SDSS-IV MaNGA: evidence of the importance of AGN feedback in low-mass galaxies

Samantha J. Penny, Karen L. Masters, Rebecca Smethurst, Robert C. Nichol, Coleman M. Krawczyk, Dmitry Bizyaev, Olivia Greene, Charles Liu, Mariarosa Marinelli, Sandro B. Rembold, Rogemar A. Riffel, Gabriele Da Silva Ilha, Dominika Wylezalek, Brett H. Andrews, Kevin Bundy, Niv Drory, Daniel Oravetz, Kaike Pan

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Abstract

We present new evidence for AGN feedback in a subset of 69 quenched low-mass galaxies (M⋆ ≲ 5 × 109 M⊙, Mr > −19) selected from the first two years of the SDSS-IV MaNGA survey. The majority (85 per cent) of these quenched galaxies appear to reside in a group environment. We find 6 galaxies in our sample that appear to have an active AGN that is preventing on-going star-formation; this is the first time such a feedback mechanism has been observed in this mass range. Interestingly, five of these six galaxies have an ionised gas component that is kinematically offset from their stellar component, suggesting the gas is either recently accreted or outflowing. We hypothesise these six galaxies are low-mass equivalents to the “red geysers” observed in more massive galaxies. Of the other 62 galaxies in the sample, we find 8 do appear for have some low-level, residual star formation, or emission from hot, evolved stars. The remaining galaxies in our sample have no detectable ionised gas emission throughout their structures, consistent with them being quenched. This work shows the potential for understanding the detailed physical properties of dwarf galaxies through spatially resolved spectroscopy.
Original languageEnglish
Pages (from-to)979-998
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume476
Issue number1
Early online date29 Jan 2018
DOIs
Publication statusPublished - 1 May 2018

Keywords

  • galaxies: evolution
  • galaxies: active
  • galaxies: kinematics and dynamics
  • galaxies: dwarf

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