A&A Supplement series, Vol. 127, February I 1998, 367-395
Received February 25; accepted May 22, 1997
C.K. Young and M.J. Currie
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Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China
Department of Physics, University of Oxford, Nuclear and Astrophysics Laboratory, Keble Road, Oxford OX1 3RH, UK
Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
We present a new catalogue of galaxies in the direction of the Virgo Cluster's core: the Virgo Photometry Catalogue (VPC). This catalogue contains 1180 galaxies (including background objects) within a 23 square-degree area of the sky centred on and . The VPC galaxy sample comprises of non-stellar objects brighter than ; the completeness limits being for the northern half of the survey area and for the southern half.
Independently-calibrated photographic surface photometry is presented for over 1000 galaxies in the U, and bands. Parameters listed for catalogued galaxies include: equatorial coordinates, morphological types, surface-brightness profile parameters (which preserve the majority of the original surface photometry information), U, & isophotal magnitudes, and [transformed] B total magnitudes, and equal-area and total colours, apparent angular radii, ellipticities, position angles, heliocentric radial velocities and alternative designations. All total magnitudes and total colours are extrapolated according to a new system denoted t in order to distinguish it from the T system already in use.
The VPC is based primarily on four (one U, two and one ) UK-Schmidt plates, all of which were digitised using the Royal Observatory Edinburgh's (ROE) COSMOS measuring machine. All magnitudes, colours and surface-brightness parameters are derived from numerical integrations of segmented plate-scan data, except for (in 109 cases) saturated or (in 51 cases) inextricably-merged images; our segmentation software being able to cope with the vast majority of image mergers.
keywords: galaxies: clusters: individual: Virgo -- catalogues -- galaxies: fundamental parameters -- galaxies: photometry