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Unveiling the AGN in IC 883: discovery of a parsec-scale radio jet

C. Romero-Canizales ; A. Alberdi ; C. Ricci ; P. Arevalo ; M. A. Perez-Torres ; John Conway (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; R. J. Beswick ; M. Bondi ; T. W. B. Muxlow ; M. K. Argo ; F. E. Bauer ; A. Efstathiou ; R. Herrero-Illana ; S. Mattila ; S. D. Ryder
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 467 (2017), 2, p. 2504-2516.
[Artikel, refereegranskad vetenskaplig]

IC 883 is a luminous infrared galaxy (LIRG) classified as a starburst- active galactic nucleus (AGN) composite. In a previous study, we detected a low- luminosity AGN (LLAGN) radio candidate. Here, we report on our radio follow- up at three frequencies that provides direct and unequivocal evidence of the AGN activity in IC 883. Our analysis of archival X-ray data, together with the detection of a transient radio source with luminosity typical of bright supernovae, gives further evidence of the ongoing star formation activity, which dominates the energetics of the system. At sub- parsec scales, the radio nucleus has a core-jet morphology with the jet being a newly ejected component showing a subluminal proper motion of 0.6-1 c. The AGN contributes less than 2 per cent of the total IR luminosity of the system. The corresponding Eddington factor is similar to 10(-3), suggesting this is a low-accretion rate engine, as often found in LLAGNs. However, its high bolometric luminosity (similar to 10(44) erg s(-1)) agrees better with a normal AGN. This apparent discrepancy may just be an indication of the transition nature of the nucleus from a system dominated by star formation, to an AGN-dominated system. The nucleus has a strongly inverted spectrum and a turnover at similar to 4.4 GHz, thus qualifying as a candidate for the least luminous (L(5.0)GHz similar to 6.3 x 10(28) erg s(-1) Hz(-1)) and one of the youngest (similar to 3 x 10(3) yr) gigahertz-peaked spectrum (GPS) sources. If the GPS origin for the IC 883 nucleus is confirmed, then advanced mergers in the LIRG category are potentially key environments to unveil the evolution of GPS sources into more powerful radio galaxies.

Nyckelord: galaxies: active, galaxies: individual: IC 883, galaxies: jets, galaxies: nuclei, radio continuum: galaxies



Denna post skapades 2017-05-05. Senast ändrad 2017-05-18.
CPL Pubid: 249124

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Advanced Radio Astronomy in Europe (RADIONET3) (EC/FP7/283393)