Hidden Star Formation in E+A Galaxies
Nielsen, Danielle ( NOAO/CTIO, Chile ); de Propris, R. ( NOAO/CTIO, Chile ); Ridgway, S. E. ( NOAO/CTIO, Chile ) show affiliations
American Astronomical Society, AAS Meeting #215, id.412.12; Bulletin of the American Astronomical Society, Vol. 42, p.248
Published in Jan 2010
We present the first results of an on-going investigation on the radio properties of E+A galaxies, to understand the role of AGN feedback in the quenching of star formation in post-starburst galaxies. We stack radio images from the FIRST, NVSS, WENSS and VLSS surveys in order to search for residual star formation, nuclear activity and ancient radio lobes in these galaxies. In all cases we see no evidence of signal in the stacked images. We derive upper limits to the mean emission from E+A galaxies at 1.4 Ghz, 325 Mhz and 74 Mhz using FIRST/NVSS/WENSS/ VLSS stacks of 10,000 white dwarfs and creating 10,000 stacks equivalent to our E+A stacks to estimate the mean error by Monte Carlo simulations. Our first results indicate an upper limit to the star formation rate of 0.5 solar masses per year in E+A galaxies, suggesting that star formation is these galaxies has been terminated.