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A tale of two feedbacks: star formation in the host galaxies of radio AGNs

Karouzos, Marios; Im, Myungshin; Trichas, Markos; Goto, Tomo; Malkan, Matt; Ruiz, Angel; Jeon, Yiseul; Kim, Ji Hoon; Lee, Hyung Mok; Kim, Seong Jin; Oi, Nagisa; Matsuhara, Hideo; Takagi, Toshinobu; Murata, K.; Wada, Takehiko; Wada, Kensuke; Shim, Hyunjin; Hanami, Hitoshi; Serjeant, Stephen; White, Glenn J.; Pearson, Chris and Ohyama, Youichi (2014). A tale of two feedbacks: star formation in the host galaxies of radio AGNs. Astrophysical Journal, 784(2), article no. 137.

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Several lines of argument support the existence of a link between activity at the nuclei of galaxies, in the form of an accreting supermassive black hole, and star formation activity in these galaxies. Radio jets have long been argued to be an ideal mechanism that allows active galactic nuclei (AGNs) to interact with their host galaxies and affect star formation. We use a sample of radio sources in the North Ecliptic Pole (NEP) field to study the nature of this putative link, by means of spectral energy distribution (SED) fitting. We employ the excellent spectral coverage of the AKARI infrared space telescope and the rich ancillary data available in the NEP to build SEDs extending from UV to far-IR wavelengths. We find a significant AGN component in our sample of relatively faint radio sources (<mJy). A positive correlation is found between the luminosity of the AGN component and that of star formation in the host galaxy, independent of the radio luminosity. In contrast, for narrow redshift and AGN luminosity ranges, we find that increasing radio luminosity leads to a decrease in the specific star formation rate. The most radio-loud AGNs are found to lie on the main sequence of star formation for their respective redshifts. For the first time, we potentially see such a two-sided feedback process in the same sample. We discuss the possible suppression of star formation, but not total quenching, in systems with strong radio jets, that supports the maintenance nature of feedback from radio AGN jets.

Item Type: Journal Item
Copyright Holders: 2014 The American Astronomical Society
ISSN: 1538-4357
Keywords: active galaxies; galactic evolution; jets; star formation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 39845
Depositing User: G. J. White
Date Deposited: 01 Apr 2014 09:53
Last Modified: 07 Dec 2018 15:48
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