NDLI: Chandra discovery of extended non-thermal emission in 3C 207 and the spectrum of the relativistic electrons

Content Provider	EDP Sciences
Author	G. Brunetti M. Bondi A. Comastri G. Setti
Abstract	We report on the Chandra discovery of large scale non–thermal emission features in the double lobed SSRL quasar 3C 207 (). These are: a diffuse emission well correlated with the western radio lobe, a bright one sided jet whose structure coincides with that of the eastern radio jet and an X-ray source at the tip of the jet coincident with the hot spot of the eastern lobe. The diffuse X-ray structure is best interpreted as inverse Compton (IC) scattering of the IR photons from the nuclear source and provides direct observational support to an earlier conjecture (Brunetti et al. [CITE]) that the spectrum of the relativistic electrons in the lobes of radio galaxies extends to much lower energies than those involved in the synchrotron radio emission. The X-ray luminous and spatially resolved knot along the jet is of particular interest: by combining VLA and Chandra data we show that a SSC model is ruled out, while the X-ray spectrum and flux can be accounted for by the IC scattering of the CMB photons (EIC) under the assumptions of a relatively strong boosting and of an energy distribution of the relativistic electrons as that expected from shock acceleration mechanisms. The X-ray properties of the hot spot are consistent with a SSC model. In all cases we find that the inferred magnetic field strength are lower, but close to the equipartition values. The constraints on the energy distribution of the relativistic electrons, imposed by the X-ray spectra of the observed features, are discussed. To this aim we derive in the Appendices precise semi–analytic formulae for the emissivities due to the SSC and EIC processes.
Ending Page	809
Starting Page	795
Page Count	15
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2002/03/aah3067/aah3067.html
e-ISSN	14320746
Issue Number	3
Journal	Astronomy & Astrophysics
Volume Number	381
DOI	10.1051/0004-6361:20011462
Language	English
Publisher	EDP Sciences
Publisher Date	2002-01-01
Access Restriction	Open
Rights Holder	© ESO, 2002
Subject Keyword	radiation mechanisms: non-thermal galaxies: active quasars: individual: 3C 207 galaxies: jets radio continuum: galaxies X-rays: galaxies radiation mechanisms: non-thermal / galaxies: active / quasars: individual: 3C 207 / galaxies: jets / radio continuum: galaxies / X-rays: galaxies
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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