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Determining the average SFR of K+A galaxies

Published online by Cambridge University Press:  17 August 2012

Danielle M. Nielsen ,
Roberto de Propris ,
Susan E. Ridgway  and
Tomotsugu Goto
Danielle M. Nielsen
Affiliation:
Dept. of Astronomy, University of Wisconsin – Madison475 N. Charter Street, Madison, WI 53706, USA
Roberto de Propris
Affiliation:
Cerro Tololo Inter-American Observatory, La Serena, Chile
Susan E. Ridgway
Affiliation:
National Optical Astronomy Observatory, 950 N. Cherry Avenue, Tucson, AZ 85719, USA
Tomotsugu Goto
Affiliation:
Subaru Telescope, Hilo, HI, USA email: nielsen@astro.wisc.edu
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Abstract

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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.

Keywords

galaxies: starburstradio continuum
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 468 - 470
Copyright
Copyright © International Astronomical Union 2012

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