J/ApJ/733/87ivo://CDS.VizieR/J/ApJ/733/87doi:10.26093/cds/vizier.17330087CDSShi Y.Helou G.Yan L.Armus L.Wu Y.Papovich C.Stierwalt S.2017-12-22T05:32:26Z2012-12-10T07:43:16ZCDS support team

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

cds-question@unistra.frgalaxiesradio-astronomyWe propose an "extended Schmidt law" with explicit dependence of the star formation efficiency (SFE=SFR/M_gas_) on the stellar mass surface density ({Sigma}_star_). This relation has a power-law index of 0.48+/-0.04 and a 1{sigma} observed scatter on the SFE of 0.4 dex, which holds over five orders of magnitude in the stellar density for individual global galaxies, including various types and especially the low-surface-brightness (LSB) galaxies that deviate significantly from the Kennicutt-Schmidt (KS) law. When applying it to regions of a sample of 12 spiral galaxies at sub-kiloparsec resolution, the extended Schmidt law not only holds for LSB regions but also shows significantly smaller scatters both within and across galaxies compared with the KS law. We argue that this new relation points to the role of existing stars in regulating the SFE, thus better encoding the star formation physics. Comparison with physical models of star formation recipes shows that the extended Schmidt law can be reproduced by some models including gas free fall in a stellar-gravitational potential and pressure-supported star formation. By implementing this new law into the analytic model of gas accretion in {Lambda}CDM, we show that it can reproduce the observed main sequence of star-forming galaxies (a relation between the SFR and stellar mass) from z=0 up to z=2.2011ApJ...733...87Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/733/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/708/841 : Star formation in E/S0 galaxies (Wei+, 2010)J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/733/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/733/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/733/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/733/87https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/733/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/733/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/733/87/table1 (Samples with CO and HI data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/733/87/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/733/87/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/733/87/table1?GETtext/xml+votable180.050000true10.684708341.268750.0055555555555555566/664 2155 2320 2372 2709 3389 4522 4554 4691 4695 4811 5124 5129 5131 5202 5288 5468 5492 5572 5581 5596 5617 5715 5751 5966 6034 6968 7241 7385 7424 7602 7604 7606 7624 7743 7799 7956 8113 8359 8455 8557 8673 8827 8846 9190 9272 9437 9640 10144 10475 10841 10843 10856 10911 10977 11026 11027 11101 11252 11424 11425 11434 11596 11639 12122 13522 15592 16120 16441 16755 18325 18398 19619 19682 26303 26331 26365 26432 27030 27468 27512 27514 27603 27617 27728 27731 27757 27763 27773 27830 27857 27861 27907 27914 27917 27918 27937 27938 27942 27944 27945 27955 28015 28035 28045 28054 28102 28107 28149 28167 28200 28230 28334 28346 28524 28631 31158 43881https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/733/87?format=asciiRadiodefaultJ/ApJ/733/87/table1Samples with CO and HI dataSimbadNameSimbad column added by the CDSmeta.idcharNameGalaxy namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeGalaxy type in this paper (1)src.classcharz[-0.0011/3.41] Redshiftsrc.redshiftdoubleDist[0.78/29645] Distance used in this workMpcpos.distance;pos.heliocentricdoubleApAperture definition (2)phys.angSize;instr.fovAreaDe-projected area used to derive surface densitieskpc**2phys.angSizedoublelogSigSFRLog star formation rate surface densitylog(solMass.yr**-1.kpc**-2)phys.SFRfloatlogSigGLog of gas surface densitylog(solMass.pc**-2)phys.densityfloatRefReference(s) for SFR and gas surface density data (3)meta.ref;pos.framecharlogSig*Log of stellar mass surface densitylog(solMass.pc**-2)phys.densityfloatBandWavelength band used to measure stellar massmeta.code;instr.filtercharRef*[2/18] Reference for stellar mass (3)meta.ref;pos.framechar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main