Other
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.0404c&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #04.04; Bulletin of the American Astronomical Society, Vol. 31, p.826
Other
Scientific paper
We have examined the optical spectra of a complete sample of over 3100 galaxies to determine their spectral types as a function of their environment. The sample is drawn from a redshift survey with median z ~ .046 which is 90% complete to 15.4 in R\@. All spectra, which cover 3600--7400 Angstroms, were taken with a 3 arcsecond slit and have typical S/N ~ 10. We determine spectral types from measurements of detected spectral lines, where H_alpha , [OII]lambda 3727, and other prominent lines are detected at equivalent widths of >= 5 Angstroms@. Galaxies with detected emission make up slightly more than half our sample. The relative fraction of emission-line galaxies drops at the highest densities, presumably because the cluster environment strips gas from galaxies. The galaxies with the highest star-forming rates (measured from H_alpha flux) occur mainly in the lowest density regions. We also find that both AGNs and galaxies with high star-formation rates are more likely to have nearby companions than less-active galaxies, suggesting that both star formation and AGN activity can be boosted by interactions with a nearby galaxy.
Carter B. J.
Fabricant Dan G.
Geller Margaret J.
Kurtz Michael J.
McLean Brian
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