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For refcode 1998ApJ...506L.101V:
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1998ApJ...506L.101V Enhanced H{alpha} Emission in Early-Type Galaxies Belonging to Compact Groups J. M. VILCHEZ AND J. IGLESIAS-PARAMO Instituto de Astrofisica de Canarias, C/Via Lactea s.n., E-38200 La Laguna, Tenerife, Spain; jvm@ll.iac.es, jiglesia@ll.iac.es Received 1998 July 1; accepted 1998 August 17; published 1998 September 9 ABSTRACT The results of H{alpha} photometry of a sample of early-type galaxies belonging to nearby compact groups are presented. Over 75% of the galaxies in the sample were detected in H{alpha}, a result that we have interpreted as proof of the presence of a warm interstellar medium within them. Comparing the H{alpha} luminosities of the galaxies in our sample with those of a sample of early-type galaxies from the field, we have found that field early-type galaxies are systematically fainter in H{alpha} than the compact group ones for a given B absolute magnitude by {DELTA} log (L_H{alpha}_/L_B_ ~ 0.5. We suggest that the excess in the H{alpha} emission within the groups is due to photoionization of gas by Lyman continuum photons emitted by massive stars. Recent massive star formation would be a consequence of the accretion by early-type galaxies of gas from the outer envelopes of gas-rich galaxies experiencing close passages across the group. Subject headings: galaxies: elliptical and lenticular, cD-galaxies: evolution-galaxies: interactions-galaxies: ISM
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