Two sources of diffuse X-ray emission from the Galactic Centre
Article Abstract:
The scattering of incident X-rays in the dense massive clouds of molecular gas originating from the region of Galactic Center may have been caused by the diffuse emission above 10 KeV. The changing spatial distribution and the presence of a pronounced absorption feature in the emission spectrum in the energy range 8-11 KeV shows that the scattering of X-rays from the neighboring compact sources by the dense molecular clouds causes the high energy emissions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Reconciling the magnetic field structures seen in variable active galactic nuclei with the unified scheme
Article Abstract:
Differences in the orientation of BL Lacertae (BL Lacs) and highly polarized quasar (HPQ) jets are explained within the context of the unified scheme. For BL Lacs, the observed knot emission comes mainly from the newly excited plasma of the shock front. On the other hand, the Doppler boosted emissions observed in HPQs arise from post-shock plasma. These observations are a result of relativistic aberration.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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X-ray flares from runaway pair production in active galactic nuclei
Article Abstract:
X-ray flares emitted in the nuclei of galaxies could be caused by the runaway production of proton-photon pairs, which then produce synchrotron radiation. Protons moving at relativistic speeds interact with the local radiation field to create relativistic electrons. Because the rate of X-ray production increases with X-ray density, a cascade effect produces the bursts.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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