Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186...77m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 77-83.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Photometry, Compact Galaxies, Galactic Structure, Star Formation, Ubv Spectra, Astronomical Catalogs, Dwarf Galaxies, Emission Spectra, Irregular Galaxies, Line Spectra, Markarian Galaxies
Scientific paper
UBVRI colors for 80 Zwicky compact galaxies (ZCG) are presented. It is found that those with sharp emission lines have the same color indices as other objects selected in different ways but also showing stellar formation activity, namely the Markarian (non Seyfert) galaxies, the Blue Compact Dwarfs and the Irregulars. For a fraction of them, the reddest, evolutionary models with declining star formation rates can reproduce conveniently the observed colors. The bluest emission line ZCG have colors of star-burst galaxies but only for some extreme cases like IZw207 there is some evidence for the red colors for the presence of an underlying red supergiant population. For this group of objects, the observed colors indicate that very recent and massive starbursts have occurred or that the IMF could be flatter than the Salpeter law. Regarding the ZCG without emission lines and U-B > 0.4, their color indices are all like those of normal elliptical galaxies and can be well accounted by evolutionary models with just on initial burst of star formation. The presence of high luminosity stars can account for the compactness in all the galaxies with U-B < 0.4 but for the others, the similarity of their colors with those of normal ellipticals but with much higher surface luminosities point to a high stellar density for the origin of their compactness.
del Rio G.
Garcia-Pelayo Jose Manuel
Lahulla Felix
Moles Mariano
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