J/MNRAS/478/3447ivo://CDS.VizieR/J/MNRAS/478/3447doi:10.26093/cds/vizier.74783447CDSEllison S.L.Catinella B.Cortese L.2024-08-18T20:19:54Z2021-12-10T13:07:50ZCDS support team

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

cds-question@unistra.frgalaxiesh-i-line-emissionWe present a detailed assessment of the global atomic hydrogen gas fraction (f_gas_=log[M_HI_/M*) in a sample of post-merger galaxies identified in the Sloan Digital Sky Survey (SDSS). Archival HI measurements of 47 targets are combined with new Arecibo observations of a further 51 galaxies. The stellar mass range of the post-merger sample, our observing strategy, detection thresholds and data analysis procedures replicate those of the extended GALEX Arecibo SDSS Survey (xGASS) which can therefore be used as a control sample. Our principal results are (1) the post-merger sample shows a ~50 per cent higher HI detection fraction compared with xGASS; (2) accounting for non-detections, the median atomic gas fraction of the post-merger sample is larger than the control sample by 0.3-0.6dex; and (3) the median atomic gas fraction enhancement ({Delta}f_gas_), computed on a galaxy-by-galaxy basis at fixed stellar mass, is 0.51dex. Our results demonstrate that recently merged galaxies are typically a factor of ~3 more HI rich than control galaxies of the same M* If the control sample is additionally matched in star formation rate, the median H I excess is reduced to {Delta}f_gas_=0.2dex, showing that the enhanced atomic gas fractions in post-mergers are not purely a reflection of changes in star formation activity. We conclude that merger-induced starbursts and outflows do not lead to prompt quenching via exhaustion/expulsion of the galactic gas reservoirs. Instead, we propose that if star formation ceases after a merger, it is more likely due to an enhanced turbulence which renders the galaxy unable to effectively form new stars.2018MNRAS.478.3447Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/478/3447CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/77 : HI spectral properties of galaxies (Springob+, 2005)J/AJ/142/170 : ALFALFA survey: the {alpha}.40 HI source catalogJ/MNRAS/476/875 : xGASS catalog (Catinella+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/478/3447https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/478/3447http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/478/3447https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/478/3447https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/478/3447http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/478/3447GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/478/3447/table1 (Arecibo observations of post-mergers, ordered by SDSS objID)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/3447/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/3447/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/3447/table1?GETtext/xml+votable180.050000true179.239553.280630.005555555555555556Cone search capability for table J/MNRAS/478/3447/table2 (properties and atomic gas fractions of the final post-merger sample, ordered by SDSS objID)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/3447/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/3447/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/3447/table2?GETtext/xml+votable180.050000true179.239553.280630.0055555555555555566/4106 4112 4270 4422 4500 4532 4554 4621 4647 4652 4712 4766 4844 4864 5040 5123 5201 5210 5219 5223 5270 5295 5346 5383 6417 8241 8247 8269 8315 8407 8471 8508 8556 8567 8615 8623 8675 8685 8728 8740 8768 8816 8823 8877 8891 8940 9055 9122 9200 9227 9230 9244 9340 9376 9384 9454 10376 10381 10465 10471 10518 10540 10765 10774 21965 22010 22355 22361 26228 26326 26407 26413-26414 26484 26495 26561 27047 27060 27083 27108 27256 27263 27328 27360 27423 27433 27486 27593 27649 27662 27674 27697 27760 27799 27824 28261 28378 28409 28438 28446 28542 31469 31484 31653 31678https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/478/3447?format=asciiRadiodefaultJ/MNRAS/478/3447/table1Arecibo observations of post-mergers, ordered by SDSS objIDSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSDSS DR7 objIDmeta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzHI? HI redshiftsrc.redshift;pos.heliocentricdoublenullableTonOn-source integration time of the Arecibo observationmintime.expointW50? Observed velocity width of the source line profile, measured at the 50% level of each peakkm/sspect.line.widthfloatnullableSobs? Observed HI fluxJy.km/sphot.flux.density;em.radio.750-1500MHzfloatnullablee_Sobs? Observed HI flux errorJy.km/sstat.errorfloatnullablermsrms noise of the observationmJystat.stdev;instr.det.noise;obsfloatS/N? Signal-to-noise ratiostat.snrfloatnullableSloanDisplay the online SDSS data for the objectmeta.ref.urlcharJ/MNRAS/478/3447/table2properties and atomic gas fractions of the final post-merger sample, ordered by SDSS objIDSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobjIDSDSS DR7 objIDmeta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzSDSSSDSS redshiftsrc.redshift;pos.heliocentricfloatlogM*Stellar masslog(solMass)phys.massfloatl_logMHILimit flag on logMHImeta.code.errorcharlogMHI? HI masslog(solMass)phys.massfloatnullablel_logfgasLimit flag on logfgasmeta.code.errorcharlogfgas? Global atomic hydrogen gas fraction (log[MHI/M*])phys.mass;arith.ratiofloatnullablel_DfgasLimit flag on Dfgasmeta.code.errorcharDfgas? Median atomic gas fraction enhancement, {DELTA}fgas (1)phys.mass;arith.ratiofloatnullableRefHI reference (2)meta.ref;pos.framecharSloanDisplay the online SDSS data for the objectmeta.ref.urlchar