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dc.contributor.authorde los Reyes, Mithi A. C.
dc.contributor.authorKennicutt, Robert C.
dc.date.accessioned2019-06-06T23:19:25Z
dc.date.available2019-06-06T23:19:25Z
dc.date.issued2019-02-10
dc.identifier.citationMithi A. C. de los Reyes and Robert C. Kennicutt Jr. 2019 ApJ 872 16en_US
dc.identifier.issn1538-4357
dc.identifier.doi10.3847/1538-4357/aafa82
dc.identifier.urihttp://hdl.handle.net/10150/632534
dc.description.abstractWe use new and updated gas- and dust-corrected star formation rate (SFR) surface densities to revisit the integrated star formation law for local "quiescent" spiral, dwarf, and low surface brightness galaxies. Using UV-based SFRs with individual IR-based dust corrections, we find that "normal" spiral galaxies alone define a tight Sigma((H I+ H2))-Sigma(SFR) relation described by an n = 1.41(-0).(+0.07)(07) power law with a dispersion of 0.28(-0.02)(+0.02) (errors reflect fitting and statistical uncertainties). The SFR surface densities are only weakly correlated with H I surface densities alone, exhibiting a stronger and roughly linear correlation with H-2 surface densities, similar to what is seen in spatially resolved measurements of disks. However, many dwarf galaxies lie below the star formation law defined by spirals, suggesting a low-density threshold in the integrated star formation law. We consider alternative scaling laws that better describe both spirals and dwarfs. Our improved measurement precision also allows us to determine that much of the scatter in the star formation law is intrinsic, and we search for correlations between this intrinsic scatter and secondary physical parameters. We find that dwarf galaxies exhibit second-order correlations with the total gas fraction, stellar mass surface density, and dynamical time, which may explain much of the scatter in the star formation law. Finally, we discuss various systematic uncertainties that should be kept in mind when interpreting any study of the star formation law, particularly the X(CO) conversion factor and the diameter chosen to define the star-forming disk in a galaxy.en_US
dc.description.sponsorshipSTFC; Winston Churchill Foundation; NSF Graduate Research Fellowship Programen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/0004-637X/872/i=1/a=16?key=crossref.b10f112e73db63ffdc0f1cb3f4e44c46en_US
dc.rights© 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectgalaxies: dwarfen_US
dc.subjectgalaxies: spiralen_US
dc.subjectgalaxies: star formationen_US
dc.titleRevisiting the Integrated Star Formation Law. I. Non-starbursting Galaxiesen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume872
dc.source.issue1
dc.source.beginpage16
refterms.dateFOA2019-06-06T23:19:26Z


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