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.
|Number of pages||20|
|Journal||Monthly Notices of the Royal Astronomical Society|
|Early online date||29 Jan 2018|
|Publication status||Published - 1 May 2018|
- galaxies: evolution
- galaxies: active
- galaxies: kinematics and dynamics
- galaxies: dwarf
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Supermassive black holes prevent stars forming in some smaller galaxies
Bob Nichol, Samantha Penny & Karen Masters
10/01/18 → 11/01/18
4 Media contributions
Press/Media: Research cited