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Author Nagai, H. ♦ Kino, M. ♦ Fujita, Y. ♦ Nakamura, M. ♦ Asada, K. ♦ Orienti, M. ♦ Giovannini, G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ BLACK HOLES ♦ CLOUDS ♦ ELECTRON DENSITY ♦ ELECTRONS ♦ EMISSION ♦ FARADAY EFFECT ♦ GALAXIES ♦ GHZ RANGE ♦ INTERACTIONS ♦ LIMBS ♦ MAGNETIC FIELD CONFIGURATIONS ♦ MAGNETIC FIELDS ♦ POLARIZATION ♦ ROTATION ♦ SPHERICAL CONFIGURATION
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) × 10{sup 5} rad m{sup −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 × 10{sup 4} cm{sup −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.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-11-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 849
Issue Number 1


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