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PAGAN II: THE EVOLUTION OF AGN JETS ON SUB-PARSEC SCALES
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 Title & Authors
PAGAN II: THE EVOLUTION OF AGN JETS ON SUB-PARSEC SCALES
OH, JUNGHWAN; TRIPPE, SASCHA; KANG, SINCHEOL; KIM, JAE-YOUNG; PARK, JONG-HO; LEE, TAESEOK; KIM, DAEWON; KINO, MOTOKI; LEE, SANG-SUNG; SOHN, BONG WON;
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 Abstract
We report first results from KVN and VERA Array (KaVA) VLBI observations obtained in the frame of our Plasma-physics of Active Galactic Nuclei (PAGaN) project. We observed eight selected AGN at 22 and 43 GHz in single polarization (LCP) between March 2014 and April 2015. Each source was observed for 6 to 8 hours per observing run to maximize the uv coverage. We obtained a total of 15 deep high-resolution images permitting the identification of individual circular Gaussian jet components and three spectral index maps of BL Lac, 3C 111 and 3C 345 from simultaneous dual-frequency observations. The spectral index maps show trends in agreement with general expectations – flat core and steep jets – while the actual value of the spectral index for jets shows indications for a dependence on AGN type. We analyzed the kinematics of jet components of BL Lac and 3C 111, detecting superluminal proper motions with maximum apparent speeds of about 5c. This constrains the lower limits of the intrinsic component velocities to ~ 0.98c and the upper limits of the angle between jet and line of sight to ~20°. In agreement with global jet expansion, jet components show systematically larger diameters d at larger core distances r, following the global relation d ≈ 0.2r, albeit within substantial scatter.
 Keywords
galaxies: active;jets —radio continuum: galaxies —techniques: interferometric;
 Language
English
 Cited by
1.
PAGAN I: MULTI-FREQUENCY POLARIMETRY OF AGN JETS WITH KVN,;;;;;;;;

천문학회지, 2015. vol.48. 5, pp.285-298 crossref(new window)
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