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For refcode 1996AJ....112..937D:
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1996AJ....112..937D NEUTRAL HYDROGEN AROUND EARLY-TYPE GALAXIES KIMBERLY DUPRIE AND STEPHEN E. SCHNEIDER Five College Astronomy Department and Department of Physics and Astronomy, Universiry of Massachusetts, 536 Lederle Tower, Amherst, Massachusetts 01003 Electronic mall: schneide@phast.umass.edu Received 1996 April 8; revised 1996 June 4 ABSTRACT When early-type (E,S0) galaxies have neutral hydrogen gas associated with them, it is often located over a very extended region. This suggests several possible origins for the gas, either intrinsic to the galaxy or from an external source. We present 21 cm H I maps around early-type galaxies to study the distribution of gas in the galaxies vicinity and address these possibilities. We examine two sets of objects: (I) early- type galaxies with conflicting HI measurements that might indicate unusual gas distributions, and (2) galaxy groups that are dominated by early-type galaxies. We have identified several galaxies with extended H I disks, and a number of H I companions that may be interacting with the early-type galaxies and may be confusing H I observations. Many of the companions can be optically associated with uncataloged dwarf galaxies, but a few are quite peculiar or have no clear optical association. We discuss the implications of these results for the origin of H I in early-type galaxies.
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