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Paper: Empirical Evidence for Quasar Feedback
Volume: 419, Galaxy Evolution: Emerging Insights and Future Challenges
Page: 369
Authors: Tremonti, C.; Diamond-Stanic, A. M.; Moustakas, J.
Abstract: 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.
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