J/ApJ/805/31ivo://CDS.VizieR/J/ApJ/805/31doi:10.26093/cds/vizier.18050031CDSLiu L.Gao Y.Greve T.R.2017-06-21T08:22:55Z2015-10-21T10:02:57ZCDS support team

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

cds-question@unistra.frgalaxiesradio-continuum-emissioninfrared-sourcesWe study the global star formation law --the relation between gas and star formation (SF) rates-- in a sample of 181 local galaxies with infrared (IR) luminosities spanning almost five orders of magnitude (10^7.8^-10^12.3^L_{sun}_), which includes 115 normal spiral galaxies and 66 (ultra)luminous IR galaxies ((U)LIRGs, L_IR_>>10^11^L_{sun}_). We derive their atomic, molecular gas, and dense molecular gas masses using newly available HI, CO, and HCN data from the literature, and SF rates are determined both from total IR (8-1000um) and 1.4GHz radio continuum (RC) luminosities. In order to derive the disk-averaged surface densities of gas and SF rates, we have taken a novel approach and used high-resolution RC observations to measure the radio sizes for all 181 galaxies. In our sample, we find that the surface density of dense molecular gas (as traced by HCN) has the tightest correlation with that of SF rates ({Sigma}_SFR_), and is linear in log-log space (power-law slope of N=1.01+/-0.02) across the full galaxy sample. The correlation between surface densities of molecular gas ({Sigma}_H_2__, traced by CO) and {Sigma}_SFR_ is sensitive to the adopted value of the CO-to-H_2_ conversion factor ({alpha}_CO_) used to infer molecular gas masses from CO luminosities. For a fixed Galactic value of {alpha}_CO_, a power law index of 1.14+/-0.02 is found. If instead we adopt values for {alpha}_CO_ of 4.6 and 0.8 for disk galaxies and (U)LIRGs, respectively, we find the two galaxy populations separate into two distinct {Sigma}_SFR_ versus {Sigma}_H_2__ relations. Finally, applying a continuously varying {alpha}_CO_ to our sample, we recover a single {Sigma}_SFR_-{Sigma}_H_2__ relation with slope of 1.60+/-0.03. The {Sigma}_SFR_ is a steeper function of total gas {Sigma}_gas_ (molecular gas with atomic gas) than that of molecular gas {Sigma}_H_2__, and are tighter among low-luminosity galaxies. We find no correlation between global surface densities of SFRs and atomic gas (HI).2015ApJ...805...31Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/805/31CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989)II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies (Hunter+, 2012)J/ApJ/723/993 : Spatial extent of (U)LIRGs in the MIR. I. (Diaz-Santos+, 2010)J/A+A/522/A3 : M33 CO(2-1) and HI integrated intensity maps (Gratier+, 2010)J/ApJ/704/842 : VIRUS-P spectroscopy of NGC 5194 (Blanc+, 2009)J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008)J/ApJ/671/333 : Aperture photometry in NGC 5194 (Kennicutt+, 2007)J/A+A/462/507 : AMIGA III. IRAS data (Lisenfeld+, 2007)J/A+A/462/81 : L_IR_-T_dust_ relation in galaxies (Chanial+, 2007)J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002)J/ApJ/554/803 : New VLA Sky Survey (NVSS) of IRAS 2 Jy Galaxies (Yun+ 2001)J/A+AS/131/73 : Catalogue of HI maps of galaxies. I. (Martin 1998)J/A+AS/115/439 : CO survey of galaxies (Elfhag+, 1996)J/A+AS/115/407 : Short WSRT HI observations of spiral galaxies (Rhee+, 1996)J/ApJS/73/359 : 1.49 GHz atlas of the IRAS bright galaxies (Condon+, 1990)J/ApJS/65/485 : 1.49GHz Atlas of Spiral Galaxies (Condon, 1987)http://archive.nrao.edu/ : NRAO archive home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/805/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/805/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/805/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/805/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/805/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/805/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/805/31/galaxies (Luminosities and surface densities of the local galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/805/31/galaxies?