Possible formation scenarios for the giant HI envelope around the NGC 4490/4485 system

Details Possible formation scenarios for the giant HI envelope around the NGC 4490/4485 system Possible formation scenarios for the giant HI envelope around the NGC 4490/4485 system

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297.1015c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 4, pp. 1015-1020.

Astronomy and Astrophysics

Astronomy

17

Galaxies: Evolution, Galaxies: Individual: Ngc 4485, Galaxies: Individual: Ngc 4490, Galaxies: Interactions, Radio Lines: Galaxies

Scientific paper

We present observations of Hi in the nearby interacting galaxies NGC 4490 and 4485 made with the VLA in both C and D arrays. The galaxies are embedded in an extensive envelope of neutral hydrogen which is elongated in a direction approximately perpendicular to the plane of NGC 4490, with an extent of about 56kpc. We argue that this distribution of neutral hydrogen can best be explained by a galactic-scale bipolar outflow of Hi driven by supernovae in NGC 4490. The flow from the disc appears to be reasonably well collimated and has probably persisted for approximately 6x10^8yr. The implications for galaxy evolution when such mass loss occurs are briefly discussed.

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