Massive compact galaxies with high-velocity outflows: morphological analysis and constraints on AGN activity

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Issue Date
2014-07-11Author
Sell, Paul H.
Tremonti, Christy
Hickox, Ryan C.
Diamond-Stanic, A. M.
Moustakas, J.
Coil, Alison L.
Williams, A.
Rudnick, Gregory H.
Robaina, A.
Geach, James E.
Heinz, S.
Wilcots, E. M.
Publisher
Oxford University Press
Type
Article
Article Version
Scholarly/refereed, publisher version
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Show full item recordAbstract
We investigate the process of rapid star formation quenching in a sample of 12 massive galaxies at intermediate redshift (z ∼ 0.6) that host high-velocity ionized gas outflows (v > 1000 km s−1). We conclude that these fast outflows are most likely driven by feedback from star formation rather than active galactic nuclei (AGNs). We use multiwavelength survey and targeted observations of the galaxies to assess their star formation, AGN activity, and morphology. Common attributes include diffuse tidal features indicative of recent mergers accompanied by bright, unresolved cores with effective radii less than a few hundred parsecs. The galaxies are extraordinarily compact for their stellar mass, even when compared with galaxies at z ∼ 2–3. For 9/12 galaxies, we rule out an AGN contribution to the nuclear light and hypothesize that the unresolved core comes from a compact central starburst triggered by the dissipative collapse of very gas-rich progenitor merging discs. We find evidence of AGN activity in half the sample but we argue that it accounts for only a small fraction (≲10 per cent) of the total bolometric luminosity. We find no correlation between AGN activity and outflow velocity and we conclude that the fast outflows in our galaxies are not powered by ongoing AGN activity, but rather by recent, extremely compact starbursts.
Description
This is the published version. Copyright © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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Citation
Sell, P. H., C. A. Tremonti, R. C. Hickox, A. M. Diamond-Stanic, J. Moustakas, A. Coil, A. Williams, G. Rudnick, A. Robaina, J. E. Geach, S. Heinz, and E. M. Wilcots. "Massive Compact Galaxies with High-velocity Outflows: Morphological Analysis and Constraints on AGN Activity." Monthly Notices of the Royal Astronomical Society 441.4 (2014): 3417-443. http://dx.doi.org/10.1093/mnras/stu636
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