Emission from Large-scale Jets in Quasars

Details Emission from Large-scale Jets in Quasars Emission from Large-scale Jets in Quasars

2008-09-15

arxiv.org/abs/0809.2620v1

Int.J.Mod.Phys.D17:1475-1481,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, to appear in a special issue of the International Journal of Modern Physics D, proceedings of "High Energy

Scientific paper

10.1142/S0218271808013054

We consider the emission processes in the large-scale jets of powerful quasars based on the results obtained with the VLA, Spitzer, Hubble, and Chandra. We show that two well-known jets, 3C 273 and PKS 1136-135, have two distinct spectral components on large-scales: (1) the low-energy (LE) synchrotron spectrum extending from radio to infrared, and (2) the high-energy (HE) component arising from optical and extending to X-rays. The X-ray emission in quasar jets is often attributed to inverse-Compton scattering of cosmic microwave background (CMB) photons by radio-emitting electrons in a highly relativistic jet. However, recent data prefer synchrotron radiation by a second distinct population as the origin of the HE component. We anticipate that optical polarimetry with Hubble will establish the synchrotron nature of the HE component. Gamma-ray observations with GLAST (renamed as the Fermi Gamma-ray Space Telescope), as well as future TeV observations, are expected to place important constraints on the jet models.

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