of the newly processed HQS fields of Version 2.0 no direct
    Schmidt plates from the HQS exists. In these cases we put finding
    charts generated from the STScI Digitized Sky Survey on the ftp
    server. We remind the reader that the STScI Digitized Sky Survey and
    HQS prism plates have different epochs. This has to be taken into
    account for stellar identifications. Furthermore the spectral
    sensitivity of the  STScI Digitized Sky Survey and the HQS prism
    plates is different.

Historical notes:
       3-June-1999, by Gail L. Schneider: Updated location link.
  
References:
       Hagen et al., 1995, A&AS 111, 195  =1995A&AS..111..195H         
       Voges, W., et al. 1996 IAU Circ., 6420, 2 =1996IAUC.6420....2V
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(End) James E. Gass [SSDOO/ADC] Mod. by Gail L. Schneider [SSDOO/ADC] 9-Apr-1998
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