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The SAMI Galaxy Survey: Spatially resolving the environmental quenching of star formation in GAMA galaxies

Schaefer, A L; Croom, Scott M; Allen, James T; Brough, Sarah; Medling, Anne; Ho, I-Ting; Scott, Nicholas; Richards, Samuel N.; Pracy, Michael; Gunawardhana, M.L.P.; Norberg, P; Alpaslan, M.; Sharp, Rob; Sweet, Sarah

Description

We use data from the Sydney-AAO Multi-Object Integral Field Spectrograph Galaxy Survey and the Galaxy And Mass Assembly (GAMA) survey to investigate the spatially resolved signatures of the environmental quenching of star formation in galaxies. Using dust-corrected measurements of the distribution of Ha emission, we measure the radial profiles of star formation in a sample of 201 star-forming galaxies covering three orders of magnitude in stellar mass (M*; 108.1-1010.95M⊙) and in fifth nearest...[Show more]

dc.contributor.authorSchaefer, A L
dc.contributor.authorCroom, Scott M
dc.contributor.authorAllen, James T
dc.contributor.authorBrough, Sarah
dc.contributor.authorMedling, Anne
dc.contributor.authorHo, I-Ting
dc.contributor.authorScott, Nicholas
dc.contributor.authorRichards, Samuel N.
dc.contributor.authorPracy, Michael
dc.contributor.authorGunawardhana, M.L.P.
dc.contributor.authorNorberg, P
dc.contributor.authorAlpaslan, M.
dc.contributor.authorSharp, Rob
dc.contributor.authorSweet, Sarah
dc.date.accessioned2020-12-20T20:58:11Z
dc.date.available2020-12-20T20:58:11Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/218514
dc.description.abstractWe use data from the Sydney-AAO Multi-Object Integral Field Spectrograph Galaxy Survey and the Galaxy And Mass Assembly (GAMA) survey to investigate the spatially resolved signatures of the environmental quenching of star formation in galaxies. Using dust-corrected measurements of the distribution of Ha emission, we measure the radial profiles of star formation in a sample of 201 star-forming galaxies covering three orders of magnitude in stellar mass (M*; 108.1-1010.95M⊙) and in fifth nearest neighbour local environment density (∑5; 10-1.3-102.1 Mpc-2). We show that star formation rate gradients in galaxies are steeper in dense (log10(∑5/Mpc2) > 0.5) environments by 0.58 ± 0.29 dex re-1 in galaxies with stellar masses in the range 1010 < M*/M⊙ < 1011 and that this steepening is accompanied by a reduction in the integrated star formation rate. However, for any given stellar mass or environment density, the star formation morphology of galaxies shows large scatter. We also measure the degree to which the star formation is centrally concentrated using the unitless scale-radius ratio (r50,Hα/r50,cont), which compares the extent of ongoing star formation to previous star formation. With this metric, we find that the fraction of galaxies with centrally concentrated star formation increases with environment density, from ~5 ± 4 per cent in low-density environments (log10(∑5/Mpc2) < 0.0) to 30 ± 15 per cent in the highest density environments (log10(∑5/Mpc2) > 1.0). These lines of evidence strongly suggest that with increasing local environment density, the star formation in galaxies is suppressed, and that this starts in their outskirts such that quenching occurs in an outside-in fashion in dense environments and is not instantaneous
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleThe SAMI Galaxy Survey: Spatially resolving the environmental quenching of star formation in GAMA galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume464
dc.date.issued2017
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationa383154xPUB5363
local.type.statusPublished Version
local.contributor.affiliationSchaefer, A L, University of Sydney
local.contributor.affiliationCroom, Scott M, University of Sydney
local.contributor.affiliationAllen, James T, University of Sydney
local.contributor.affiliationBrough, Sarah, Australian Astronomical Observatory
local.contributor.affiliationMedling, Anne, College of Science, ANU
local.contributor.affiliationHo, I-Ting, College of Science, ANU
local.contributor.affiliationScott, Nicholas, University of Sydney
local.contributor.affiliationRichards, Samuel N., The University of Sydney, School of Physics
local.contributor.affiliationPracy, Michael, University of Sydney
local.contributor.affiliationGunawardhana, M.L.P. , Durham University
local.contributor.affiliationNorberg, P, Durham University
local.contributor.affiliationAlpaslan, M., NASA Ames Research Centre
local.contributor.affiliationSharp, Rob, College of Science, ANU
local.contributor.affiliationSweet, Sarah, College of Science, ANU
local.bibliographicCitation.issue1
local.identifier.doi10.1093/mnras/stw2289
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-11-23T11:20:22Z
local.identifier.scopusID2-s2.0-85014748679
local.identifier.thomsonID000393646300010
CollectionsANU Research Publications

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