Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..419..369t&link_type=abstract
Galaxy Evolution: Emerging Insights and Future Challenges ASP Conference Series, Vol. 419, proceedings of a conference held 11-1
Astronomy and Astrophysics
Astronomy
Scientific paper
In many modern theoretical models quasar feedback is invoked to drive gas and dust from galaxies and abruptly quench star formation. However, this idea has yet to be observationally confirmed. To gain insight into the role and relative importance of quasar feedback we are studying a sample of 35 massive post-starburst galaxies at z˜0.6. These objects are the likely remnants of major mergers, observed a few hundred million years after the peak of their star formation and quasar activity. In two-thirds of the sample we detect Mg II absorption lines that are blueshifted by 500-2400 km s-1 with respect to the host galaxy. These fossil galactic winds are significantly faster than winds observed in starburst galaxies. We estimate the mass and energy of the outflows and conclude that quasar feedback played a role in expelling the cool gas and quenching star formation.
Diamond-Stanic Aleksandar M.
Moustakas John
Tremonti Christy
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