Astronomical Data Center

ADCADC/CDS Standard Document for Catalog:
/catalogs/7/7149/

The following is the "ReadMe" document that describes this ADC catalog.

This catalog does not currently have a complete standard document. The ADC data viewer will not work for catalogs without standard documents.

You can access the files described here from the anonymous FTP directory:
   ftp://adc.astro.umd.edu/pub/adc/archives/catalogs/7/7149/. 

VII/149  Accurate Pos 528 Hi-Z, Lum QSO's HST Snap-Shot Survey (Schneider+1992)
================================================================================
Accurate Positions of 528 High-Redshift, Luminous Quasars from the HST Snap-Shot
Survey
    Schneider D.P., Bahcall J.N., Saxe D.H., Bahcall N.A., Doxsey R.,
    Golombek D., Krist J., McMaster M., Meakes M., Lahav O.
    <PASP, 104, 678 (1992)>
================================================================================
ADC_Keywords: Positional data ; QSOs ; Redshifts ; Surveys

Description:
   The non-proprietary HST Snapshot Survey produced Planetary Camera images of
   high-redshift, luminous quasars.  The aim of the program is to determine
   the frequency of multiple imaged QSOs down to angular scales of 0.15 s.
   Detailed descriptions of the program are given in Bachall et al. (1992) and
   Maoz et al. (1992).  The sample was taken from the 3rd and 4th editions of
   the catalog of Veron-Cetty and Veron (1987, 1989).  The target positions
   taken from these catalogs were fed to GASP, the STSci Guide Star
   Astrometric Support Program, to generate revised positions from regions
   extracted from the STSci's digitized sky survey.
   The printed version of the catalog does not contain the Veron 1950
   coordinates nor the difference between these and the GASP derived 1950
   coordinates that are contained in this version.
  
References:
   Bachall, J.N., Maoz, D., Doxsey, R., Schneider, D.P., Bachall, N.A.,
      Lahav, O., and Yanny, B. 1992, ApJ, 387, 56
   Maoz, D., Bachall, J.N., Doxsey, R., Schneider, D.P., Bachall, N.A.,
      Lahav, O., and Yanny, B. 1992, ApJ, 394, 51
   Veron-Cetty, M.P., and Veron, P. 1987," A Catalog of Quasars and Active
      Nuclei, 3rd Edition", ESO Scientific Report No. 5, Munich
   Veron-Cetty, M.P., and Veron, P. 1989, A Catalog of Quasars and Active
      Nuclei, 4th Edition", ESO Scientific Report No. 7, Munich

File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
doc_01             80       81   Intro
data_01.dat       124      528   catalog
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Byte-by-byte Description of file: data_01.dat
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   Bytes Format  Units   Label    Explanations
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   1-  n  In     ---     ---      ---
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(End)                                 Gail L. Schneider [SSDOO/ADC]  25-Sep-1995
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