Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-26
Astrophys.J.631:L113-L116,2005
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures; accepted for publication in ApJ Letters
Scientific paper
10.1086/497426
Emission from the relativistic jet located at hundreds of kpc from the core of the superluminal quasar PKS 0637-752 was detected at 3.6 and 5.8 microns with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. The unprecedented sensitivity and arcsecond resolution of IRAC allows us to explore the mid-infrared emission from kiloparsec-scale quasar jets for the first time. The mid-infrared flux from the jet knots, when combined with radio and optical fluxes, confirms a synchrotron origin of the radio-to-optical emission and constrains very well the high energy end of the nonthermal electron distribution. Assuming the X-rays are produced in the relativistically moving knots via inverse Compton scattering of cosmic microwave background (CMB) radiation, the infrared observation puts constraints on the matter content of the quasar extended jet. Specifically, pure electron-positoron pair jet models are unfavorable based on the lack of an infrared bump associated with ``bulk Comptonization'' of CMB photons by an ultrarelativistic jet.
Cheung Charlotte
Duyne Jeff Van
Maraschi Laura
Sambruna Rita M.
Takahashi Tadayuki
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