J/A+A/586/A60 PKS 1502+106 15, 43 and 86GHz images (Karamanavis+, 2016)
PKS 1502+106: A high-redshift Fermi blazar at extreme angular resolution.
Structural dynamics with VLBI imaging up to 86 GHz.
Karamanavis V., Fuhrmann L., Krichbaum T.P., Angelakis E., Hodgson J.,
Nestoras I., Myserlis I., Zensus J.A., Sievers A., Ciprini S.
<Astron. Astrophys. 586, A60 (2016)>
=2016A&A...586A..60K 2016A&A...586A..60K (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; VLBI
Keywords: galaxies: active - galaxies: jets -
quasars: individual: PKS 1502+106 -
radiation mechanisms: non-thermal - radio continuum: galaxies -
gamma rays: galaxies
Abstract:
Blazars are among the most energetic objects in the Universe. In 2008
August, Fermi/LAT detected the blazar PKS 1502+106, which showed 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 that also covered 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.
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.
We used ultra-high angular resolution mm-VLBI observations at 43 and
86GHz complemented by VLBI observations at 15GHz. We also employed
single-dish radio data from the F-GAMMA program at frequencies
matching the VLBI monitoring.
PKS 1502+106 shows a compact core-jet morphology and fast superluminal
motion with apparent speeds in the range 5-22c. Estimating Doppler
factors along the jet yields values of 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 θ∼3° and the latter at θ∼1°, after the
jet bends towards the observer beyond 1mas. The de-projected opening
angle of the ultra-fast magnetically dominated jet is found to be
(3.8±0.5)°. 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 ≤5.9pc away from the
jet base.
Description:
Uniformly weighted, VLBI MODELFIT images of PKS 1502+106 at 15GHz (19
epochs), 43GHz (6 epochs), and 86GHz (6 epochs). Entries correspond
to Figs. 1, 2, and 3 of the paper.
Objects:
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RA (2000) DE Designation(s)
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15 04 24.98 +10 29 39.2 PKS 1502+106 = QSO J1504+1029
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list15.dat 94 19 List of FITS images at 15GHz
list43.dat 94 6 List of FITS images at 43GHz
list86.dat 94 6 List of FITS images at 86GHz
15GHz/* . 19 Individual VLBI FITS images at 15GHz
43GHz/* . 6 Individual VLBI FITS images at 43GHz
86GHz/* . 6 Individual VLBI FITS images at 86GHz
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Byte-by-byte Description of file: list15.dat list43.dat list86.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx [1024] Number of pixels along X-axis
24 A1 --- --- [x]
25- 28 I4 --- Ny [1024] Number of pixels along Y-axis
30- 35 F6.3 GHz Freq Frequency (15, 43 or 86)
37- 46 A10 "YYYY-MM-DD" Obs.Date Observation date
48- 50 F3.1 Mbyte size Size of FITS file
52- 68 A17 --- FileName Name of FITS file with the subdirectory name
70- 94 A25 --- Title Title of the file
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Acknowledgements:
Vassilis Karamanavis, vkaramanavis(at)mpifr-bonn.mpg.de
This research has made use of data at 15 GHz from the MOJAVE database
that is maintained by the MOJAVE team (Lister et al.,
2009AJ....137.3718L 2009AJ....137.3718L, Cat. J/AJ/137/3118)
(End) Vassilis Karamanavis [MPIfR, Germany], Patricia Vannier [CDS] 15-Dec-2015