Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..223r&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 223-224 (SEE N93-26706 10-90)
Computer Science
Collisions, Energy Requirements, Galaxies, Stellar Mass, Supernovae, Atoms, Debris, Distance, High Resolution, Hydrogen, Tides
Scientific paper
We present WSRT HI observations of the nearby, disturbed, edge-on galaxy NGC 4631. A low-resolution (45 in. x 87 in.) map shows previously unknown tidal debris at large distances from the plane, and two dwarf companions. A high resolution (12 in. x 22 in.) map reveals a very disturbed gas layer in NGC 4631, with a wealth of small-scale structure. The most striking discovery is a supershell in the eastern half of the disk with a diameter of about 3 kpc, a mass of approximately 10 exp 8 solar mass and a tentative expansion velocity of 45 km/s. If the expansion is real, the energy which must have been injected by supernovae to explain the shell's current parameters is roughly 4 x 10(exp 55) ergs. Such a high energy requirement suggests an alternative formation mechanism, such as a collision with a small companion.
Rand Richard J.
van der Hulst J. M.
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