Extreme Gas Fractions in Clumpy, Turbulent Disk Galaxies at Z Similar To 0.1

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dc.contributor.utaustinauthorCooper, Erin Mentuchen_US
dc.creatorFisher, David B.en_US
dc.creatorGlazebrook, Karlen_US
dc.creatorBolatto, Albertoen_US
dc.creatorObreschkow, Danailen_US
dc.creatorCooper, Erin Mentuchen_US
dc.creatorWisnioski, Emilyen_US
dc.creatorBassett, Roberten_US
dc.creatorAbraham, Roberto G.en_US
dc.creatorDamjanov, Ivanaen_US
dc.creatorGreen, Andyen_US
dc.creatorMcGregor, Peteren_US
dc.date.accessioned2016-10-28T19:38:11Z
dc.date.available2016-10-28T19:38:11Z
dc.date.issued2014-08en_US
dc.description.abstractIn this Letter, we report the discovery of CO fluxes, suggesting very high gas fractions in three disk galaxies seen in the nearby universe (z similar to 0.1). These galaxies were investigated as part of the DYnamics of Newly Assembled Massive Objects (DYNAMO) survey. High-resolution Hubble Space Telescope imaging of these objects reveals the presence of large star forming clumps in the bodies of the galaxies, while spatially resolved spectroscopy of redshifted II alpha reveals the presence of high dispersion rotating disks. The internal dynamical state of these galaxies resembles that of disk systems seen at much higher redshifts (1 < z < 3). Using CO(1-0) observations made with the Plateau de Bure Interferometer, we find gas fractions of 20%-30% and depletion times of t(dep) similar to 0.5 Gyr (assuming aMilky-Way-like alpha(CO)). These properties are unlike those expected for low-redshift galaxies of comparable specific star Formation rate, but they are normal for their high-z counterparts. DYNAMO galaxies break the degeneracy between gas fraction and redshift, and we show that the depletion time per specific star Formation rate for galaxies is closely tied to gas fraction, independent of redshift. We also show that the gas dynamics of two of our local targets corresponds to those expected from unstable disks, again resembling the dynamics of high-z disks. These results provide evidence that DYNAMO galaxies are local analogs to the clumpy, turbulent disks, which are often found at high redshift.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipINSU/CNRS (France)en_US
dc.description.sponsorshipMPG (Germany)en_US
dc.description.sponsorshipIGN (Spain)en_US
dc.description.sponsorshipAustralian Research Council (ARC) Discovery Program (DP) DP130101460en_US
dc.description.sponsorshipCAREER AST 08-38178, AST 09-55836en_US
dc.description.sponsorshipResearch Corporation for Science Advancementen_US
dc.identifierdoi:10.15781/T2KH0F22R
dc.identifier.citationFisher, David B., Karl Glazebrook, Alberto Bolatto, Danail Obreschkow, Erin Mentuch Cooper, Emily Wisnioski, Robert Bassett et al. "Extreme gas fractions in clumpy, turbulent disk galaxies at z~ 0.1." The Astrophysical Journal Letters, Vol. 790, No. 2 (Aug., 2014): L30.en_US
dc.identifier.doi10.1088/2041-8205/790/2/l30en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43102
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectgalaxies: evolutionen_US
dc.subjectgalaxies: ismen_US
dc.subjectgalaxies: starbursten_US
dc.subjectgalaxies: staren_US
dc.subjectFormationen_US
dc.subjectstar-forming galaxiesen_US
dc.subjecthigh-redshift galaxiesen_US
dc.subjectiram legacy surveyen_US
dc.subjectmolecular gasen_US
dc.subjectmassive galaxiesen_US
dc.subjectFormation efficiencyen_US
dc.subjectFormationen_US
dc.subjecthistoryen_US
dc.subjectscaling relationsen_US
dc.subjectdepletion timeen_US
dc.subjectsins surveyen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleExtreme Gas Fractions in Clumpy, Turbulent Disk Galaxies at Z Similar To 0.1en_US
dc.typeArticleen_US

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