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Low Surface Brightness Dwarf Galaxies in the Bristol – Anglo-Australian Observatory Virgo Cluster Survey

Published online by Cambridge University Press:  12 April 2016

J.B. Jones ,
S. Phillipps ,
J.M. Schwartzenberg  and
Q.A. Parker
J.B. Jones
Affiliation:
Astrophysics Group, Department of Physics, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
S. Phillipps
Affiliation:
Astrophysics Group, Department of Physics, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
J.M. Schwartzenberg
Affiliation:
Astrophysics Group, Department of Physics, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
Q.A. Parker
Affiliation:
Anglo-Australian Observatory, Siding Spring, Coonabarabran, New South Wales 2357, Australia

Abstract

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We describe a new, deep photographic survey of the Virgo Cluster which uses multiple exposures on Tech Pan film with the United Kingdom Schmidt Telescope to probe the dwarf population to fainter surface brightness limits than previous surveys. We have identified galaxies having sizes (≥ 3 arcsec scale length) and surface brightnesses (≤ 24.5 R mag arcsec−2) characteristic of those expected for dwarf spheroidal galaxies in the cluster. The survey is providing substantial samples of extremely low luminosity galaxies outside the environment of the Local Group and nearby groups for the first time. An initial study of two small areas has found dwarf spheroidal candidates in large numbers (500 deg−2) which indicate a steep, continuously rising luminosity function at low luminosities.

Type
Luminosity and surface brightness distributions
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 84 - 91
Copyright
Copyright © Astronomical Society of the Pacific 1999

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