Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90..697b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, May 1985, p. 697-707.
Astronomy and Astrophysics
Astronomy
78
Dwarf Galaxies, Elliptical Galaxies, Hydrogen Clouds, Molecular Clouds, Virgo Galactic Cluster, Astronomical Photometry, Brightness, Color-Magnitude Diagram, Mass To Light Ratios, Metallicity, Optical Emission Spectroscopy, Stellar Evolution, Stellar Magnitude, Velocity Distribution
Scientific paper
The authors have obtained 21-cm H I observations of a sample of 32 dwarf irregular (dI) and 12 dwarf elliptical (dE) galaxies that are located in the Virgo cluster. Altogether, 18 of 32 dIs were detected in H I, but none of the dEs were detected at a sensitivity level of MHI = 2 - 3×106M_sun;. The detected dIs have MHI > 3×107M_sun;. This disparity in H I content between dIs and dEs effectively dispels the possibility that the dEs are presently in a stage of quiescence (hibernation), between bursts of star formation. In order to supplement the 21-cm data, the authors have acquired optical spectroscopy, CCD images, and infrared photometry for a limited subsample of these dwarfs. They discuss the general H I, infrared, and dynamical properties of the dwarfs and show how these properties relate to the hypothesis previously outlined, namely that dEs may be stripped dIs.
Bothun Gragory D.
Caldwell Nelson
Mould Jeremy R.
Wirth Achim
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