4.7 Article

A persistent double nuclear structure in 3C 84

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab3056

关键词

galaxies: active; quasars: individual: 3C 84; gamma-rays: galaxies; radio continuum: galaxies

资金

  1. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2021R1A6A3A01086420]
  2. Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, South Korea [2018H1D3A1A02032824, 2021R1C1C1009973]
  3. National Research Foundation of Korea (NRF) - Korea government (MIST) [2020R1A2C2009003]
  4. International Max-Planck Research School (IMPRS) for Astronomy and Astrophysics at the University of Bonn and Cologne
  5. NASA Postdoctoral Program at the Goddard Space Flight Center
  6. NASA
  7. Spanish Ministerio de Economia y Competitividad [PID2019108995GB-C21]
  8. Consejeria de Economia, Conocimiento, Empresas y Universidad, Junta de Andalucia [P18-FR-1769]
  9. Consejo Superior de Investigaciones Cientificas [2019AEP112]
  10. NRF [2019R1F1A1059721]
  11. National Research Foundation of Korea [2020R1A2C2009003, 2018H1D3A1A02032824, 2021R1C1C1009973] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

The study of 3C 84 in the Perseus cluster revealed a double nuclear structure separated by approximately 770 gravitational radii assuming a black hole mass of 3.2 x 10(8) M-circle dot. Observations and analysis found an upper limit on the viewing angle to the inner jet region of <= 35 degrees, indicating evidence of jet angle variation.
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 similar to 50 mu as. The observations revealed a consistent double nuclear structure separated by similar to 770 gravitational radii assuming a black hole mass of 3.2 x 10(8) M-circle dot. 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 degrees was found. This provides evidence for a variation of the viewing angle along the jet (and therefore a bent jet) within similar to 0.5 pc of the jet launching region. In the case of a conical jet, the apex is located similar to 2400 gravitational radii upstream of the bright nuclear region and up to similar 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.

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