Spectroscopic properties and luminosity distribution of the Universidad Complutense de Madrid survey galaxies
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1997
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American Astronomical Society
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Abstract
A spectroscopic analysis of the entire sample of Ha emission-line galaxies (ELGs) contained in lists 1 and 2 of the Universidad Complutense de Madrid (UCM) objective-prism survey is presented. A significant fraction (59%) of star-forming galaxies with low-ionization or high-extinction properties has been found. This kind of ELG is only incompletely detected in the blue or in other ELG surveys. We have found evidence for evolution among some of the different ELG classes. A comparison between the populations detected by the Case, Kiso, University of Michigan, and UCM surveys is presented. We conclude that a deep H_α survey is better able to sample all the ages, evolutionary stages, and luminosities of currently star-forming galaxies than other surveys using blue emission lines or colors. Finally, the luminosity and spatial distributions of the UCM galaxies are determined. The contribution of the newly found, currently star-forming ELGs provides new clues to galaxy evolution and has to be taken into account when trying to consider the density of ELGs and total star formation rate in the universe.
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© 1997. The American Astronomical Society. Partly based on observations collected at the German-Spanish Astronomical Center, Calar Alto, Spain, operated by the Max-PlanckInstitute für Astronomie (MPIA), Heidelberg, jointly with the Spanish National Commission for Astronomy. Partly based on observations made with the Isaac Newton Telescope, operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias. This work was supported in part by the Spanish Programa Sectorial de Promoción del Conocimiento under grants PB89-124 and PB93-456. J. G. acknowledges partial financial support from NASA grant GO-05994.01-94A. He is grateful to D. C. Koo and R. Guzmán for their hospitality at Lick Observatory, University of California, Santa Cruz.