Journal Article

Radio emission and active galactic nucleus feedback in post-starburst galaxies

Min-Su Shin, Michael A. Strauss and Rita Tojeiro

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 410, issue 3, pages 1583-1592
Published in print January 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17541.x
Radio emission and active galactic nucleus feedback in post-starburst galaxies

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We investigate radio-mode AGN activity among post-starburst galaxies from the Sloan Digital Sky Survey (SDSS) to determine whether AGN feedback may be responsible for the cessation of star formation. Based on radio morphology and radio loudness from the FIRST and NVSS data, we separate objects with radio activity due to an AGN from ongoing residual star formation. Of 513 SDSS galaxies with strong A-star spectra, 12 objects have 21-cm flux density above 1 mJy. These galaxies do not show optical AGN emission lines. Considering that the lifetime of radio emission is much shorter than the typical time-scale of the spectroscopic features of post-starburst galaxies, we conclude that the radio-emitting AGN activity in these objects was triggered after the end of the recent starburst, and thus cannot be an important feedback process to explain the post-starburst phase. The radio luminosities show a positive correlation with total galaxy stellar mass, but not with the mass of recently formed stars. Thus the mechanical power of AGN feedback derived from the radio luminosity is related to old stellar populations dominating the stellar mass, which in turn are related to the masses of central supermassive black holes.

Keywords: galaxies: evolution; galaxies: fundamental parameters; galaxies: jets; galaxies: stellar content; radio continuum: general

Journal Article.  6276 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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