J/MNRAS/502/4815ivo://CDS.VizieR/J/MNRAS/502/4815doi:10.26093/cds/vizier.75024815CDSTrevisan M.Mamon G.A.Thuan T.X.Ferrari F.Pilyugin L.S.Ranjan A.2024-08-21T20:17:16Z2021-09-10T12:31:30ZCDS support team

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

cds-question@unistra.frgalaxiesgalaxy-classification-systemsIn the local Universe, there are a handful of dwarf compact star-forming galaxies with extremely low oxygen abundances. It has been proposed that they are young, having formed a large fraction of their stellar mass during their last few hundred Myr. However, little is known about the fraction of young stellar populations in more massive galaxies. In a previous article, we analysed 404000 Sloan Digital Sky Survey spectra to identify a surprisingly large sample of more massive very young galaxies (VYGs), defined to have formed at least 50 per cent of their stellar mass within the last 1Gyr. Here, we investigate in detail the properties of a subsample of 207 galaxies that are VYGs according to all three of our spectral models. We compare their properties with those of control sample galaxies (CSGs). We find that VYGs tend to have higher surface brightness and to be more compact, dusty, asymmetric, and clumpy than CSGs. Analysis of a subsample with H I detections reveals that VYGs are more gas rich than CSGs. VYGs tend to reside more in the inner parts of low-mass groups and are twice as likely as CSGs to be interacting with a neighbour galaxy. On the other hand, VYGs and CSGs have similar gas metallicities and large-scale environments (relative to filaments and voids). These results suggest that gas-rich interactions and mergers are the main mechanisms responsible for the recent triggering of star formation in low-redshift VYGs, except for the lowest mass VYGs, where the starbursts would arise from a mixture of mergers and gas infall.2021MNRAS.502.4815Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/502/4815CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/502/4815https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/502/4815http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/502/4815https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/502/4815https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/502/4815http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/502/4815GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/502/4815/info (Galaxy properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/502/4815/info?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/502/4815/info?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/502/4815/info?GETtext/xml+votable180.050000true159.793296932.63623890.0055555555555555565/1410 6/526 554 4098 4112 4116-4117 4119 4133 4138 4167 4169 4171 4173 4190 4194 4196 4199 4209 4211 4249 4253 4256 4277-4278 4288 4298 4301 4303-4304 4306 4309 4317 4327 4329 4337 4342 4351 4358 4373-4374 4380 4389 4392 4401 4418-4419 4423 4427 4429 4442 4453 4485 4488-4489 4491 4495 4501 4526 4533 4537 4544 4552 4567 4571 4573-4574 4593-4594 4600 4605 4608 4614 4617-4618 4620 4623-4624 4627 4630-4631 4645 4658 4677 4687-4689 4694 4702 4706 4716 4718 4727 4729 4734 4736 4745 4754 4758-4760 4762 4804 4811 4815 4821 4824 4828-4829 4839 4844 4863 4868 4871 4874 4897 4905 4928 4936 4948 4967 4972-4973 4981 4984-4985 4988 5005 5017 5019 5028 5031 5038-5039 5051 5057 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28576 28582 28584 28597 28599 28615 28624 28627 28634 28638 28656 28659 28662 30037 31384-31385 31390 31393 31404 31415 31422 31431 31437 31439-31440 31443 31460 31464 31468 31486 31534 31630 31635 31638 31649 31658 31663 31670 31698 31715 31718 31725 31733 31737 32421 32431 32441 36717 36719 36764 36767 36782 36789 36804 36861 49123https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/502/4815?format=asciiOpticaldefaultJ/MNRAS/502/4815/infoGalaxy propertiesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSDSS objIDmeta.id;meta.mainspecObjIDSDSS specObjIDmeta.idPlateSDSS spectroscopic platepos.parallax.spect;instr.plateintMJDSDSS modified Julian date of spectroscopic observationtime.epochintFiberSDSS spectroscopic fibrepos.parallax.spectintRAdegRight ascension (J2000)degpos.eq.raDEdegDeclination (J2000)degpos.eq.deczGalaxy spectroscopic redshiftsrc.redshiftfloatlogM*Vaz15Decimal logarithm of the galaxy stellar mass (1)log(solMass)phys.massfloatCGalaxy concentration (2)src.class.starGalaxyfloatmu50Galaxy surface brightness (3)mag.arcsec**-2phot.mag.sbfloatlogA1? Decimal logarithm of the asymmetry (4)src.morph.paramfloatnullablelogS1? Decimal logarithm of the smoothness (4)stat.fit.paramfloatnullablelogOH? Gas oxygen abundance log(O/H) + 12phys.abundfloatnullablefgas? Neutral gas mass fractionphys.massfloatnullableAvBalmer? Internal extinction in the V band estimated from the Balmer decrementmagphys.absorptionfloatnullableAvcontInternal extinction in the V band estimated from the SPS analysismagphys.absorptionfloatdist1kpc? Distance, in kpc, to the closest neighbour (5)kpcpos.distancefloatnullabledist1norm? Distance, in units of theta_50_, to the closest neighbour (5)pos.distancefloatnullableClass[0/1]? Sample flag (6)meta.codeintnullableSpInteractive spectrum from SDSSmeta.ref.urlchar_RAPositions from SDSS DR14 (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS DR14 (declination part)degpos.eq.dec;meta.main