NGC 3928 - A highly bulge-dominated compact spiral galaxy

Details NGC 3928 - A highly bulge-dominated compact spiral galaxy NGC 3928 - A highly bulge-dominated compact spiral galaxy

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313...89t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 89-101.

Astronomy and Astrophysics

Astrophysics

16

Astronomical Spectroscopy, Compact Galaxies, Galactic Bulge, Galactic Structure, Spiral Galaxies, Star Distribution, Galactic Evolution, Galactic Nuclei, H Ii Regions, Metallicity, Star Formation

Scientific paper

Spectroscopic and surface photometric observations have been made of the blue early-type galaxy NGC 3928 (Markarian 190). This galaxy is an unusual composite system with both a miniature spiral disk (diameter about 2.4 kpc) and a spheroidal stellar envelope (diameter about 9.4 kpc). Spectroscopic properties of the nuclear emitting region are similar to those of low-excitation giant H II regions in normal spiral galaxies. This indicates that moderate star-forming activity has occurred in the central region as well as in the miniature disk and may be responsible for the relatively bluer color. Since the metallicity of the ionized gas is normal, the chemical properties of NGC 3928 are comparable to those of normal-aged or normal-sized galaxies in spite of its low luminosity (-17.6 mag). The surface photometric observations reveal that NGC 3928 is a highly bulge-dominated galaxy. NGC 3928 can be interpreted as a compact spiral disk embedded in the central region of a large spheroidal component.

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