Determining the average SFR of K+A galaxies

Type Conference Paper
Names Danielle M. Nielsen, Roberto de Propris, Susan E. Ridgway, Tomotsugu Goto
Proceedings Title Proceedings of the International Astronomical Union
Conference Name The Spectral Energy Distribution of Galaxies
Volume 284
Pages 468-470
Date August 1, 2012
DOI 10.1017/S1743921312009647
ISBN 1743-9221
URL http://adsabs.org/2012IAUS.284.468N
Library Catalog labs.adsabs.harvard.edu
Abstract We stack FIRST survey cutout images of 811 K+A galaxies to derive a mean 1.4 GHz radio image of our sample from which we measure a mean K+A flux density of 56 μJy. We carry out Monte Carlo simulations by randomly selecting radio-quiet white dwarfs to create 10,000 stacks equivalent to our K+A stack. From the measured fluxes of these stacks, we establish a 5σ detection limit of 43 μJy for stacked images. For the average redshift of our sample, we find an mean star formation rate of ~1.7 M⊙ yr-1. We split the sample by age and find a mean radio flux of 60 μJy, which corresponds to a star formation rate of 1.6 M⊙ yr-1, for galaxies with starburst ages less than 250 Myr.
Tags Radio Continuum, galaxies: starburst
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