The SAMI Galaxy Survey : spatially resolving the environmental quenching of star formation in GAMA galaxies
MetadataShow full item record
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 H α 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 –1010.95 M⊙ ) and in fifth nearest neighbour local environment density (Σ5;10−1.3 –102.1 Mpc−2 ). We show that star formation rate gradients in galaxies are steeper in dense (log10(Σ5/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(Σ5/Mpc2) < 0.0) to 30 ± 15 per cent in the highest density environments (log10(Σ5/Mpc 2) > 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.
Schaefer , A L , Croom , S M , Allen , J T , Brough , S , Medling , A M , Ho , I -T , Scott , N , Richards , S N , Pracy , M B , Gunawardhana , M L P , Norberg , P , Alpaslan , M , Bauer , A E , Bekki , K , Bland-Hawthorn , J , Bloom , J V , Bryant , J J , Couch , W J , Driver , S P , Fogarty , L M R , Foster , C , Goldstein , G , Green , A W , Hopkins , A M , Konstantopoulos , I S , Lawrence , J S , López-Sánchez , A R , Lorente , N P F , Owers , M S , Sharp , R , Sweet , S M , Taylor , E N , Sande , J V D , Walcher , C J & Wong , O I 2017 , ' The SAMI Galaxy Survey : spatially resolving the environmental quenching of star formation in GAMA galaxies ' Monthly Notices of the Royal Astronomical Society , vol 464 , no. 1 , pp. 121-142 . DOI: 10.1093/mnras/stw2289
Monthly Notices of the Royal Astronomical Society
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stw2289
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Showing items related by title, author, creator and subject.
Mendez Abreu, Jairo; Debattista, V. P.; Corsini, E. M.; Aguerri, J. A. L. (2014-12) - Journal articleContext. Historically, galaxy bulges were thought to be single-component objects at the center of galaxies. However, this picture is now questioned since different bulge types with different formation paths, namely classical ...
Galaxy And Mass Assembly (GAMA) : mass-size relations of z < 0.1 galaxies subdivided by Sérsic index, colour and morphology Lange, Rebecca; Driver, Simon P.; Robotham, Aaron S. G.; Kelvin, Lee S.; Graham, Alister W.; Alpaslan, Mehmet; Andrews, Stephen K.; Baldry, Ivan K.; Bamford, Steven; Bland-Hawthorn, Joss; Brough, Sarah; Cluver, Michelle E.; Conselice, Christopher J.; Davies, Luke J. M.; Haeussler, Boris; Konstantopoulos, Iraklis S.; Loveday, Jon; Moffett, Amanda J.; Norberg, Peder; Phillipps, Steven; Taylor, Edward N.; Lopez-Sanchez, Angel R.; Wilkins, Stephen M. (2015-03-01) - Journal articleWe use data from the Galaxy And Mass Assembly (GAMA) survey in the redshift range 0.01 < z < 0.1 (8399 galaxies in g to Ks bands) to derive the stellar mass–half-light radius relations for various divisions of ‘early’- and ...
Galaxy And Mass Assembly (GAMA) : the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph Vulcani, Benedetta; Bamford, Steven P.; Haeussler, Boris; Vika, Marina; Rojas, Alex; Agius, Nicola K.; Baldry, Ivan; Bauer, Amanda E.; Brown, Michael J. I.; Driver, Simon; Graham, Alister W.; Kelvin, Lee S.; Liske, Jochen; Loveday, Jon; Popescu, Cristina C.; Robotham, Aaron S. G.; Tuffs, Richard J. (2014-06) - Journal articleWe investigate the relationship between colour and structure within galaxies using a large, volume-limited sample of bright, low-redshift galaxies with optical-near-infrared imaging from the Galaxy And Mass Assembly survey. ...