Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-07-20
Astronomy and Astrophysics
Astrophysics
7 pages with embedded b/w figures. To be published in the proceedings of "Extragalactic Jets: Theory and Observation from Radi
Scientific paper
We review the recent data on the knot HST-1 in the M87 jet in the context of typical blazar behavior. In particular we discuss the wide-band flare of 2005 which peaked at a factor of 50 to 80 times the intensity observed in 2000; the superluminal radio features; and the arguments that support the hypothesis that HST-1 was the source of the excess TeV emission found by H.E.S.S. in 2005. To the extent that M87 can be classified as a blazar, perhaps observed at a somewhat larger angle to the line of sight compared to most blazars, all of these blazar properties originate at a distance greater than 100 pc from the nucleus, and thus cannot be associated with the location of the 'launching of the jet'.
Biretta John A.
Cheung Charlotte
Harris Daniel E.
Perlman Eric Steven
Sparks William
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