Journal Article

Fast TeV variability from misaligned minijets in the jet of M87

Dimitrios Giannios, Dmitri A. Uzdensky and Mitchell C. Begelman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 3, pages 1649-1656
Published in print March 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI:
Fast TeV variability from misaligned minijets in the jet of M87

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The jet of the radio galaxy M87 is misaligned, resulting in a Doppler factor δ∼ 1 for emission of plasma moving parallel to the jet. This makes the observed fast TeV flares on time-scales of tv∼ 5Rg/c harder to understand as emission from the jet. In previous work, we have proposed a jets-in-a-jet model for the ultrafast TeV flares with tvRg/c seen in Mrk 501 and PKS 2155−304. Here, we show that about half of the minijets beam their emission outside the jet cone. Minijets emitting off the jet axis result in rapidly evolving TeV (and maybe lower energy) flares that can be observed in nearby radio galaxies. The TeV flaring from M87 fits well into this picture, if M87 is a misaligned blazar.

Keywords: radiation mechanisms: non-thermal; galaxies: active; galaxies: individual: M87; galaxies: jets; gamma-rays: theory

Journal Article.  7753 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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