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Title: What gamma-rays tell us about jets
Authors: Bicknell, G.V.
Safouris, V.
Saripalli, Lakshmi
Saxton, C.J.
Subrahmanyan, Ravi
Sutherland, R.S.
Wagner, S.J.
Keywords: gamma-ray sources
gamma-ray bursts
Jets and bursts
galactic winds and fountains
Radio galaxies
Issue Date: 2005
Publisher: American Institute of Physics
Citation: HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, 2004, Vol.745, p140
Abstract: The combined synchrotron and inverse Compton emission from jets provide us with essential information on the properties of jets within 100-1000 gravitational radii from the black hole. In some jets the inferred magnetic field is below equipartition and in MKN 501 and MKN 421, recent models imply Doppler factors of approximately 50. Both of these features confront jet-launching models with substantial challenges. In MKN 421 and MKN 501 the jets must decelerate before they reach the parsec scale and this is in fact physically consistent with conservation of energy and momentum in this region. The correlation between the peak Lorentz factor and the inverse of the magnetic plus photon energy density is most directly explained if the shocks in blazar jets are produced by intrinsic jet instabilities rather than variations in the output of the black hole. Recent analysis of a restarting radio jet galaxy provide additional evidence for hyper-relativistic jets.
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Copyright: 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Appears in Collections:Research Papers (A&A)

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