The SAMI Galaxy Survey

spatially resolving the environmental quenching of star formation in GAMA galaxies

A. L. Schaefer*, S. M. Croom, P. Norberg, M. Alpaslan, A. E. Bauer, K. Bekki, J. Bland-Hawthorn, J. V. Bloom, J. J. Bryant, W. J. Couch, S. P. Driver, L. M. R. Fogarty, J. T. Allen, C. Foster, G. Goldstein, A. W. Green, A. M. Hopkins, I. S. Konstantopoulos, J. S. Lawrence, A. R. López-Sánchez & 15 others N. P. F. Lorente, M. S. Owers, R. Sharp, S. Brough, S. M. Sweet, E. N. Taylor, J. van de Sande, C. J. Walcher, O. I. Wong, A. M. Medling, I. -T. Ho, N. Scott, S. N. Richards, M. B. Pracy, M. L. P. Gunawardhana

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

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 Hα 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 (Σ5; 10⁻¹˙³–10²˙¹Mpc⁻²). We show that star formation rate gradients in galaxies are steeper in dense (log₁₀(Σ₅/Mpc²) > 0.5) environments by 0.58±0.29dex rₑ⁻¹ in galaxies with stellar masses in the range 10¹⁰ 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.
Original languageEnglish
Pages (from-to)121-142
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume464
Issue number1
DOIs
Publication statusPublished - Jan 2017

Keywords

  • galaxies: evolution
  • galaxies: general
  • galaxies: interactions
  • galaxies: statistics
  • galaxies: stellar content
  • galaxies: structure

Cite this

Schaefer, A. L., Croom, S. M., Norberg, P., Alpaslan, M., Bauer, A. E., Bekki, K., ... Gunawardhana, M. L. P. (2017). The SAMI Galaxy Survey: spatially resolving the environmental quenching of star formation in GAMA galaxies. Monthly Notices of the Royal Astronomical Society, 464(1), 121-142. https://doi.org/10.1093/mnras/stw2289