A split-personality x-ray beacon tantalizes theorists

Article Abstract:

X-ray astronomers have detected the first known x-ray source that emits both standard oscillating pulses and erratic flashes. The combined behavior may be the result of a new type of interaction between material falling into a neutron star and the star's magnetic field.

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Visions of black holes; a menagerie of black holes - forming, colliding, evaporating - is romping through the minds and computers of theorists, testing their command of Einstein's theory and hinting at new physics

Article Abstract:

New theories of black black hole behavior are proliferating even though the existence of black holes has not been definately established. Theorists are motivated to understand the possible implications of Einstein's general theory of relativity.

Brief Article, Black holes (Astronomy), General relativity (Physics)

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Photon bubbles put X-ray fizz into neutron stars

Article Abstract:

Data from the Rossi X-Ray Timing Explorer suggest a new theory of the oscillations in star-size X-ray sources. In the new model, streams of matter collapsing into neutron stars contain vibrating 'bubbles' of X-ray photons.

Rossi X-Ray Timing Explorer (Artificial satellite)

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