J/ApJ/549/820ivo://CDS.VizieR/J/ApJ/549/820doi:10.26093/cds/vizier.15490820CDSCouch W.J.Balogh M.L.Bower R.G.Smail I.Glazebrook K.Taylor M.2001-05-26T19:58:56Z2001-05-26T19:57:29ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxy-clustersgalaxiesspectroscopyvisible-astronomyh-alpha-photometryWe present the results of a wide-field survey for H{alpha}-emitting galaxies in the cluster AC 114 at z=0.32. Spectra centered on H{alpha} at the cluster redshift have been obtained for 586 galaxies to I_tot_~22 out to a radius of ~h_50_^-1^Mpc. At most, only ~10% of these were found to be H{alpha}-emitting cluster members. These objects are predominantly blue and of late-type spiral morphology, consistent with them hosting star formation. However, ~65% of the cluster members classified morphologically as spirals (with HST) have no detectable H{alpha} emission; star formation and morphological evolution in cluster galaxies appear to be largely decoupled. Changes in the H{alpha} detection rate and the strength of H{alpha} emission with environment (as traced by local galaxy density) are found to be weak within the region studied. Star formation within the cluster members is also found to be strongly and uniformly suppressed with the rates inferred from the H{alpha} emission not exceeding 4M_{sun}_/yr, and AC 114's H{alpha} luminosity function being an order of magnitude below that observed for field galaxies at the same redshift. None of the galaxies detected have the high star formation rates associated with "starburst" galaxies; however, this may still be reconcilable with the known (8%+/-3%) fraction of "post-starburst" galaxies within AC 114, given the poorly determined but short lifetimes of starbursts and the possibility that much of the associated star formation is obscured by dust.2001ApJ...549..820Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/549/820CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/497/188 : A103, A118 and A114 morphological studies (Couch+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/549/820https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/549/820http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/549/820https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/549/820https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/549/820http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/549/820GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/549/820/table1 (Relevant data for the 586 unique galaxies observed in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/549/820/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/549/820/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/549/820/table1?GETtext/xml+votable180.050000true344.679752222-34.8818655560.0055555555555555566/46571https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/549/820?format=asciiOpticaldefaultJ/ApJ/549/820/table1Relevant data for the 586 unique galaxies observed in this studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CBB2001]Galaxy identificationmeta.id;meta.mainintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainImagI band magnitudemagphot.mag;em.opt.IfloatTtype? T-type classificationsrc.morph.typeintnullableHtype? Hubble classificationsrc.morph.typecharDetectDetection class (1)src.classintz? Redshiftsrc.redshiftdoublenullableHaH{alpha} flux in 10^-17^ergs/s/cm^2^1e-21W.m**-2phot.fluxfloate_HaError in Ha in 10^-17^ergs/s/cm^2^1e-21W.m**-2stat.errorfloatLHaH{alpha} luminosity in 10^40^ergs/s (2)1e+33Wphys.luminosityfloatSFRStar formation rate (2)solMass/yrphys.SFRfloat