The Gamma-ray Activity of the high-z Quasar 0836+71

Svetlana Jorstad, Alan Marscher, Valeri Larionov, José L. Gómez, Iván Agudo, Emmanouil Angelakis, Carolina Casadio, Mark Gurwell, Talvikki Hovatta, Manasvita Joshi, Lars Fuhrmann, Vassilis Karamanavis, Anne Lähteenmäki, Sol Molina, Daria Morozova, Ioannis Myserlis, Ivan Troitsky, Hans Ungerechts, J.Anton Zensus

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

7 Citations (Scopus)
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The Fermi LAT detected an increase in γ-ray activity of the quasar 0836+710 (z=2.17) in Spring 2011 that culminated in a sharp γ-ray flare at the end of 2011 when the source reached a flux of 2.9×10−6 phot s−1cm−2 at 0.1-200 GeV. We monitor the quasar at optical wavelengths in photometric and polarimetric modes, at millimeter and centimeter wavelengths, and with the VLBA at 43 GHz. The optical brightness of the quasar increased by ~0.5 mag in R band and the degree of polarization oscillated between ~1% and ~6% during the highest γ-ray state, while the position angle of polarization rotated by ~300°. We have identified in the VLBA images a strong, highly polarized component that moves with an apparent speed of ~20 c. The component emerged from the core in the beginning of the γ-ray event and reached a flux maximum at the peak of the γ-ray outburst. We present the results of a correlative analysis of variations at different wavelengths along with the kinematic parameters of the parsec scale jet. We discuss the location of the high γ-ray emission in the relativistic jet, as well as the emission mechanisms responsible for γ-ray production.
Original languageEnglish
Title of host publicationThe Innermost Regions of Relativistic Jets and Their Magnetic Fields
EditorsJosé L. Gómez
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
EventThe Innermost Regions of Relativistic Jets and their Magnetic Fields - Nazaries Hotel, Granada, Spain
Duration: 10 Jun 201314 Jun 2013

Publication series

NameEPJ Web of Conferences
PublisherEDP Sciences
ISSN (Electronic)2100-014X


ConferenceThe Innermost Regions of Relativistic Jets and their Magnetic Fields
Abbreviated titleJETS


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