Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..634i&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 634-660.
Astronomy and Astrophysics
Astrophysics
213
Dwarf Galaxies, Faint Objects, Virgo Galactic Cluster, Astronomical Photometry, Brightness, Centimeter Waves, Hydrogen Atoms, Luminosity, Magnitude, Radio Galaxies, Red Shift, Spiral Galaxies
Scientific paper
A sample of 137 low surface brightness galaxies in the Virgo Cluster has been studied, with initial selection on photographically amplified UK Schmidt plates. The limiting isophote for galaxy detection is ≈27 mag arcsec-2. There is substantial overlap with existing catalogs of Virgo dwarf galaxies, but the 27 new galaxies have unusually low surface brightness and large angular size. CCD images are used to derive surface photometry for 26 objects, and the radial profiles are generally well fitted by an exponential. The colors are unusually blue for ellipticals, implying low metallicity and relatively youthful ages. The star formation history that can lead to galaxies with such blue stars and such low surface mass densities is unknown. The relationships between the structural parameters of dwarf galaxies are discussed, with an emphasis on the selection effects imposed by the brightness of the night sky.
Bothun Greg
Impey Chris
Malin David
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