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VII/54      Extragalactic Radio Source Identifications       (Veron-Cetty+ 1983)
================================================================================
A Catalogue of Extragalactic Radio Source Identifications
    Veron-Cetty M.-P., Veron P.
    <Astron. Astrophys. Suppl., 53, 219 (1983)>
    =1983A&AS...53..219V
================================================================================
ADC_Keywords: Radio sources; Galaxies, radio; Galaxy catalogs

Description:
   The catalog is a compilation of all published optical identifications of
   extragalactic radio sources.  This machine-readable version is an updated
   and greatly expanded edition of the original published one;
   this version contains 14585 identifications and citations to 917 papers.
   The data file contains most commonly used source name, number in the 4C
   catalog Gower et al. (1967), and Pilkington and Scott (1965) if applicable,
   right ascension and declination (equinox B1950.0), magnitude estimate for
   the identification type of optical object, identification reference,
   alternate name for identified object (if known), confirmation or
   invalidation code and associated reference, finding chart existence (or
   nonexistence), redshift, and reference for the spectrum.
  
   A reference file contains the references ordered by number cited in the
   catalog and alphabetically by author.  Completeness has been attempted for
   all papers published through the end of 1982.  The present version contains
   fewer references than the 1974 version (which had 935) because certain
   numbers were unused in the previous edition and because certain references
   are no longer used in the 1983 version and were removed.  The authors have
   prepared this final version and have discontinued future updates.

Introduction:
 Abbreviations used in the catalog for optical and radio designations are given
 in Tables I and II of Veron-Cetty and Veron (1983) but are repeated here 
 for convenience.  The references cited are given in the machine-readable 
 "refs.dat" file.

Table I.  Abbreviations and References for the Optical Designations
   -----------------------------------------------------------------
   Abbreviation(s)   Reference(s)
   -----------------------------------------------------------------
    A               Abell's clusters of galaxies (Abell 1958).
    M               Messier Catalogue.
    NGC, IC         Dreyer (1888, 1895, and 1908).
    VV              Vorontsov-Velyaminov (1959).
    ZW, ZW, CL      Zwicky et al. (1961).
    AKN             Arakelian (1975).
    B               Braccesi et al. (1970).
    LB              Luyten blue star (Luyten 1962).
    MARK            Markarian (1967, 1969a and b); Markarian and Lipovetski
                    (1971,1972, 1973, 1974, 1976a and b); Markarian et al.
                    (1977a and b, 1979a and b, 1981).
    PB              Berger and Fringant (1977, 1980).
    PG              Schmidt and Green (1983).
    PHL             Palomar Haro-Luyten Object (Haro and Luyten 1962).
    POX             Kunth et al. (1981).
    TON             Iriarte and Chavira (1957); Chavira (1958 and 1959).
   -----------------------------------------------------------------

Table II.  Abbreviations and References for the Radio Designations
   -----------------------------------------------------------------
   Abbreviation(s)   Reference(s)
   -----------------------------------------------------------------
    AO              Arecibo Occultation (Hazard et al. 1967; Hazard et al. 1968;
                    Gulkis et al. 1969; Lang et al. 1970).
    BDA             Blum and Davis (1968).
    B1              Braccesi et al. (1965).
    B2              The B2 Catalogue of radio sources (Colla et al. 1970, 1972
                    and 1973).
    CTA             CalTech list A (Harris and Roberts 1960).
    CTD             CalTech list D (Kellermann and Read 1965).
    DA              Galt and Kennedy (1968).
    DW              Davis (1967)
    GC              Browne et al. (1973).
    MSH             Mills et al. (1958, 1960, and 1961).
    NB              Branson (1967).
    NRAO            Pauliny-Toth et al. (1966).
    O               Ohio catalogue of radio sources (Scheer and Kraus 1967;
                    Dixon and Kraus 1968; Fitch et al. 1969; Ehman et al. 1970;
                    Brundage et al. 1971; Kraus and Andrew 1971).
    OTL             Ooty radio sources (Kapahi et al. 1973a and b).
    PKS             Parkes catalogue of radio sources (CSIRO Staff 1969; Wall
                    et al. 1971).
    RN              Ryle and Neville (1962).
    VRO             Vermilion River Observatory catalogue of radio sources
                    ( McLeod et al. 1965; Dickel et al. 1967; Wendker et al.
                    1970; Dickel et al. 1971).
    WK              Windram and Kenderdine (1969).
    WKB             Williams et al.(1966).
    3C              Third Catalogue of Cambridge (Edge et al. 1959; Bennet 1962;
                    Windram and Kenderdine 1969).
    4C              Fourth Catalogue of Cambridge (Pilkington and Scott 1965;
                    Gower et al. 1967; Caswell and Crowther 1969).
    5C              Fifth Cambridge Catalogue (Pooley and Kenderdine 1968;
                    Pooley 1969; Wilson 1970).
   -----------------------------------------------------------------
 Note on Table II:
    Some sources appear with a Parkes-like number without any catalog number.
    They come from: Hoskins et al. (1972); Fanti et al. (1973); Baldwin et al. 
    (1973); Douglas et al. (1973), Ghigo and Owen (1973); Sharp and Bash (1975).
  
