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95807 |
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|a Hardcastle, M. J.
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Marshall, Herman Lee
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|a Evans, Daniel A.
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|a Birkinshaw, M.
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|a Croston, J. H.
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|a Evans, Daniel A.
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|a Landt, H.
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|a Lenc, Emil
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|a Massaro, F.
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|a Perlman, E. S.
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|a Schwartz, D. A
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|a Siemiginowska, A.
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|a Stawarz, L.
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|a Urry, C. M.
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|a Worrall, D. M.
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|a Marshall, Herman
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|a A FLARE IN THE JET OF PICTOR A
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|b Institute of Physics/American Astronomical Society,
|c 2015-03-04T18:21:22Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/95807
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|a A Chandra X-ray imaging observation of the jet in Pictor A showed a feature that appears to be a flare that faded between 2000 and 2002. The feature was not detected in a follow-up observation in 2009. The jet itself is over 150?kpc long and about 1 kpc wide, so finding year-long variability is surprising. Assuming a synchrotron origin of the observed high-energy photons and a minimum energy condition for the outflow, the synchrotron loss time of the X-ray emitting electrons is of order 1200 years, which is much longer than the observed variability timescale. This leads to the possibility that the variable X-ray emission arises from a very small sub-volume of the jet, characterized by a magnetic field that is substantially larger than the average over the jet.
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|a Poland. Ministry of Science and Higher Education (grant N-N203-380336)
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|a Smithsonian Astrophysical Observatory (SAO contract NAS 8-39073)
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|a Chandra X-ray Center (U.S.) (contract NAS8-03060)
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|a Smithsonian Astrophysical Observatory (SAO contract SV3-73016)
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|a en_US
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|a Article
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|t Astrophysical Journal
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