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http://hdl.handle.net/20.500.12386/31838
Titolo: | A persistent double nuclear structure in 3C 84 | Autori: | Oh, Junghwan Hodgson, Jeffrey A. Trippe, Sascha Krichbaum, Thomas P. Kam, Minchul Paraschos, Georgios Filippos Kim, Jae-Young Rani, Bindu Sohn, Bong Won Lee, Sang-Sung LICO, Rocco LIUZZO, Elisabetta Teodorina Bremer, Michael Zensus, Anton |
Data pubblicazione: | 2022 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 509 | Fascicolo: | 1 | Da pagina:: | 1024 | Abstract: | 3C 84 (NGC 1275) is the radio source at the centre of the Perseus cluster and exhibits a bright radio jet. We observed the source with the Global Millimeter VLBI Array (GMVA) between 2008 and 2015, with a typical angular resolution of ~50 $\mu$as. The observations revealed a consistent double nuclear structure separated by ~770 gravitational radii assuming a black hole mass of 3.2 × 10<SUP>8</SUP> M<SUB>⊙</SUB>. The region is likely too broad and bright to be the true jet base anchored in the accretion disc or black hole ergosphere. A cone and parabola were fit to the stacked (time averaged) image of the nuclear region. The data did not strongly prefer either fit, but combined with a jet/counter-jet ratio analysis, an upper limit on the viewing angle to the inner jet region of ≤35° was found. This provides evidence for a variation of the viewing angle along the jet (and therefore a bent jet) within ~0.5 pc of the jet launching region. In the case of a conical jet, the apex is located ~2400 gravitational radii upstream of the bright nuclear region and up to ~600 gravitational radii upstream in the parabolic case. We found a possible correlation between the brightness temperature and relative position angle of the double nuclear components, which may indicate rotation within the jet. | URI: | http://hdl.handle.net/20.500.12386/31838 | URL: | https://academic.oup.com/mnras/article/509/1/1024/6412543?login=true http://arxiv.org/abs/2110.09811v1 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab3056 | Bibcode ADS: | 2022MNRAS.509.1024O | Fulltext: | open |
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