File Summary:                                                                  
-------------------------------------------------------------------------------
 FileName    Lrecl    Records    Explanations                                  
-------------------------------------------------------------------------------
ReadMe          80          .    This file
main.dat        80      14585    The catalogue 
refs.dat        80       1244    References 
--------------------------------------------------------------------------------

Byte-by-byte Description of file: main.dat
--------------------------------------------------------------------------------
   Bytes Format  Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 12  A12    ---     Name     *Identification of the source.
  13- 18  A6     ---     4C       *ID number of source in 4C
  20- 21  I2     h       RAh      *Right ascension, hours, equinox 1950.0
  23- 24  I2     min     RAm       Right Ascension, minutes
  26- 29  F4.1   s       RAs       Right Ascension, seconds
      30  A1     ---     DE-       Sign of declination, equinox 1950.0
  31- 32  I2     deg     DEd       Declination, degrees
  34- 35  I2     arcmin  DEm       Declination, arcminutes
  37- 38  I2     arcsec  DEs       Declination, arcseconds
  40- 44  F5.2   mag     mag      *? Magnitude estimate for the identification
  46- 47  A2     ---     Nature   *Nature of proposed identification
  49- 51  I3     ---     r_Oname   Reference for identification
  52- 61  A10    ---     Oname     Optical name for the identification (Table I)
  62- 63  A2     ---     Conf     *Code, confirmation or invalidation of ident.
  64- 66  I3     ---     r_Conf    Reference for Conf
      67  I1     ---     FCnum    *? Running number for proposed identification
      68  I1     ---     Added    *? Code for additions made to the catalog
  69- 73  F5.3   ---     z         ? Redshift of ident. (precision varies)
  74- 76  A3     ---     n_z      *Note for unknown z
  77- 79  I3     ---     ref      *Reference for the spectrum
      80  A1     ---     n_Nature *Remark on Nature 
--------------------------------------------------------------------------------
Note on Name:
  The most common name is used. Abbreviations and references for the radio 
    designations are given in Table II.

Note on 4C:
  Fourth Cambridge Radio Survey Catalogue (4C)
  (Pilkington and Scott 1965; Gower, Scott and Wills 1967).

Note on RAh:
  The position given in the source publication is generally used without any 
    attempt to report the best available position; therefore, the positions 
    can differ for the same source as taken from various references.

Note on mag:
  Magnitude estimate for the identification of the source as given in the 
    reference. Data are inhomogeneous and generally only rough estimates; 
    hence, caution is advised in their use. Magnitudes are reported to
    varying precision.

Note on Nature:
  Letter code indicating the nature of the proposed identification. The codes 
    are defined below. When this field is blank, a finding chart has been 
    published, but no identification proposed.

            Codes for Nature of the Proposed Identification
  ------------------------------------------------------------------------
  Code      Type of Object
  ------------------------------------------------------------------------
  B         Appears only for reference 319: should be interpreted as Q.
  EF        Empty field.
  G         Galaxy.  The type has not been retained, even if suggested in the
              reference.
  H2        H II region.
  OF        Obscured field
  Q         Quasi-stellar object.  Includes all related suggested
              identifications, such as quasars, stellar object, neutral
              object,....

Note on Conf:
  * : subsequent spectrum showed that proposed identification is a star.
  Q : subsequent spectrum showed that proposed identification is really a QSO 
        (quasar).
  W : identification was discarded on the basis of a better radio or optical 
        position.
  OK: identification was confirmed by means of accurate radio and optical 
        positions; or, in the case of a quasar, by measuring its UBV color
        photoelectrically.
  EF: proposed identification was discarded and the field shown to be empty, 
        or the preceding classification as an empty field was confirmed.
  OF: proposed identification was discarded and the field shown to be obscured.

Note on FCnum:
  If several finding charts have been published for the same source, and if 
    these identifications are not confirmed, a running number for each proposed
    identification is given; if two records have the same number in this field,
    then the two proposed identifications are identical.

Note on Added:
  blank if in original published catalog
  1, 2,... if added in 1974, 1975, ...

Note on n_z:
  OK indicates that the spectrum is continuous. Other indications
    (e.g. *?, *, Q?) can appear here.

Note on ref:
  If this field is not blank when the redshift field (bytes 69-73) is,
    then the spectrum is inconclusive.

Note on n_Nature:
  An asterisk (*) is present when bytes 46-47 contain "EF" and there is no 
    published finding chart.

Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
   Bytes Format  Units   Label    Explanations
--------------------------------------------------------------------------------
   1-  3  I3     ---     Number   ? Reference number cited in the data file
       4  A1     ---     Cont     [*]? * = continued from previous record
   5- 80  A76    ---     text     Reference or reference continuation.
--------------------------------------------------------------------------------

Acknowledgements:
   The documentation was essentially written by Wayne H. Warren Jr.,
   and exists as document NSSDC/WDC-A-R&S 83-12, National Space Science Data 
   Center (NSSDC)/World Data Center A for Rockets and Satellites (WDC-A-R&S),
   National Aeronautics and Space Administration, Goddard Space Flight Center,
   Greenbelt, Maryland  20771, November 1983). This ReadMe file is based on the
   above and on an Intro by CDS (19-Jun-1993).

   CDS thanks L. S. Fischer for supplying a preliminary version of the catalog 
   on magnetic tape and M. P. Veron-Cetty for supplying a magnetic tape of the 
   final version, and for supplying new code definitions for codes which had 
   been added since the 1974 version.

References:
   Gower J.F.R., Scott P.F. and Wills D. 1967, Mem. R. Astron. Soc. 71, 49.
   Pilkington J.D.H. and Scott P.F. 1965, Mem. Roy. Astron. Soc. 69, 183.
   Veron M.P. and Veron P. 1974, Astron. Astrophys. Suppl. 18, 229.
   Veron-Cetty M.P. and Veron P. 1983, Astron. Astrophys. Suppl. 53, 219.
================================================================================
(End) [CDS] 19-Jun-1993  (Julie Anne Watko [SSDOO/ADC])              07-May-1996

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