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Your search keyword '"X-ray astronomy -- Observations"' showing total 17 results
Start Over Descriptor "X-ray astronomy -- Observations" Topic zoology and wildlife conservation
17 results on '"X-ray astronomy -- Observations"'

1. Super X-ray vision: Chandra, NASA's orbiting x-ray observatory spies a violent, roiling universe

Author

Klesius, Michael

Subjects
United States. National Aeronautics and Space Administration -- Discovery and exploration, United States. National Aeronautics and Space Administration -- Research, Chandra X-ray Observatory (Artificial satellite) -- Observations, Chandra X-ray Observatory (Artificial satellite) -- Discovery and exploration, Pulsars -- Observations, X-ray astronomy -- Observations, X-ray astronomy -- Research, X-ray astronomy -- Discovery and exploration, Anthropology/archeology/folklore, Environmental issues, General interest, Geography, History, Zoology and wildlife conservation
Abstract

THE CENTER OF THE MILKY WAY GALAXY blazes in this x-ray mosaic 900 light-years across. Our galactic center is a turbulent region, 25,000 light-years from Earth, packed with black holes, [...]

Published
2002

2. A rapid energetic X-ray flare in the quasar PKS0558-504

Author

Remillard, R.A., Grossan, B., Bradt, H.V., Ohashi, T., Hayashida, K., Makino, F., and Tanaka, Y.

Subjects
Ginga (Artificial satellite) -- Observations, X-ray astronomy -- Observations, Quasars -- Spectra, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1991

3. Discovery of an X-ray afterglow associated with the gamma-ray burst of 28 February 1997

Author

Costa, E., Frontera, F., Heise, J., Feroci, M., in 't Zand, J., Fiore, F., Cinti, M.N., Dal Fiume, D., Nicastro, L., Orlandini, M., Palazzi, E., Rapisarda, M., Zavattini, G., Jager, R., Parmar, A., Owens, A., Molendi, S., Cusumano, G., Maccarone, M.C., Giarrusso, S., Coletta, A., Antonelli, L.A., Giommi, P., Muller, J.M., Piro, L., and Butler, R.C.

Subjects
Gamma ray astronomy -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

An X-ray afterglow was discovered by the Beppo-SAX satellite following the gamma-ray burst on Feb 28 1997. A substantial proportion of the gamma-ray burst's total energy was contained in the X-ray transient. A multi-wavelength observational campaign was inititated by the quick detection of the gamma-ray burst that led to the discovery of a fading optical transient. The Beppo-SAX measurement explains the link between the location capability of radio, optical and X-ray astronomy and the gamma-ray phenomenology.

Published
1997

4. Discovery of hard X-ray pulsations from the transient source GRO J1744 - 28

Author

Finger, Mark H., Koh, Danny T., Nelson, Robert W., Prince, Thomas A., Vaughan, Brian A., and Wilson, Robert B.

Subjects
X-ray astronomy -- Observations, Radiation sources -- Observations, Neutron stars -- Discovery and exploration, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

An astronomical source GRO J1744 - 28 is a source of coherent, hard X-ray bursts which have a period of 467 milliseconds. The object is most likely a magnetized neutron star which is gathering gas from a low-mass companion star. Observations show that the pulsation rate is increasing and this indicates the formation of an accretion disk. The neutron star is spinning faster due to transfer of matter from the disk to the star.

Published
1996

5. Evidence for a black hole in the X-ray nova Muscae 1991

Author

Della Valle, M., Jarvis, B.J., and West, R.M.

Subjects
Black holes (Astronomy) -- Research, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1991

6. The distribution of iron in the Perseus cluster

Author

Ponman, T.J., Bertram, D., Church, M.J., Eyles, C.J., Watt, M.P., Skinner, G.K., and Willmore, A.P.

Subjects
Iron -- Spectra, Galaxies -- Clusters, X-ray astronomy -- Observations, Cosmic abundances -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1990

7. The theory of gamma-ray emergence in supernova 1987A

Author

Pinto, Philip A. and Woosley, S.E.

Subjects
Gamma ray astronomy -- Observations, X-ray astronomy -- Observations, Supernovae -- Spectra, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

8. Making a compelling case

Author

Bailyn, Charles D.

Subjects
Stars, Double -- Observations, Black holes (Astronomy) -- Research, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1990

9. X-ray reflection from cold matter in the nuclei of active galaxies

Author

Pounds, K.A., Nandra, K., Stewart, G.C., George, I.M., and Fabian, A.C.

Subjects
EXOSAT (Artificial satellite) -- Observations, Ginga (Artificial satellite) -- Observations, X-ray astronomy -- Observations, Active galaxies -- Observations, Dark matter (Astronomy) -- Observations, Galactic nuclei -- Observations, Seyfert galaxies -- Observations, Galaxies -- Spectra, X-ray spectroscopy -- Usage, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1990

10. Low-energy galactic-centre gamma rays from low-mass X-ray binaries

Author

Kluzniak, W., Ruderman, M., Shaham, J., and Tavani, M.

Subjects
Galactic center -- Observations, Gamma ray astronomy -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

12. Spin-down of the X-ray pulsar GX1+4 during an extended low state

Author

Makishima, K., Ohashi, T., Sakao, T., Dotani, T., Inoue, H., Koyama, K., Makino, F., Mitsuda, K., Nagase, F., Thomas, H.D., Turner, M.J.L., Kii, T., and Tawara, Y.

Subjects
Neutron stars -- Observations, X-ray astronomy -- Observations, Pulsars -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

13. Is N44C a fossil X-ray ionized nebula?

Author

Pakull, Manfred W. and Motch, Christian

Subjects
Nebulae -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1989

14. X-ray emission from the ring nebula NGC6888

Author

Bochkarev, N.G.

Subjects
X-ray astronomy -- Observations, Nebulae -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

15. Gamma-rays and X-rays from SN1987A

Author

Leising, Mark D.

Subjects
Gamma ray astronomy -- Observations, Supernovae -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

16. The shifting centre

Author

Trimble, Virginia

Subjects
Infrared astronomy -- Observations, Neutrino astrophysics -- Research, Radio sources (Astronomy) -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

17. Structure of a ring nebula

Author

Raymond, J.C.

Subjects
Nebulae -- Observations, X-ray astronomy -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Published
1988

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