ACDS V10.0 - Detailed Description of VII/237

ACDS V10.0 - Sun Jan 19 06:16:15 CET 2025

| # Detailed Description of VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003) |

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.

    VII/237             HYPERLEDA. I. Catalog of galaxies        (Paturel+, 2003)
    ================================================================================
    HYPERLEDA. I. Identification and designation of galaxies.
        Paturel G., Petit C., Prugniel P., Theureau G., Rousseau J., Brouty M.,
        Dubois P., Cambresy L.
       <Astron. Astrophys. 412, 45 (2003)>
       =2003A&A...412...45P
    ================================================================================
    ADC_Keywords: Galaxy catalogs

    Keywords: galaxies: general - catalogs

    Abstract:
        We present the new catalog of principal galaxies (PGC2003). It
        constitutes the framework of the HYPERLEDA database that supersedes
        the LEDA one, with more data and more capabilities. The catalog is
        still restricted to confirmed galaxies, i.e. about one million
        galaxies, brighter than ~18B-mag.

        In order to provide the best possible identification for each galaxy
        we give: accurate coordinates (typical accuracy better than 2 arcsec),
        diameter, axis ratio and position angle. Diameters and axis ratios
        have been homogenized to the RC2 system at the limiting surface
        brightness of 25B-mag/arcsec2, using a new method, the EPIDEMIC
        method.

        In order to provide the best designation for each galaxy, we collected
        the names from 50 catalogues. The compatibility of the spelling is
        tested against NED and SIMBAD, and, as far as possible we used a
        spelling compatible with both. For some cases, where no consensus
        exists between NED, SIMBAD and LEDA, we propose some changes that
        could make the spelling of names fully compatible.

        The full catalog is distributed through the CDS and can be extracted
        from HYPERLEDA, http://leda.univ-lyon1.fr/ .

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × pgc.dat          342   983261   Catalog of galaxies (table 5 in the paper)
    × accro.dat         82       50   Table of adopted acronyms (table 2 in the paper)

    See also:
        http://leda.univ-lyon1.fr/ : the Hyperleda Home Page
        VII/238 : HYPERLEDA. II. Catalog of homogenized HI data (Paturel+, 2003)

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

       Bytes Format Units        Label   Explanations

       1-  3  A3    ---          ---     [PCG]
       4- 10  I7    ---          PGC     [1/3099300] PGC number
          12  A1    ---          ---     [J]
      13- 14  I2    h            RAh     Right ascension (J2000)
      15- 16  I2    min          RAm     Right ascension (J2000)
      17- 20  F4.1  s            RAs     Right ascension (J2000)
          21  A1    ---          DE-     Declination sign (J2000)
      22- 23  I2    deg          DEd     Declination (J2000)
      24- 25  I2    arcmin       DEm     Declination (J2000)
      26- 27  I2    arcsec       DEs     Declination (J2000)
      29- 30  A2    ---          OType   [GM ] Object type (1)
      32- 36  A5    ---          MType   Provisional morphological type from LEDA
                                          according to the RC2 code.
      37- 41  F5.2  [0.1arcmin]  logD25  ?=9.99 Apparent diameter (2)
      42- 44  A3    ---          ---     [±]
      45- 48  F4.2  [0.1arcmin] e_logD25  ?=9.99 Actual error of logD25
      51- 54  F4.2  [---]        logR25  ?=9.99 Axis ratio in log scale
                                           (log of major axis to minor axis)
      55- 57  A3    ---          ---     [±]
      58- 61  F4.2  [---]      e_logR25  ?=9.99 Actual error on logR25
      64- 67  F4.0  deg          PA      ?=999. Adopted 1950-position angle (3)
      68- 70  A3    ---          ---     [±]
      71- 74  F4.0  deg          e_PA    ?=999. rms uncertainty on PA
      76- 77  I2    ---        o_ANames  Number of alternate names.
      79-341  A263  ---          ANames  Alternate names (4)

    Note (1): 'G', galaxies; 'M', multiple system; GM, galaxy in multiple system.

    Note (2): Apparent diameter in log scale (D in 0.1arcmin) converted to the
        RC3 system at the isophote 25B-mag/arcsec2 (section 3);
    Note (3): Adopted 1950-position angle, measured from the North to the East.
        Its value covers the range 0-180. A few values exactly equal to zero
        are taken as 180.
    Note (4): Alternate names following the hierarchy given in accro.dat file.
        Up to 12 names, each 22 bytes long, is given here.
        Names that correspond to a multiple system are written in parenthesis.
        151 Names that do not agree with NED identification have been written
        with a question mark (?). 677 names that have been moved from one
        galaxy to another since the first catalog have been written with an
        exclamation point (!).

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

       Bytes Format Units   Label     Explanations

       1- 23  A23   ---     Name      Example of the name (1)
      25- 51  A27   ---     Aut       Authors' name
      53- 82  A30   ----    Ref       BibCode or catalog number

    Note (1): For each adopted acronym we give an example of a name and the
        reference where the acronym was created. When an acronym comes from
        several references (e.g., KUG), we give the latest reference that
        lists the former ones.

    Acknowledgements: Georges Paturel patu@obs.univ-lyon1.fr

    ================================================================================
    (End)                                        Patricia Bauer [CDS]    28-Nov-2003