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A&A Supplement series, Vol. 127, February I 1998, 367-395

Received February 25; accepted May 22, 1997

The "Virgo photometry catalogue''; a catalogue of 1180 galaxies in the direction of the Virgo Cluster's core

C.K. Young tex2html_wrap3341 and M.J. Currie tex2html_wrap3343

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tex2html_wrap3345  Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China

tex2html_wrap3347  Department of Physics, University of Oxford, Nuclear and Astrophysics Laboratory, Keble Road, Oxford OX1 3RH, UK

tex2html_wrap3349  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)gif. This catalogue contains 1180 galaxies (including background objects) within a 23 square-degree area of the sky centred on tex2html_wrap_inline3297 and tex2html_wrap_inline3299. The VPC galaxy sample comprises of non-stellar objects brighter than tex2html_wrap_inline3301; the completeness limits being tex2html_wrap_inline3303 for the northern half of the survey area and tex2html_wrap_inline3305 for the southern half.

Independently-calibrated photographic surface photometry is presented for over 1000 galaxies in the U, tex2html_wrap_inline3309 and tex2html_wrap_inline3311 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, tex2html_wrap_inline3309 & tex2html_wrap_inline3311 isophotal magnitudes, tex2html_wrap_inline3309 and [transformed] B total magnitudes, tex2html_wrap_inline3323 and tex2html_wrap_inline3325 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 tex2html_wrap_inline3309 and one tex2html_wrap_inline3311) 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

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