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Galaxy and mass assembly (GAMA): Dust obscuration in galaxies and their recent star formation histories

Wijesinghe, D. B.; Hopkins, Andrew M.; Sharp, Robert; Gunawardhana, M; Brough, Sarah; Sadler, Elaine M; Driver, Simon P; Baldry, I. K.; Liske, Jochen; Tuffs, Richard J; van Kampen, E

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We present self-consistent star formation rates derived through pan-spectral analysis of galaxies drawn from the Galaxy and Mass Assembly (GAMA) survey. We determine the most appropriate form of dust obscuration correction via application of a range of extinction laws drawn from the literature as applied to Hα, [O ii] and UV luminosities. These corrections are applied to a sample of 31 508 galaxies from the GAMA survey at z < 0.35. We consider several different obscuration curves, including...[Show more]

dc.contributor.authorWijesinghe, D. B.
dc.contributor.authorHopkins, Andrew M.
dc.contributor.authorSharp, Robert
dc.contributor.authorGunawardhana, M
dc.contributor.authorBrough, Sarah
dc.contributor.authorSadler, Elaine M
dc.contributor.authorDriver, Simon P
dc.contributor.authorBaldry, I. K.
dc.contributor.authorLiske, Jochen
dc.contributor.authorTuffs, Richard J
dc.contributor.authorvan Kampen, E
dc.date.accessioned2015-12-13T22:41:21Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/78464
dc.description.abstractWe present self-consistent star formation rates derived through pan-spectral analysis of galaxies drawn from the Galaxy and Mass Assembly (GAMA) survey. We determine the most appropriate form of dust obscuration correction via application of a range of extinction laws drawn from the literature as applied to Hα, [O ii] and UV luminosities. These corrections are applied to a sample of 31 508 galaxies from the GAMA survey at z < 0.35. We consider several different obscuration curves, including those of Milky Way, Calzetti and Fischera and Dopita curves and their effects on the observed luminosities. At the core of this technique is the observed Balmer decrement, and we provide a prescription to apply optimal obscuration corrections using the Balmer decrement. We carry out an analysis of the star formation history (SFH) using stellar population synthesis tools to investigate the evolutionary history of our sample of galaxies as well as to understand the effects of variation in the initial mass function (IMF) and the effects this has on the evolutionary history of galaxies. We find that the Fischera and Dopita obscuration curve with an Rv value of 4.5 gives the best agreement between the different SFR indicators. The 2200 Å feature needed to be removed from this curve to obtain complete consistency between all SFR indicators suggesting that this feature may not be common in the average integrated attenuation of galaxy emission. We also find that the UV dust obscuration is strongly dependent on the SFR.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Galaxies: evolution; Galaxies: formation; Galaxies: fundamental parameters; Galaxies: general; Galaxies: luminosity function, mass function
dc.titleGalaxy and mass assembly (GAMA): Dust obscuration in galaxies and their recent star formation histories
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume410
dc.date.issued2011
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationf5625xPUB7103
local.type.statusPublished Version
local.contributor.affiliationWijesinghe, D. B., University of Sydney
local.contributor.affiliationHopkins, Andrew M., Australian Astronomical Observatory
local.contributor.affiliationSharp, Robert, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGunawardhana, M, University of Sydney
local.contributor.affiliationBrough, Sarah, Anglo-Australian Observatory
local.contributor.affiliationSadler, Elaine M, University of Sydney
local.contributor.affiliationDriver, Simon P, University of St Andrews
local.contributor.affiliationBaldry, I. K., Liverpool John Moores University
local.contributor.affiliationLiske, Jochen, European Southern Observatory
local.contributor.affiliationTuffs, Richard J, Max Planck Institute for Nuclear Physics
local.contributor.affiliationvan Kampen, E, European Southern Observatory
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage2291
local.bibliographicCitation.lastpage2301
local.identifier.doi10.1111/j.1365-2966.2010.17599.x
dc.date.updated2016-02-24T09:33:00Z
local.identifier.scopusID2-s2.0-78751672615
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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