Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924622c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #246.22
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Chen Yafeng
Chisholm John
Heckman Tim
Kauffmann Guinevere
Schawinski Kevin
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