Blue compact galaxies - Infants of the Universe?

Details Blue compact galaxies - Infants of the Universe? Blue compact galaxies - Infants of the Universe?

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..38....2b&link_type=abstract

ESO Messenger (ISSN 0722-6691), Dec. 1984, p. 2-6.

Astronomy and Astrophysics

Astronomy

2

Astronomical Models, Astronomical Spectroscopy, Compact Galaxies, Galactic Evolution, Spatial Distribution, Universe, Brightness Distribution, Charge Coupled Devices, Galactic Nuclei, Nebulae, Stellar Evolution, Stellar Systems, Ubv Spectra

Scientific paper

The blue light of blue compact galaxies (BCGs) is a consequence of their high proportion of young stars. Their compact appearance is due to relatively small dimensions and high surface brightness, which produce overexposed images on photographic survey plates. The IR image of the BCG ESO 338-IG04, however, exhibits regular isophotes reminiscent of an old galaxy, as well as a luminosity profile typical of old stellar systems. The assumption that these galaxies are indeed young is presently tested through a synthesis of their color evolution as a function of time, followed by a comparison of these results with observations. It is concluded that the possibility that a large portion of the mass of BCGs may take the form of old stars cannot be ruled out.

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