Neutral Hydrogen Around Early-Type Galaxies

Details Neutral Hydrogen Around Early-Type Galaxies Neutral Hydrogen Around Early-Type Galaxies

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112..937d&link_type=abstract

Astronomical Journal v.112, p.937

Astronomy and Astrophysics

Astronomy

32

Galaxies: Early-Type, Galaxies: Elliptical And Lenticular, Galaxies: Ism

Scientific paper

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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