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Multifrequency VLBI follow up study of strong γ-ray flares in the blazars 3C273 and 3C279

Published online by Cambridge University Press:  24 March 2015

Mikhail M. Lisakov  and
Yuri Y. Kovalev
Mikhail M. Lisakov
Affiliation:
Astro Space Center of Lebedev Physical Institute, 84/32 Profsoyuznaya st., Moscow, 117997, Russia email: lisakov@asc.rssi.ru, yyk@asc.rssi.ru
Yuri Y. Kovalev
Affiliation:
Astro Space Center of Lebedev Physical Institute, 84/32 Profsoyuznaya st., Moscow, 117997, Russia email: lisakov@asc.rssi.ru, yyk@asc.rssi.ru
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Abstract

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We present multifrequency VLBI observations of the blazars 3C273 and 3C279 after detecting strong γ-ray flares in both of them. 3C273 exhibited a prominent flare in γ-rays in September 2009 which was followed by a strong flare in the 7 mm VLBI core and emergence of a new feature in the parsec scale jet. We have used time delay between flares in different wavebands together with kinematic analysis to determine that the γ-ray emission zone in 3C273 is located 3.6-5.3 pc upstream from the apparent 7 mm core. We have also analyzed frequency dependent core position to measure a deprojected distance between 7 mm core and the true base of the jet: 1-6 pc for 3C273 and 1-3 pc for 3C279, depending on observing epoch. For 3C279 light curve analysis did not give a robust γ-radio delay because there were too many overlapping flares in this source during considered period.

Keywords

techniques: interferometricradio continuum: galaxies(galaxies:) quasars: individual (3C273, 3C279)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S313: Extragalactic jets from every angle , September 2014 , pp. 39 - 42
Copyright
Copyright © International Astronomical Union 2015 

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