The Role of Interactions in the Evolution of Highly Star-forming Early-Type (Sa-Sab) Spiral Galaxies

Details The Role of Interactions in the Evolution of Highly Star-forming Early-Type (Sa-Sab) Spiral Galaxies The Role of Interactions in the Evolution of Highly Star-forming Early-Type (Sa-Sab) Spiral Galaxies

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.3005h&link_type=abstract

The Astronomical Journal, Volume 125, Issue 6, pp. 3005-3024.

Astronomy and Astrophysics

Astronomy

4

Galaxies: Evolution, Galaxies: Interactions, Galaxies: Ism, Galaxies: Spiral

Scientific paper

We present a search for the signatures of galaxy-galaxy interactions in the neutral gas of early-type spirals. New neutral hydrogen observations for four highly star-forming early-type spirals are presented here, along with H I data for three additional galaxies from other sources. H I maps of six of seven galaxies reveal unambiguous signs of a recent encounter, via tidal tails and H I bridges. Most of these galaxies appear undisturbed in the optical, and these interactions probably would have gone unnoticed without H I mapping. Such high rates of interaction suggest that galactic encounters may play an important role in the evolution of early-type spiral galaxies.

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