J/ApJ/582/668ivo://CDS.VizieR/J/ApJ/582/668doi:10.26093/cds/vizier.15820668CDSBarton Gillespie E.Geller M.J.Kenyon S.J.2012-09-24T07:24:01Z2004-07-21T15:38:58ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsredshiftedphotometryline-intensitiesGalaxy-galaxy interactions rearrange the baryons in galaxies and trigger substantial star formation; the aggregate effects of these interactions on the evolutionary histories of galaxies in the universe are poorly understood. We combine B- and R-band photometry and optical spectroscopy to estimate the strengths and timescales of bursts of triggered star formation in the centers of 190 galaxies in pairs and compact groups. Based on an analysis of the measured colors and EW(H{alpha}), we characterize the preexisting and triggered populations separately. The best-fitting burst scenarios assume stronger reddening corrections for line emission than for the continuum and continuous star formation lasting for >~100Myr. The most realistic scenarios require an initial mass function that is deficient in the highest mass stars. The color of the preexisting stellar population is the most significant source of uncertainty. Triggered star formation contributes substantially (probably >~50%) to the R-band flux in the central regions of several galaxies; tidal tails do not necessarily accompany this star formation. Many of the galaxies in our sample have bluer centers than outskirts, suggesting that pre- or nonmerger interactions may lead to evolution along the Hubble sequence. These objects would appear blue and compact at higher redshifts; the older, redder outskirts of the disks would be difficult to detect. Our data indicate that galaxies with larger separations on the sky contain weaker, and probably older, bursts of star formation on average. However, confirmation of these trends requires further constraints on the colors of the older stellar populations and on the reddening for individual galaxies.2003ApJ...582..668Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/582/668CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/582/668https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/582/668http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/582/668https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/582/668https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/582/668http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/582/668GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/582/668/table1 (*The SP Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/582/668/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/582/668/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/582/668/table1?GETtext/xml+votable180.050000true1.58926817.4297050.0055555555555555566/1680 2566 2641 2790 2830 4188 4215 4377 4449 4453 4457 4477 4550 4718 4753 4756 4806 4839 4870 4880 4913 4990 5009 5011 5064 5082 5671 5773 5796 8391 8469 8526 8562 8617 8641 8754 8887 9828 9830 9836 9883 9885 10328 10401 10588 10609 10628 10629 10637 10674 10752 10841 12455 12706 13459 13463 13550 18068 18085 18209 18367 18400 18813 18895 19167 19538 19540 19624 19703 19732 20060 20061 20123 20213 20237 20308 20336 20417 22356 26495 26563 27595 27620 27752 28146 28225 28464 28515 28593 28617 30070 32482https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/582/668?format=asciiOpticaldefaultJ/ApJ/582/668/table1*The SP Samplef_RMAGFlag on RMAG (4)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAB1950Hour of Right Ascension (B1950)pos.eq.ra;meta.mainDEB1950Degree of Declination (B1950)pos.eq.dec;meta.mainNGalNumber of galaxies in systemmeta.numberintczRedshiftkm/ssrc.redshift;pos.heliocentricintDSepPair separation on the sky in units of kpc/h (1)kpcpos.distancefloatVSepVelocity separation of pair (2)km/sphys.veloc;arith.diffintRMAGAbsolute R band magnitude (3)magphys.magAbs;em.opt.RfloatB-RThe (B-R) color of the galaxy portion on the slit during the spectroscopic observation (5)magphot.color;em.opt.B;em.opt.RfloatEWHAThe H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.HalphafloatBalmer? Balmer decrement corrected for Balmer absorption, H{alpha}/H{beta} (6)meta.notefloatnullableVWid? Corrected velocity widthkm/sspect.line.widthfloatnullableRotDesA rotation curve description (7)meta.notecharFigLabel for Figures 23 and 24meta.idchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed