The Steward Alerts for Science System (SASSy) provides access to various alerts and cross-correlation with catalogs. We provide support for queries to alerts and database(s) sourced from the Galaxy List for the Advanced Detector Era (GLADE), the Gravitational Wave Galaxy Catalog (GWGC), (ad-hoc) alerts from the Laser Interferometer Gravitational-Wave Observatory (LIGO), the Transient Name Server (TNS) and the Zwicky Transient Facility (ZTF). Further information is available in the (help) and (api) sections.

These pages are adapted from the code from LCOGT (Las Cumbres Observatory Global Telescope) which delivers the MARS (Make Alerts Really Simple) website.

Gravitational Wave Galaxy Catalog (gwgc.dat.gz) Description


VII/267             Gravitational Wave Galaxy Catalogue           (White+ 2011)
A List of Galaxies for Gravitational Wave Searches
      White D.J.,  Daw E.J., Dhillon V.S.
    <Class. Quantum Grav. 28, 085016 (2011); arXiv:1103.0695>
ADC_Keywords: Galaxy catalogs

    We present a list of galaxies within 100Mpc, which we call the
    Gravitational Wave Galaxy Catalogue (GWGC), that is currently being
    used in follow-up searches of electromagnetic counterparts from
    gravitational wave searches. Due to the time constraints of rapid
    follow-up, a locally available catalogue of reduced, homogenized data
    is required. To achieve this we used four existing catalogues: an
    updated version of the Tully Nearby Galaxy Catalog (cat. VII/145),
    145 the Catalog of Neighboring Galaxies (Karachentsev et al. 2004,
    Cat. J/AJ/127/2031), the V8k catalogue (Tully et al.
    2009AJ....138..323T, and HyperLEDA
    ( The GWGC contains information on sky
    position, distance, blue magnitude, major and minor diameters,
    position angle, and galaxy type for 53,255 galaxies. Errors on these
    quantities are either taken directly from the literature or estimated
    based on our understanding of the uncertainties associated with the
    measurement method. By using the PGC numbering system developed for
    HyperLEDA, the catalogue has a reduced level of degeneracies compared
    to catalogues with a similar purpose and is easily updated. We also
    include 150 Milky Way globular clusters. Finally, we compare the GWGC
    to previously used catalogues, and find the GWGC to be more complete
    within 100 Mpc due to our use of more up-to-date input catalogues and
    the fact that we have not made a blue luminosity cut.


File Summary:
 FileName  Lrecl  Records   Explanations
ReadMe        80        .   This file
gwgc.dat     148    53312   The Gravitational Wave Galaxy Catalogue

See also:
    VII/145 : Nearby Galaxies Catalogue (NBG) (Tully 1988)
    J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004) : The HYPERLEDA home page : The Extragalactic Distance Database (EDD)

Byte-by-byte Description of file: gwgc.dat
   Bytes Format Units    Label    Explanations
   1-  7  I7    ---      PGC      [2,4715229]? Identifier from HYPERLEDA
                                  (empty for globular clusters)
   9- 36  A28   ---      Name     Common name of galaxy or globular
  38- 46  F9.5  h        RAhour   Right ascension (J2000, decimal hours)
  48- 55  F8.4  deg      DEdeg    Declination (J2000)
  57- 60  F4.1  ---      TT       [-9,10]? Morphological type code (1)
  62- 66  F5.2  mag      Bmag     ? Apparent blue magnitude
  68- 74  F7.3  arcmin   a        ? Major diameter (arcmins)
  76- 82  F7.3  arcmin e_a        ? Error in major diameter (arcmins)
  84- 90  F7.3  arcmin   b        ? Minor diameter (arcmins)
  92- 98  F7.3  arcmin e_b        ? Error in minor diameter (arcmins)
 100-104  F5.3  ---      b/a      [0,1]? Ratio of minor to major diameters
 106-110  F5.3  ---    e_b/a      ? Error on ratio of minor to major diameters
 112-116  F5.1  deg      PA       [0,180]? Position angle of galaxy
                                    (degrees from north through east)
 118-123  F6.2  mag      BMAG     ? Absolute blue magnitude
 125-131  F7.2  Mpc      Dist     ? Distance (Mpc)
 133-138  F6.2  Mpc    e_Dist     ? error on Distance (Mpc)
 140-143  F4.2  mag    e_Bmag     ? error on Apparent blue magnitude
 145-148  F4.2  mag    e_BMAG     ? error on Absolute blue magnitude
Note (1): Numerical morphology type (-6 to +10 for ellipticals to irregular);
     -9 is assigned for the Milky Way globular clusters.

    Roy Williams (Caltech, USA), Darren White (U. Sheffield, UK)
(End)                                   Francois Ochsenbein [CDS]    11-Jan-2012