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arXiv:0706.0527 (astro-ph)
[Submitted on 4 Jun 2007]

Title:The Discovery of 1000 km/s Outflows in Massive Post-starburst Galaxies at z=0.6

Authors:Christy A. Tremonti (1), John Moustakas (2), Aleksandar M. Diamond-Stanic (1) ((1) Steward Observatory, (2) New York University)
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Abstract: Numerical simulations suggest that active galactic nuclei (AGNs) play an important role in the formation of early-type galaxies by expelling gas and dust in powerful galactic winds and quenching star formation. However, the existence of AGN feedback capable of halting galaxy-wide star formation has yet to be observationally confirmed. To investigate this question, we have obtained spectra of 14 post-starburst galaxies at z~0.6 to search for evidence of galactic winds. In 10/14 galaxies we detect Mg II 2796,2803 absorption lines which are blueshifted by 490 - 2020 km/s with respect to the stars. The median blueshift is 1140 km/s. We hypothesize that the outflowing gas represents a fossil galactic wind launched near the peak of the galaxy's activity, a few 100 Myr ago. The velocities we measure are intermediate between those of luminous starbursts and broad absorption line quasars, which suggests that feedback from an AGN may have played a role in expelling cool gas and shutting down star formation.
Comments: 5 pages, 2 figures, accepted to ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0527 [astro-ph]
  (or arXiv:0706.0527v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0527
Related DOI: https://doi.org/10.1086/520083

Submission history

From: Christy Tremonti [view email]
[v1] Mon, 4 Jun 2007 21:36:25 UTC (60 KB)
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