Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..597p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 15, 1986, p. 597-604.
Astronomy and Astrophysics
Astrophysics
23
Astronomical Photometry, Galactic Evolution, Galactic Structure, Spectrophotometry, Brightness Distribution, Color, Line Spectra, Luminosity
Scientific paper
Low-dispersion spectra of two shell galaxies, NGC 3923 and NGC 3051, have been obtained covering the 5300-10,000 A spectral range. The shells in NGC 3923 are all 3-5 percent as bright as the underlying galaxy, showing that the shells roughly follow the same luminosity distribution which describes the galaxy itself. The shells in NGC 3051 are much brighter than in NGC 3923, and the two inner shells are found to have nearly constant surface brightness as a function of radius out to an abrupt cutoff radius. Some gas and dust is detected in both galaxies, but there is no excess emission in the shells, showing that the shell luminosity comes nearly completely from stellar continuum radiation. The shells have the same V-R and R-I colors as the underlying galaxy, which suggests that the shell material came from the merger with an E or S0 galaxy.
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