J/ApJ/809/146ivo://CDS.VizieR/J/ApJ/809/146doi:10.26093/cds/vizier.18090146CDSBradford J.D.Geha M.C.Blanton M.R.2017-12-22T05:32:29Z2016-01-14T15:09:22ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyh-i-line-emissioninterstellar-mediumstellar-massesWe study the baryon content of low-mass galaxies selected from the Sloan Digital Sky Survey (SDSS DR8), focusing on galaxies in isolated environments where the complicating physics of galaxy-galaxy interactions are minimized. We measure neutral hydrogen (HI) gas masses and line widths for 148 isolated galaxies with stellar mass between 10^7^ and 10^9.5^M_{sun}_. We compare isolated low-mass galaxies to more massive galaxies and galaxies in denser environments by remeasuring HI emission lines from the Arecibo Legacy Fast ALFA survey 40% data release. All isolated low-mass galaxies either have large atomic gas fractions or large atomic gas fractions cannot be ruled out via their upper limits. We measure a median atomic gas fraction of f_gas_=0.81+/-0.13 for our isolated low-mass sample with no systems below 0.30. At all stellar masses, the correlations between galaxy radius, baryonic mass, and velocity width are not significantly affected by environment. Finally, we estimate a median baryon to total dynamical mass fraction of f_baryon,disk_=0.15+/-0.17. We also estimate two different median baryon to halo mass fractions using the results of semi-analytic models (f_baryon,disk_=0.04+/-0.06) and abundance matching (f_baryon,halo_=0.04+/-0.02). Baryon fractions estimated directly using HI observations appear independent of environment and maximum circular velocity, while baryon fractions estimated using abundance matching show a significant depletion of baryons at low maximum circular velocities.2015ApJ...809..146Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/809/146CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)VIII/77 : HI spectral properties of galaxies (Springob+, 2005)VII/198 : Mark III Catalog of Galaxy Peculiar Velocities (Willick+ 1997)J/ApJS/220/3 : SDSS-DR7 isolated galaxy morphologies (Khim+, 2015)J/AJ/147/134 : Tully-Fisher relation for S^4^G galaxies (Zaritsky+, 2014)J/A+A/564/A94 : CIG sample 3-D environment (Argudo-Fernandez+, 2014)J/A+A/560/A9 : AMIGA. Isolation degree revision (Argudo-Fernandez+, 2013)J/MNRAS/439/1015 : Velocities of red giants in LG dwarf galaxies (Kirby+, 2014)J/MNRAS/436/34 : GALEX Arecibo SDSS survey. Final release (Catinella+, 2013)J/ApJ/775/116 : z<0.06 active black hole gal. from SDSS-DR8 (Reines+, 2013)J/MNRAS/434/325 : 452 AMIGA galaxies physical param. (Fernandez Lorenzo+ 2013)J/MNRAS/425/2741 : Parameters of Spiral galaxies from SDSS 7 (Hall+, 2012)J/AJ/144/16 : Optical & HI properties of gal. in voids (Kreckel+, 2012)J/AJ/143/133 : Properties of dwarf galaxies from ALFALFA (Huang+, 2012)J/AJ/142/170 : ALFALFA survey: the {alpha}.40 HI sources (Haynes+, 2011)J/AJ/142/153 : Precision spectrophotometry at the level of 0.1% (Yan, 2011)J/A+A/534/A102 : AMIGA IX. Molecular gas properties (Lisenfeld+, 2011)J/MNRAS/415/32 : COLD GASS survey (Saintonge+, 2011)J/ApJ/726/108 : Dispersion-supported stellar systems (Tollerud+, 2011)J/MNRAS/403/683 : GALEX Arecibo SDSS survey (GASS) (Catinella+, 2010)J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)J/ApJ/653/1027 : TKRS/GOODS-N Field galaxies (Weiner+, 2006)J/ApJ/653/240 : Low-mass SDSS dwarf galaxy properties (Geha+, 2006)J/AJ/129/2062 : SDSS DR1 isolated galaxies (Allam+, 2005)J/A+A/422/941 : Gas content in 1038 interacting galaxies (Casasola+, 2004)J/AJ/128/16 : HIPASS Bright Galaxy Catalog (Koribalski+, 2004)http://www.sdss3.org/ : SDSS-III home pagehttp://www.nsatlas.org/ : NASA-Sloan Atlas home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/809/146https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/809/146http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/809/146https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/809/146https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/809/146http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/809/146GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/809/146/table1 (Isolated galaxy data sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/809/146/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/809/146/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/809/146/table1?GETtext/xml+votable180.050000true149.62595830.04520.0055555555555555565/1040 1049 1057 1072 1148 1289 2059 2079 2089 2167 2182 2234 4960 6583 6603 6608 6854 6860 6862 6885 6904 6964 7050 7056 7868 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Should Not be used for identification.meta.recordintNSA[162/171138] NASA Sloan Atlas v0.1.2 identifiermeta.idintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainDist[13/246] Heliocentric luminosity distanceMpcpos.distancefloate_Dist[1/4] Uncertainty in DistMpcstat.errorfloatInc[8/90] Inclination Angledegsrc.orbital.inclination;pos.posAngintW20i[18/1157] Inclination corrected velocity width of 21-cm line at 20% peak fluxkm/sspect.line.widthinte_W20i[0/357] Uncertainty in W20ikm/sstat.errorintReff[0.2/29.1] Effective radius at assumed distancekpcpos.distance;phys.size.radiusfloate_Reff[0.01/0.6] Uncertainty in reffkpcstat.errorfloatMHI[0.01/59.1] HI Mass1e+09solMassphys.massfloate_MHI[0.004/28] Uncertainty in MHI1e+09solMassstat.errorfloatMstar[0.007/262.3] Stellar mass1e+09solMassphys.massfloate_Mstar[0.003/121] Uncertainty in Mstar1e+09solMassstat.errorfloatRefSource of HI observations (1)meta.bibintDR9Display the SDSS-DR9 data (V/139) within 2"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar