Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...499..713t&link_type=abstract
Astrophysical Journal v.499, p.713
Astronomy and Astrophysics
Astronomy
70
Radiation Mechanisms: Nonthermal, Galaxies: Individual Name: Centaurus B, Radio Continuum: Galaxies, X-Rays: Galaxies
Scientific paper
We observed the radio galaxy PKS 1343-601 (Centaurus B) in X-rays with ASCA and discovered diffuse hard X-ray emission from its radio lobe region. The obtained flux and spectrum strongly suggest that the X-rays are produced via an inverse-Compton (IC) process, in which the cosmic microwave background photons are boosted up to X-rays by synchrotron electrons. This is the second case, following the case of Fornax A, of the detection of the IC X-rays from radio lobes. The observed X-ray emission is brighter than expected in the case of minimum energy density, indicating particle-dominated lobes. Comparison of the X-ray and radio images reveals an outward increase in the magnetic energy density. This infers a gradual compression of magnetic fields toward the edge of the lobes.
Idesawa Eriko
Ishisaki Yoshitaka
Iyomoto Naoko
Kaneda Hidehiro
Kotani Takao
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