J/MNRAS/476/3744ivo://CDS.VizieR/J/MNRAS/476/3744doi:10.26093/cds/vizier.74763744CDSLutz K.A.Kilborn V.A.Koribalski B.S.Catinella B.Jozsa G.I.G.,Wong O.I.Stevens A.R.H.Obreschkow D.Denes H.2024-08-18T20:18:38Z2019-08-21T15:13:16ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsh-i-line-emissionBy analysing a sample of galaxies selected from the HI Parkes All Sky Survey (HIPASS) to contain more than 2.5 times their expected HI content based on their optical properties, we investigate what drives these HI eXtreme (HIX) galaxies to be so HI-rich. We model the HI kinematics with the Tilted Ring Fitting Code TiRiFiC and compare the observed HIX galaxies to a control sample of galaxies from HIPASS as well as simulated galaxies built with the semi-analytic model DARK SAGE. We find that (1) HI discs in HIX galaxies are more likely to be warped and more likely to host HI arms and tails than in the control galaxies, (2) the average HI and average stellar column density of HIX galaxies is comparable to the control sample, (3) HIX galaxies have higher HI and baryonic specific angular momenta than control galaxies, (4) most HIX galaxies live in higher spin haloes than most control galaxies. These results suggest that HIX galaxies are HI-rich because they can support more HI against gravitational instability due to their high specific angular momentum. The majority of the HIX galaxies inherits their high specific angular momentum from their halo. The HI content of HIX galaxies might be further increased by gas-rich minor mergers. This paper is based on data obtained with the Australia Telescope Compact Array through the large program C2705.2018MNRAS.476.3744Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/476/3744CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/467/1083 : HIX galaxy survey. I. (Lutz+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/476/3744https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/476/3744http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/476/3744https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/476/3744https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/476/3744http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/476/3744GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/476/3744/hix-2 (Basic properties and measurements for the HIX and control galaxy sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/3744/hix-2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/3744/hix-2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/3744/hix-2?GETtext/xml+votable180.050000true2.07816194-59.515633060.005555555555555556Cone search capability for table J/MNRAS/476/3744/list (List of datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/476/3744/list?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/476/3744/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/476/3744/list?GETtext/xml+votable180.050000true62.92917-70.233060.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/476/37446/33156 34910 34944 35207 35351 35746 35938 37624 38139 38355 38466 38655 38956 39038 43726 43826-43827 45301 45806 46363 46466 46723 47951https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/476/3744?format=asciiRadiodefaultJ/MNRAS/476/3744/hix-2Basic properties and measurements for the HIX and control galaxy samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the galaxymeta.id;meta.maincharRAJ2000Rigth ascension from 2MASX (J2000)degpos.eq.ra;meta.mainDEJ2000Declination from 2MASX (J2000)degpos.eq.dec;meta.mainDistDistance based on recession velocityMpcpos.distancedoublelogMstarstellar masslog(solMass)phys.massfloatlogMHIhHI mass based on HIPASS datalog(solMass)phys.massfloatlogMHIaHI mass based on ATCA datalog(solMass)phys.massfloatReffKKs band effective radius from 2MASX (Skrutskie et al., 2006, Cat. VII/233) converted to kpc assuming the distance abovekpcphys.size.radiusfloatRHI1M_{sun}_/pc^2^ isophotal radius of HI disckpcphys.size.radiusfloatVrotRotation velocity from tilted ring modelskm/sphys.veloc.rotatfloatjHIHI specific angular momentumkpc.km/sphys.angMomentumdoublejstarStellar specific angular momentumkpc.km/sphys.angMomentumdoublejbaryBaryonic specific angular momentumkpc.km/sphys.angMomentumdoublelogqStability parameterstat.fit.paramfloatlambdaHalo spin parameterstat.fit.paramfloatH/c[H/c] Which sample does the galaxy belong to (H=HIX, c=control)meta.codecharn_H/cNote on H/cmeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/476/3744/listList of datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyName of the galaxymeta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of pixels along Z-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablebVlsrLower value of LSR velocity (FELO-LSR)m/sphys.veloc;pos.lsrdoubleBVlsrupper value of LSR velocity (FELO-LSR)m/sphys.veloc;pos.lsrdoubledVlsrLSR velocity resolutionm/sspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlchar