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The SAMI Galaxy Survey : spatially resolving the main sequence of star formation

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Medling_2018_SAMI_Galaxy_MNRAS_5194.pdf (4.663Mb)
Date
21/04/2018
Author
Medling, Anne M.
Cortese, Luca
Croom, Scott M.
Green, Andrew W.
Groves, Brent
Hampton, Elise
Ho, I-Ting
Davies, Luke J. M.
Kewley, Lisa J.
Moffett, Amanda J.
Schaefer, Adam L.
Taylor, Edward
Zafar, Tayyaba
Bekki, Kenji
Bland-Hawthorn, Joss
Bloom, Jessica V.
Brough, Sarah
Bryant, Julia J.
Catinella, Barbara
Cecil, Gerald
Colless, Matthew
Couch, Warrick J.
Drinkwater, Michael J.
Driver, Simon P.
Federrath, Christoph
Foster, Caroline
Goldstein, Gregory
Goodwin, Michael
Hopkins, Andrew
Lawrence, J. S.
Leslie, Sarah K.
Lewis, Geraint F.
Lorente, Nuria P. F.
Owers, Matt S.
McDermid, Richard
Richards, Samuel N.
Sharp, Robert
Scott, Nicholas
Sweet, Sarah M.
Taranu, Dan S.
Tescari, Edoardo
Tonini, Chiara
Sande, Jesse van de
Walcher, C. Jakob
Wright, Angus
Keywords
Surveys
Galaxies: evolution
Galaxies: star formation
QB Astronomy
QC Physics
DAS
Metadata
Show full item record
Abstract
We present the ∼800 star formation rate maps for the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey based on H α emission maps, corrected for dust attenuation via the Balmer decrement, that are included in the SAMI Public Data Release 1. We mask out spaxels contaminated by non-stellar emission using the [O iii]/H β, [N ii]/H α, [S ii]/H α, and [O i]/H α line ratios. Using these maps, we examine the global and resolved star-forming main sequences of SAMI galaxies as a function of morphology, environmental density, and stellar mass. Galaxies further below the star-forming main sequence are more likely to have flatter star formation profiles. Early-type galaxies split into two populations with similar stellar masses and central stellar mass surface densities. The main-sequence population has centrally concentrated star formation similar to late-type galaxies, while galaxies >3σ below the main sequence show significantly reduced star formation most strikingly in the nuclear regions. The split populations support a two-step quenching mechanism, wherein halo mass first cuts off the gas supply and remaining gas continues to form stars until the local stellar mass surface density can stabilize the reduced remaining fuel against further star formation. Across all morphologies, galaxies in denser environments show a decreased specific star formation rate from the outside in, supporting an environmental cause for quenching, such as ram-pressure stripping or galaxy interactions.
Citation
Medling , A M , Cortese , L , Croom , S M , Green , A W , Groves , B , Hampton , E , Ho , I-T , Davies , L J M , Kewley , L J , Moffett , A J , Schaefer , A L , Taylor , E , Zafar , T , Bekki , K , Bland-Hawthorn , J , Bloom , J V , Brough , S , Bryant , J J , Catinella , B , Cecil , G , Colless , M , Couch , W J , Drinkwater , M J , Driver , S P , Federrath , C , Foster , C , Goldstein , G , Goodwin , M , Hopkins , A , Lawrence , J S , Leslie , S K , Lewis , G F , Lorente , N P F , Owers , M S , McDermid , R , Richards , S N , Sharp , R , Scott , N , Sweet , S M , Taranu , D S , Tescari , E , Tonini , C , Sande , J V D , Walcher , C J & Wright , A 2018 , ' The SAMI Galaxy Survey : spatially resolving the main sequence of star formation ' Monthly Notices of the Royal Astronomical Society , vol 475 , no. 4 , pp. 5194-5214 . DOI: 10.1093/mnras/sty127
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
http://dx.doi.org/10.1093/mnras/sty127
ISSN
0035-8711
Type
Journal article
Rights
© 2018, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty127
Collections
  • Physics & Astronomy Research
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12963

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