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The connection between the parsec-scale radio jet and γ-ray flares in the blazar 1156+295


Ramakrishnan, V and Leon-Tavares, J and Rastorgueva-Foi, EA and Wiik, K and Jorstad, SG and Marscher, AP and Tornikoski, M and Agudo, I and Lahteenmaki, A and Valtaoja, E and Aller, MF and Blinov, DA and Casadio, C and Efimova, NV and Gurwell, MA and Gomez, JL and Hagen-Thorn, VA and Joshi, M and Jarvela, E and Konstantinova, TS and Kopatskaya, EN and Larionov, VM and Larionova, EG and Larionova, LV and Lavonen, N and MacDonald, NR and McHardy, IM and Molina, SN and Morozova, DA and Nieppola, E and Tammi, J and Taylor, BW and Troitsky, IS, The connection between the parsec-scale radio jet and γ-ray flares in the blazar 1156+295, Monthly Notices of the Royal Astronomical Society, 445, (2) pp. 1636-1646. ISSN 0035-8711 (2014) [Refereed Article]


Copyright Statement

Copyright 2014 the authors

DOI: doi:10.1093/mnras/stu1873


The blazar 1156+295 was active at γ-ray energies, exhibiting three prominent flares during the year 2010. Here, we present results using the combination of broad-band (X-ray through mm single-dish) monitoring data and radio-band imaging data at 43 GHz on the connection of γ-ray events to the ejections of superluminal components and other changes in the jet of 1156+295. The kinematics of the jet over the interval 2007.02012.5 using 43 GHz Very Long Baseline Array observations reveal the presence of four moving and one stationary component in the inner region of the blazar jet. The propagation of the third and fourth components in the jet corresponds closely in time to the active phase of the source in γ-rays. We briefly discuss the implications of the structural changes in the jet for the mechanism of γ-ray production during bright flares. To localize the γ-ray emission site in the blazar, we performed the correlation analysis between the 43 GHz radio core and the γ-ray light curve. The time lag obtained from the correlation constrains the γ-ray emitting region in the parsec-scale jet.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active, galaxies: jets, quasars: individual: 1156+295, gamma-rays: galaxies, radio continuum: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Rastorgueva-Foi, EA (Dr Elizaveta Rastorgueva-Foi)
ID Code:98162
Year Published:2014
Web of Science® Times Cited:17
Deposited By:Mathematics and Physics
Deposited On:2015-02-03
Last Modified:2015-04-27
Downloads:360 View Download Statistics

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