Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.312..236c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 312, Issue 2, pp. 236-246.
Astronomy and Astrophysics
Astronomy
18
Galaxies: Evolution, Galaxies: Individual: Ngc 4485, Galaxies: Individual: Ngc 4490, Galaxies: Interactions, Galaxies: Ism, Radio Lines: Galaxies
Scientific paper
This paper describes submm, 12CO (J=2-1) observations of the interacting pair of galaxies NGC 4490 and 4485, and together with high resolution Hi and multifrequency radio continuum data we investigate the evolution of the ISM in this system. We find the following. (i) The smaller member of the pair, NGC 4485, has had the atomic, molecular and dust components of its ISM stripped via ram pressure during its recent passage through the extended Hi distribution of NGC 4490. A bow-shock is identified in the Hi ahead of the stripped gas. (ii) Within the disc of NGC 4490 we find a very low H2-to-Hi ratio as well as a strong correlation between thermal emission and mass of H2 suggesting that the star formation rate is limited in this case by the conversion of Hi to H2. (iii) 12CO emission from an Hi and radio-continuum bridge between the two galaxies is detected.
Alexander Paul
Clemens M. S.
Green David A.
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