2012A&A...537A..70S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:01:06

2012A&A...537A..70S - Astronomy and Astrophysics, volume 537A, 70-70 (2012/1-1)

Relativistic outflow drives γ-ray emission in 3C 345.

SCHINZEL F.K., LOBANOV A.P., TAYLOR G.B., JORSTAD S.G., MARSCHER A.P. and ZENSUS J.A.

Abstract (from CDS):

On the basis of the first 20 months of Fermi-LAT data and optical monitoring, the quasar 3C345 has been identified as a γ-ray emitter. We investigate whether there is a connection between the γ-ray and optical variability of 3C345 and the properties of its parsec-scale radio emission. We combined the Fermi-LAT data of 3C345, covering an energy range of 0.1-300GeV, with 32 Very Long Baseline Array observations of the object made at 43.2GHz in the period of January 2008-March 2010. The VLBA data reveal the morphology and kinematics of the flow on scales of up to ≃5 milliarcseconds (deprojected linear distances of 380 parsecs). The brightness temperature, Tb(r), measured along the jet first decreases with distance ∝ r–(0.95±0.69) and later exhibits a break at≃0.3 milliarcseconds (mas), with Tb(r)∝r–(4.11±0.85) at larger separations. Variations in the γ-ray, optical, and parsec-scale radio emission display a similar long-term trend that persists during the entire VLBA monitoring period. The γ-ray and optical variations on shorter timescales are related to structural changes in the jet on scales of ≃0.3mas (≃23parsecs, deprojected), with the γ-ray and optical flares possibly being related to the evolution of four distinct superluminal components identified in the flow. The observations indicate that both the quiescent and flaring components of the γ-ray emission are produced in a region of the jet that extends up to ∼23pc. This region may correspond to the Compton-loss dominated zone of the flow and its large extent may favor the synchrotron self-Compton mechanism for γ-ray production in the relativistic jet of the quasar 3C345.

Abstract Copyright:

Journal keyword(s): galaxies: jets - galaxies: active - radio continuum: galaxies - gamma rays: galaxies - Galaxy: nucleus - galaxies: individual: 3C 345

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1871 2
2 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2060 1
3 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2752 2
4 7C 1308+3236 BLL 13 10 28.66387 +32 20 43.7831   15.61 15.24 17.91   ~ 760 1
5 7C 130838.79+324935.00 QSO 13 10 59.40272936 +32 33 34.4496333     16.8 19.00   ~ 75 1
6 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 693 2
7 QSO J1512-0906 Bla 15 12 50.53292491 -09 05 59.8295878   16.74 16.54     ~ 1180 1
8 QSO B1640+396 QSO 16 41 47.5394411699 +39 35 03.328547314   20.01 19.83     ~ 59 1
9 3C 345 QSO 16 42 58.8100340220 +39 48 36.999540578   16.81 16.59 16.84   ~ 1574 2
10 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1229 0
11 4C 11.69 QSO 22 32 36.40890517 +11 43 50.9040717   17.75 17.33     ~ 1001 2

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:01:06

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