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/805/31/galaxies?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/805/31/galaxies?GETtext/xml+votable180.050000true7.5912208-33.245350.0055555555555555566/430 650 664 700 941 1918 2155 2320 2363 2372 2409 2518 3299 3389 3506 3824 3910 3934 4511 4869 4993 5200 5202 5288 5429 5492 5523 5572 5581 5596 5816 5966 5995 6034 6098 6348 7132 7241 7424 7552 7602 7606 7659 7728 7743 8106 8173 8225 8266 8482 8673 9133 9437 10281 10364 10465 10475 10761 10817 10841 10856 10977 11027 11029 11101 11206 11246 11434 11446 11639 12122 12537 13021 13522 13632 13925 15323 15592 15955 16120 16453 16470 16650 16655 16755 17183 17506 17748 17754 17755 17904 18212 18387 18398 18932 19283 20000 20014 20060 20061 20254 21016 21991 22468 22654 22721 23178 24584 25344 25599 25946 26298 26303 26331 26365 26811 27030 27135 27512 27514 27537 27603 27728 27731 27757 27763 27773 27857 27861 27907 27914 27917 27918 27931 27937 27942 27944 27945 27955 28015 28035 28045 28054 28167 28184 28393 28524 28529 29439 29795 30383 30822 31081 31158 31454 32715 34273 34531 35993 36796 37128 37559 38139 38786 40124 43233 43881 43925 44896 46399 46811 46882 47078 47854https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/805/31?format=asciiInfraredRadiodefaultJ/ApJ/805/31/galaxiesLuminosities and surface densities of the local galaxiesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeGalaxy type: "Normal" Galaxies or "(U)LIRG" = (ultra)luminous IR Galaxysrc.classcharNameIdentifiermeta.id;meta.maincharDist[0.8/313.6] DistanceMpcpos.distance;pos.heliocentricfloatLCO[0.01/226.5] The CO line luminosity1e+08K.km.s**-1phys.luminosityfloatLHCN[0.02/50.6]? The HCN line luminosity1e+08K.km.s**-1phys.luminosityfloatnullableLIR[7.8/12.5] Total 8-1000 micron luminositysolLumphys.luminosity;em.IRfloatLRC[-6.4/864] The 1.4GHz radio continuum luminosity (in 10^+21^W.Hz^-1^)ZW/Hzphys.luminosityfloatRefLuminosity references (see refs.dat file)meta.ref;phys.luminositycharDiam1Diameter (deconvolved major axes)arcsecphys.angSizefloatDiam2? Second diameter for interacting galaxies (1)arcsecphys.angSizefloatnullablelogSHI[-0.6/1.3]? Log HI atomic surface densitylog(solMass.pc**-2)phot.flux.density.sb;em.line.HIfloatnullablelogSH2a[-0.4/6.1] Log molecular H_2_ gas mass surface density (2)log(solMass.pc**-2)phys.densityfloatlogSH2b[-0.2/4.9] Log molecular H_2_ gas mass surface density (3)log(solMass.pc**-2)phys.densityfloatlogSgas[-0.2/6.1] Log total gas surface densitylog(solMass.pc**-2)phot.flux.density.sbfloatlogSden[-0.5/5.5]? Log dense molecular gas surface densitylog(solMass.pc**-2)phot.flux.density.sbfloatnullablelogSIR[-2.8/3.9] Star formation rate from 8-1000{mu}mlog(solMass.yr**-1.kpc**-2)phys.SFRfloatlogSRC[-3.2/3.6] Star formation rate from 1.4GHz radio continuumlog(solMass.yr**-1.kpc**-2)phys.SFRfloatRef2References (see refs.dat file)meta.ref;pos.framecharNRAOProject code(s) in NRAO archive (4)meta.id;obscharNVSSSources within 20" from NVSS (Condon+, 1998, VIII/65)meta.ref.urlintnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/805/31/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/140] Reference code (1)meta.noteintBibCodeBibcodemeta.bib.bibcodecharAuthFirst author's name(s)meta.bib.authorcharCommCommentmeta.notechar