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Spatially resolved ...
Spatially resolved origin of millimeter-wave linear polarization in the nuclear region of 3C 84
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- Kim, J. Y. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Krichbaum, T.P. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Marscher, A. (författare)
- Boston University
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- Jorstad, S.G. (författare)
- Boston University,Saint Petersburg State University - Spsu
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- Agudo, I. (författare)
- Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)
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Thum, C. (författare)
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- Hodgson, J. (författare)
- Korea Astronomy and Space Science Institute
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- Macdonald, N. R. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Ros, Eduardo (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Lu, R.S. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Shanghai Astronomical Observatory. Chinese Academy of Sciences,Shanghai Astronomical Observatory Chinese Academy of Sciences
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- Bremer, M. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Vicente, P. de (författare)
- Observatorio de Yebes (IGN),Yebes Observatory
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- Lindqvist, Michael, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Trippe, S. (författare)
- Seoul National University
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- Zensus, A.J. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Max Planck Gesellschaft zur Förderung der Wissenschaften eV. (MPG) Boston University (creator_code:org_t)
- 2019-02-19
- 2019
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 622
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://www.aanda.or...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- We report results from a deep polarization imaging of the nearby radio galaxy 3C 84 (NGC 1275). The source was observed with the Global Millimeter VLBI Array (GMVA) at 86 GHz at an ultrahigh angular resolution of 50 μas (corresponding to ∼200Rs). We also add complementary multiwavelength data from the Very Long Baseline Array (VLBA; 15 and 43 GHz) and from the Atacama Large Millimeter/submillimeter Array (ALMA; 97.5, 233.0 and 343.5 GHz). At 86 GHz, we measured a fractional linear polarization of ∼2% in the VLBI core region. The polarization morphology suggests that the emission is associated with an underlying limb-brightened jet. The fractional linear polarization is lower at 43 and 15 GHz (∼0.3-0.7% and <0.1%, respectively). This suggests an increasing linear polarization degree toward shorter wavelengths on VLBI scales. We also obtain a large rotation measure (RM) of ∼10 5-6 rad m 2 in the core at 43 GHz. Moreover, the VLBA 43 GHz observations show a variable RM in the VLBI core region during a small flare in 2015. Faraday depolarization and Faraday conversion in an inhomogeneous and mildly relativistic plasma could explain the observed linear polarization characteristics and the previously measured frequency dependence of the circular polarization. Our Faraday depolarization modeling suggests that the RM most likely originates from an external screen with a highly uniform RM distribution. To explain the large RM value, the uniform RM distribution and the RM variability, we suggest that the Faraday rotation is caused by a boundary layer in a transversely stratified jet. Based on the RM and the synchrotron spectrum of the core, we provide an estimate for the magnetic field strength and the electron density of the jet plasma.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- Galaxies: individual: NGC 1275
- Techniques: interferometric
- Galaxies: active
- Galaxies: jets
- Techniques: polarimetric
- Galaxies: individual: 3C 84
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Kim, J. Y.
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Krichbaum, T.P.
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Marscher, A.
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Jorstad, S.G.
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Agudo, I.
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Thum, C.
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visa fler...
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Hodgson, J.
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Macdonald, N. R.
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Ros, Eduardo
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Lu, R.S.
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Bremer, M.
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Vicente, P. de
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Lindqvist, Micha ...
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Trippe, S.
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Zensus, A.J.
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visa färre...
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