Observing Star Formation Quenching In Action: A Powerful [ne V] Outflow In A Post-starburst Radio Galaxy

Type Conference Paper
Names John Chisholm, C. Tremonti, T. Heckman, Y. Chen, G. Kauffmann, K. Schawinski, M. Strauss
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, AAS Meeting #219, #246.22
Volume 219
Date January 1, 2012
Short Title Observing Star Formation Quenching In Action
URL http://adsabs.harvard.edu/abs/2012AAS...21924622C
Library Catalog NASA ADS
Abstract A crucial question in galaxy evolution is how star formation is quenched to form massive red sequence galaxies. We have recently identified an unusual post-starburst radio galaxy at z = 0.94 in the SDSS-III's Baryon Oscillation Spectroscopic Survey. The galaxy has anomalously strong [OIII], [Ne III] and [Ne V] emission lines, with velocities extending out to -3000km/s. The SDSS-III spectrum and imaging data lead us to suggest two possible scenarios for these anomalous lines: the end of a relatively short lived, but extremely energetic phase of AGN-driven gas expulsion, or a chance alignment of an AGN radio jet and a gas-rich companion. We analyze longslit spectra obtained with the Robert Stobie Spectrograph on the South African Large Telescope to help distinguish between the proposed scenarios and gain insights into the physical mechanisms responsible for AGN-driven gas expulsion.
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