Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0709m&link_type=abstract
American Astronomical Society, HEAD meeting #11, #7.09; Bulletin of the American Astronomical Society, Vol. 41, p.661
Astronomy and Astrophysics
Astronomy
Scientific paper
Pictor A is a nearby, powerful radio galaxy of the Fanaroff-Riley type II class. The X-ray emitting jet is unusually narrow and well collimated with an opening angle of about one degree over much of its 100 kpc length. The bright lobes and large physical extent indicate that the jet is not closely aligned to the line of sight, so the jet X-ray emission is thought to arise from synchrotron emission rather than inverse Compton scattering of microwave background photons. The cross-jet extent is of order kpc, as found by Wilson et al. (2001). However, we find marginal evidence for variability between two observations taken less than two years apart. If confirmed in an upcoming observation, this variability would indicate that the X-ray emission is spatially concentrated into regions x1000 smaller than the width of the jet.
Hardcastle Martin
Marshall Herman L.
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