An image database. I. Automatic construction of a catalog of galaxies.

Details An image database. I. Automatic construction of a catalog of galaxies. An image database. I. Automatic construction of a catalog of galaxies.

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...311...12p&link_type=abstract

Astronomy and Astrophysics, v.311, p.12-20

Astronomy and Astrophysics

Astrophysics

8

Galaxies: General, Catalog, Galaxies: Photometry

Scientific paper

0The free access LEDA extragalactic database is managing 35,841 images obtained by direct digitization of the Palomar Sky Survey between δ=-33deg and δ=85deg. These images are used to identify galaxies present in the LEDA database and to obtain their accurate coordinates using the Guide Star Catalog as a reference. The nominal accuracy is about 3 arcsec.. This is about half the pixel resolution and sufficient for galaxy identification. A first extraction of 68,040 galaxies is performed. For each galaxy, the basic photometric parameters are obtained: coordinates, diameter, axis ratio, total magnitude, position angle. The procedure which is described here is a first step towards automatic catalog construction.

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