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6 results on '"Grindlay, Jonathan"'

1. Extended hard-X-ray emission in the inner few parsecs of the Galaxy

Author

Perez, Kerstin, Hailey, Charles J., Bauer, Franz E., Krivonos, Roman A., Mori, Kaya, Baganoff, Frederick K., Barrière, Nicolas M., Boggs, Steven E., Christensen, Finn E., Craig, William W., Grefenstette, Brian W., Grindlay, Jonathan E., Harrison, Fiona A., Hong, Jaesub, Madsen, Kristin K., Nynka, Melania, Stern, Daniel, Tomsick, John A., Wik, Daniel R., Zhang, Shuo, Zhang, William W., and Zoglauer, Andreas

Published
2015
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3. Light on the distant universe: observations of a long-lasting γ-ray burst, one that has the brightest optical counterpart yet discovered, challenge theoretical understanding of these bursts but may enhance their usefulness as cosmic probes

Author

Grindlay, Jonathan

Subjects
Gamma rays -- Optical properties, Environmental issues, Science and technology, Zoology and wildlife conservation, Optical properties
Abstract

On a clear night, from one of Earth's increasingly rare dark sites, one can see roughly 3,000 stars with the naked eye. All of these point sources of light are [...]

Published
2008

4. Black holes take centre stage?

Author

Grindlay, Jonathan E.

Subjects
Galactic center -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Use of the Sigma/GRANAT telescope in a hard X-ray imaging survey of the Galactic Centre reveals luminous hard X-ray sources around the center but does not indicate the presence of a black hole in the center. The hole, if present, may remain dormant. Absence of hard X-ray emission in the supposed Galactic Centre of Sagittarius A* raises questions about the absence of accretion on the central black hole from the gas clouds.

Published
1994

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