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The central pc-scale region in blazars: insights from multi-band observations

Published online by Cambridge University Press:  25 July 2014

Tigran G. Arshakian  and
Vahram Chavushyan
Tigran G. Arshakian
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany email: arshakian@ph1.uni-koeln.de Byurakan Astrophysical Obsevatory, Aragatsotn province 0213, Armenia
Vahram Chavushyan
Affiliation:
Instituto Nacional de Astrofísica, Óptica y Electrónica, Apartado Postal 51 y 216, 72000 Puebla, Pue, México
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Abstract

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The empirical relations in the black hole-accretion disk-relativistic jet system and physical processes behind these relations are still poorly understood, partly because they operate close to the black hole within the central light year. Very long baseline array (VLBA) provides unparalleled resolution at 15 GHz with which to observe the jet components at sub-milliarcsecond scales, corresponding to sub-pc-scales for local blazars. We discuss the jet inner structure of blazars, location and radiation mechanisms operating in the innermost parsec-scale region of blazars, and evidence for jet-excited broad-line region (BLR) ouflowing downstream the jet. Outflowing BLR can provide necessary conditions for production of high energy emission along the jet between the base of the jet and the BLR and far beyond the BLR as evidenced by recent observations. Flat spectrum quasars and low synchrotron peaked sources are the most likely objects to host the outfllowing BLR. From the γ-ray absorption arguments, we propose that the jet-excited region of the outflowing BLR in quasars is small and/or gas filling factor is low, and that the orientation and opening angle of the outflowing BLR can lead to relevant γ-ray absorption features observed in quasars.

Keywords

active galactic nuclei: individual (BL Lacertae)galaxies: activegalaxies: jetsradio continuum: galaxiesquasars: generalgamma rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 257 - 260
Copyright
Copyright © International Astronomical Union 2014 

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