A gamma-ray emission zone in 3C 279 Virtual Observatory Resource

Authors
  1. Patino-Alvarez V.M.
  2. Dzib S.A.
  3. Lobanov A.
  4. Chavushyan V.
  5. Published by
    CDS
Abstract

We investigate the relationship between the variable gamma-ray emission and jet properties in the blazar 3C 279, by combining the Fermi/LAT data spanning a period of eight years with concurrent radio measurements made at multiple epochs with VLBA at 15 and 43 GHz within the MOJAVE and VLBA-BU monitoring programs. The aim of this paper is to compare the flux variability of the different components found in the VLBA observations, to the variability in the gamma-rays. This analysis helps to investigate whether any of the jet components can be associated with the gamma-ray variability. Through Spearman rank correlation we found that the gamma-ray variability is correlated with a particular region (feature B, in the MOJAVE images) downstream from the observed base (core) of the jet. This jet component is therefore a likely location at which an important fraction of the variable gamma-ray emission is produced. We also calculated the average proper motion of the component with respect to the VLBA core and found that it moves at an apparent superluminal velocity of (3.70+/-0.35)c, implying that one of the gamma-ray emission zones is not stationary. This jet component is also found between 6.86mas and 8.68mas, which translates to a distance from the radio core of at least 42pc.

Keywords
  1. active-galactic-nuclei
  2. gamma-ray-astronomy
  3. interferometry
  4. radio-sources
Bibliographic source Bibcode
2019A&A...630A..56P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A56
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/630/A56
Document Object Identifer DOI
doi:10.26093/cds/vizier.36300056

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History

2019-09-23T08:42:22Z
Resource record created
2019-09-23T08:03:53Z
Updated
2019-09-23T08:42:22Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr