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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28045
Title: Enhanced Polarized Emission from the One-parsec-scale Hotspot of 3C 84 as a Result of the Interaction with the Clumpy Ambient Medium
Authors: Nagai, H.
Fujita, Y.
Nakamura, M.
ORIENTI, Monica 
Kino, M.
Asada, K.
Giovannini, Gabriele 
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 849
Issue: 1
First Page: 52
Abstract: We present Very Long Baseline Array polarimetric observations of the innermost jet of 3C 84 (NGC 1275) at 43 GHz. A significant polarized emission is detected at the hotspot of the innermost restarted jet, which is located 1 pc south from the radio core. While the previous report presented a hotspot at the southern end of the western limb, the hotspot location has been moved to the southern end of the eastern limb. Faraday rotation is detected within an entire bandwidth of the 43 GHz band. The measured rotation measure (RM) is at most (6.3 ± 1.9) × 105 rad m-2 and might be slightly time variable on the timescale of a month by a factor of a few. Our measured RM and the RM previously reported by the CARMA and SMA observations cannot be consistently explained by the spherical accretion flow with a power-law profile. We propose that a clumpy/inhomogeneous ambient medium is responsible for the observed RM. Using an equipartition magnetic field, we derive the electron density of 2 × 104 cm-3. Such an electron density is consistent with the cloud of the narrow line emission region around the central engine. We also discuss the magnetic field configuration from the black hole scale to the parsec scale and the origin of low polarization.
URI: http://hdl.handle.net/20.500.12386/28045
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aa8e43
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aa8e43
Bibcode ADS: 2017ApJ...849...52N
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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