Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1414d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1414-1420. Research supported by the Alfred P. Sloan Foundation and
Astronomy and Astrophysics
Astronomy
6
Astronomical Spectroscopy, Galactic Evolution, Optical Emission Spectroscopy, Starburst Galaxies, Absorption Spectra, Brightness Distribution, Charge Coupled Devices, Emission Spectra, Infrared Astronomy Satellite, Red Shift
Scientific paper
An optical imaging and spectroscopic study of an ultraluminous, gas-rich infrared Astronomical Satellite (IRAS) galaxy, VII Zw 31 is presented. The data suggest that the object is a merger-induced starburst and in that respect similar to many other ultraluminous IRAS galaxies. Asymmetries and distortions are seen in the visible light, and a prominent dust lane is detected near the nucleus. The spectra show strong, low-ionization line emission, consistent with photoionization by young stars, and substantial internal extinction. Absorption spectra suggest a presence of both young and old stellar populations. The object is interpreted as an old galaxy, rejuvenated by a recent starburst. Since the large molecular gas content (about 50 percent of the total mass) is the main distinguishing characteristic of this object, the starburst must be just in its initial stages. VII Zw 31 may thus be a low-redshift analog of at least some protogalaxies at large redshifts.
de Carvalho Reinaldo R.
Djorgovski Stanislav
Thompson Daniel J.
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