The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?
The luminous X-ray hotspot in 4C 74.26: synchrotron or inverse-Compton emission?
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4C 74.26 中的发光 X 射线热点:同步加速器还是逆康普顿发射?
DOI:
10.1111/j.1365-2966.2007.11962.x
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发表时间:
2007
影响因子:
4.8
通讯作者:
Erlund M
中科院分区:
文献类型:
--
作者:
Erlund M
We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C 74.26 (whose redshift isz= 0.104). BothXMM–NewtonandChandraimages reveal the same significant (10 arcsec i.e. 19 kpc) offset between the X-ray hotspot and the radio hotspot imaged with MERLIN. The peak of the X-ray emission may be either due to synchrotron emission or due to inverse-Compton emission. If synchrotron emission, the hotspot represents the site of particle acceleration and the offset arises from either the jet exhibiting Scheuer's ‘dentist's drill’ effect or a fast spine having less momentum than the sheath surrounding it, which creates the radio hotspot. If the emission arises from the inverse-Compton process, it must be inverse-Compton scattering of the cosmic microwave background in a decelerating relativistic flow, implying that the jet is relativistic (Γ≥ 2) out to a distance of at least 800 kpc. Our analysis, including optical data from the Liverpool Telescope, rules out a background active galactic nucleus for the X-ray emission and confirms its nature as a hotspot, making it the most-X-ray-luminous hotspot detected at low redshift.
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