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arXiv · 0708.1312

The Case of the 300 kpc Long X-ray Jet in PKS 1127-145 at z=1.18

Aneta Siemiginowska·D. E. Harris·Thomas L. Aldcroft·Lukasz Stawarz·C. C. Cheung·Marek Sikora·Jill Bechtold
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Abstract

The complex X-ray morphology of the 300 kpc long X-ray jet in PKS1127-145 (z=1.18 quasar) is clearly discerned in a ~100 ksec Chandra observation. The jet X-ray surface brightness gradually decreases by an order of magnitude going out from the core. The X-ray spectrum of the inner jet is relatively flat with alpha_X=0.66+/-0.15 and steep in the outer jet with alpha_X=1.0+/-0.2. The X-ray and radio jet intensity profiles are strikingly different, with the radio emission peaking strongly at the two outer knots while the X-ray emission is strongest in the inner jet region. We discuss the constraints implied by these data on the X-ray emission models and conclude that ``one-zone'' models fail and that at least a two-component model is needed to explain the jet's broadband emission. We propose that the X-ray emission originates in the jet proper while the bulk of the radio emission comes from a surrounding jet sheath. We also consider intermittent jet activity as a possible cause of the observed jet morphology.

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Aneta Siemiginowska, D. E. Harris, Thomas L. Aldcroft, Lukasz Stawarz, C. C. Cheung, Marek Sikora, Jill Bechtold. 2007-08-09. The Case of the 300 kpc Long X-ray Jet in PKS 1127-145 at z=1.18. https://arxiv.org/abs/0708.1312

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