Seeing and believing
Article Abstract:
The phenomenon of black holes has received strong support from the discover of a X-ray emission line matching the shape of emissions from such a structure. The line provides the best evidence for the enormous velocity, almost at the speed of light, and other manifestations of the strong gravitational field that controls the appearance of the disk. The factor, that the gravitation field bends the rays of light, gives the observer the different shades of brightness of the disk.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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The ups and downs of X-rays
Article Abstract:
Quasiperiodic changes in X-ray emission has been detected for the first time from a Seyfert or active galaxy, NGC5548. I.E. Papadakis and A. Lawrence confirmed the galaxy's quasiperiodic oscillations through analysis of data from the EXOSAT satellite. This discovery may improve comprehension of active galactic nuclei. However, why NGC5548 is quasiperiodic while other Seyfert galaxies such as NGC6814 are absolutely periodic remains an unanswered question.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Transient pulsed radio emission from a magnetar
Article Abstract:
XTE J1810-197, the first AXP, the first anomalous X-ray pulsar (AXP) with transient emission is investigated, with the aim of opening up a new window into the coronae of magnetars. It is shown that XTE J1810-197 emits bright, narrow, highly linearly polarized radio pulses, observed at every rotation, thereby establishing that magnetars can be radio pulsars.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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