Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..164m&link_type=abstract
NOAO Proposal ID #1999A-0164
Other
Scientific paper
As part of a thesis investigating the effect of the cluster environment on galaxy evolution, we have used radio observations to identify active galaxies in nearby Abell clusters. The radio data form an unprecedented combination of sensitivity and scale allowing us to identify starbursts and AGN out to large radial distances from the cluster cores, thereby probing the cluster environment over four orders of magnitude in galaxy density. We require optical spectra of many of the identified radio galaxies in order to fully address issues of the cluster environment's effect. The spectra will: 1) Confirm cluster membership for galaxies without spectroscopic redshifts. This is particularly important for identified galaxies at large radial distance from the cluster cores. 2) Separate starbursts from AGN. This will be used to draw conclusions about the environmental effects on each of these types of active galaxies, and potentially elucidate their postulated connection. 3) Provide optical estimates of the SFRs in the galaxies. These will be used to help calibrate other SFR estimators and determine the impact of reddening/extinction and AGN contamination on optical star formation indicators. As well as identifying trends in SFRs in cluster environments, these data will provide additional local information about SFR estimators that may be applied to higher redshift galaxies in studying the star formation history of the universe.
Miller Neal A.
Owen Frazer N.
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