Journal Article

Possible formation scenarios for the giant H <span class="smallCaps">I</span> envelope around the NGC 4490/4485 system

M. S. Clemens, P. Alexander and D. A. Green

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 4, pages 1015-1020
Published in print July 1998 | ISSN: 0035-8711
Published online July 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-8711.1998.01510.x
Possible formation scenarios for the giant H I envelope around the NGC 4490/4485 system

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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 56 kpc. We argue that this distribution of neutral hydrogen can best be explained by a galactic-scale bipolar outflow of H i driven by supernovae in NGC 4490. The flow from the disc appears to be reasonably well collimated and has probably persisted for approximately 6 × 108 yr. The implications for galaxy evolution when such mass loss occurs are briefly discussed.

Keywords: galaxies: evolution; galaxies: individual: NGC 4485; galaxies: individual: NGC 4490; galaxies: interactions; radio lines: galaxies

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Subjects: Astronomy and Astrophysics

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