Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..102w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, Jan. 1991, p. 102-110. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
3
Astronomical Photometry, Charge Coupled Devices, Spiral Galaxies, Color, Cosmic Dust, Elliptical Galaxies, Galactic Bulge, Imaging Techniques, Interstellar Matter
Scientific paper
The structure and colors of NGC 3990 and NGC 3998 are investigated using BR CCD imagery. Fits of bulge-disk models of the galaxies indicate that both disks are somewhat brighter and more compact than typical S0 galaxies in the Virgo and Fornax clusters. Although the two galaxies are separated by only about 3.5 arcmin, none of the obvious signs of gravitational interaction are seen. The colors of both galaxies are normal; the disk of NGC 3998 is somewhat bluer than its bulge. The search has failed to reveal the interstellar dust predicted from the neutral hydrogen observations of NGC 3998. The dust that is seen appears to be mixed with ionized gas which occupies the center of this galaxy and may be the same material seen at longer wavelengths by the IRAS experiment. Its low abundance relative to the neutral gas is consistent with the idea that the ISM was contributed by a gas-rich dwarf galaxy in a destructive merger.
Dupuy David L.
Welch Dorothy M. K.
Welch Gary A.
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