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PKS 1502+106: A high-redshift Fermi blazar at extreme angular resolution. Structural dynamics with VLBI imaging up to 86 GHz | | V. Karamanavis
; L. Fuhrmann
; T. P. Krichbaum
; E. Angelakis
; J. Hodgson
; I. Nestoras
; I. Myserlis
; J. A. Zensus
; A. Sievers
; S. Ciprini
; | | Date: |
3 Nov 2015 | | Abstract: | Context. Blazars are among the most energetic objects in the Universe. In
2008 August, Fermi/LAT detected the blazar PKS 1502+106 showing a rapid and
strong gamma-ray outburst followed by high and variable flux over the next
months. This activity at high energies triggered an intensive multi-wavelength
campaign covering also the radio, optical, UV, and X-ray bands indicating that
the flare was accompanied by a simultaneous outburst at optical/UV/X-rays and a
delayed outburst at radio bands.
Aims: In the current work we explore the phenomenology and physical
conditions within the ultra-relativistic jet of the gamma-ray blazar PKS
1502+106. Additionally, we address the question of the spatial localization of
the MeV/GeV-emitting region of the source.
Methods: We utilize ultra-high angular resolution mm-VLBI observations at 43
and 86 GHz complemented by VLBI observations at 15 GHz. We also employ
single-dish radio data from the F-GAMMA program at frequencies matching the
VLBI monitoring.
Results: PKS 1502+106 shows a compact core-jet morphology and fast
superluminal motion with apparent speeds in the range 5--22 c. Estimation of
Doppler factors along the jet yield values between ~7 up to ~50. This Doppler
factor gradient implies an accelerating jet. The viewing angle towards the
source differs between the inner and outer jet, with the former at ~3 degrees
and the latter at ~1 degree, after the jet bends towards the observer beyond 1
mas. The de-projected opening angle of the ultra-fast, magnetically-dominated
jet is found to be (3.8 +/- 0.5) degrees. A single jet component can be
associated with the pronounced flare both at high-energies and in radio bands.
Finally, the gamma-ray emission region is localized at less than 5.9 pc away
from the jet base. | | Source: | arXiv, 1511.1085 | | Services: | Forum | Review | PDF | Favorites | |
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