k+a galaxies and the starburst - AGN connection

Details k+a galaxies and the starburst - AGN connection k+a galaxies and the starburst - AGN connection

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50207r&link_type=abstract

Spitzer Proposal ID #50207

Computer Science

Scientific paper

k+a galaxies represent a short-lived post-starburst phase in which a galaxy goes from a period of high levels of star formation to quiescence in only a matter of a few Gyr. Of interest is the discovery that many k+a galaxies harbor AGN. Given that the quenching of star formation via AGN feedback is considered a vital component in models of galaxy formation at high-z, although as yet uncofirmed, observing low redshift analogues in the form of k+a galaxies should give us valuable insights into this process, if it exists. Here we propose to observe 12 nearby (z<0.2) galaxies which are known to be in a post-starburst phase from their optical spectra. The selection is grouped into three sub-classes which map out a range of times across the post-starburst phase. The aim is to identify what, if any, contribution AGN has to their mid-ir flux, and to then track the evolution of AGN activity with time. This should give constraints on the timescales and effeciency of AGN in quenching star formation.

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