Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400l..55p&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 400, no. 2, p. L55-L58.
Astronomy and Astrophysics
Astrophysics
21
Dwarf Galaxies, Elliptical Galaxies, Interacting Galaxies, Irregular Galaxies, Virgo Galactic Cluster, Astronomical Photometry, Cosmology, Galactic Structure, H I Regions, Intergalactic Media, Interstellar Gas
Scientific paper
We present new B and I CCD and H I observations of the system in the Virgo Cluster composed of the dwarf irregular galaxy UGC 7636 and the giant elliptical galaxy NGC 4472. These observations strongly suggest that both ram-pressure and tidal stripping have occurred in this system. The H I gas between the two galaxies has been stripped from UGC 7636. Its M(H I)/LB ratio is 0.26 solar mass/solar blue luminosity, in the range observed for dwarf irregulars. Ram-pressure stripping of the H I gas from the dwarf is suggested by the large velocity width (about 110 km/s) of the spatially extended H I envelope. The presence of a red optical tidal tail and countertail in the dwarf, with the same colors as the stars in the dwarf's outer regions, as well as a disturbed morphology in the dwarf's inner parts, are evidence for tidal interaction between the two galaxies.
Patterson Richard J.
Thuan Trinh Xuan
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