Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..568b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 2, p. 568-585.
Astronomy and Astrophysics
Astronomy
75
Astronomical Spectroscopy, Galactic Nuclei, Radio Jets (Astronomy), X Ray Sources, Emission Spectra, Galactic Radiation, Proportional Counters
Scientific paper
Observations of NGC 6251 in the low-energy X-rays with the Position Sensitive Proportional Counter on board ROSAT are reported. No X-ray emission is seen from the 4.5-arcmin-long radio jet of this galaxy, suggesting that the electron spectrum is cut off for electron energies greater than 10 exp 12 eV, but a bright X-ray source is coincident with the center of the galaxy. The power-law spectral indexes is close to the HF radio spectral index of the VLBI core, supporting a synchro-self-Compton model for this component of the X-ray emission. The infall of material into the nucleus is sufficiently rapid to power the mini-AGN component, if the mass of the central black hole exceeds 50,000 solar masses.
Birkinshaw Mark
Worrall Diana Mary
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