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COLA. III. RADIO DETECTION OF ACTIVE GALACTIC NUCLEUS IN COMPACT MODERATE LUMINOSITY INFRARED GALAXIES

Rodrigo Parra (Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik) ; John Conway (Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik) ; Susanne Aalto (Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik) ; P. N. Appleton ; R. P. Norris ; Y. M. Pihlstrom ; L. J. Kewley
Astrophysical Journal (0004-637X). Vol. 720 (2010), 1, p. 555-568.
[Artikel, refereegranskad vetenskaplig]

We present results from 4.8 GHz Very Large Array (VLA) and global very long baseline interferometry (VLBI) observations of the northern half of the moderate FIR luminosity (median L-IR = 10(11.01) L-circle dot) COLA sample of star-forming galaxies. VLBI sources are detected in a high fraction (20/90) of the galaxies observed. The radio luminosities of these cores (similar to 10(21) W Hz(-1)) are too large to be explained by radio supernovae or supernova remnants and we argue that they are instead powered by active galactic nuclei (AGNs). These sub-parsec scale radio cores are preferentially detected toward galaxies whose VLA maps show bright 100-500 parsec scale nuclear radio components. Since these latter structures tightly follow the FIR to radio-continuum correlation for star formation, we conclude that the AGN-powered VLBI sources are associated with compact nuclear starburst environments. The implications for possible starburst-AGN connections are discussed. The detected VLBI sources have a relatively narrow range of radio luminosity consistent with models in which intense compact Eddington-limited starbursts regulate the gas supply onto a central supermassive black hole. The high incidence of AGN radio cores in compact starbursts suggests little or no delay between the starburst phase and the onset of AGN activity.

Nyckelord: galaxies: active, galaxies: starburst, infrared: galaxies, radio, continuum: galaxies, starburst-agn connection, black-hole, supernova-remnants, host, galaxies, emission, arp-220, classification, line, spectra, sample



Denna post skapades 2010-09-30. Senast ändrad 2014-09-02.
CPL Pubid: 127125

 

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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik (2005-2010)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur