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Your search keyword '"De Paolis, F"' showing total 17 results
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17 results on '"De Paolis, F"'

12. OBSERVING BLACK HOLES.

Author

DE PAOLIS, F., INGROSSO, G., NUCITA, A. A., and QADIR, A.

Subjects
BLACK holes, GRAVITATIONAL fields, GENERAL relativity (Physics), ASTRONOMY, MATHEMATICAL physics
Published
2005

13. A GAMMA RAY HALO AROUND THE MILKY WAY.

Author

De Paolis, F., INGROSSO, G., JETZER, PH., and RONCADELLI, M.

Subjects
GAMMA rays, MILKY Way, GALAXIES, STAR clusters, DARK matter
Published
2000

14. Retro gravitational lensing for Sgr A* with Radiastron.

Author

Zakharov, A. F., Nucita, A. A., De Paolis, F., and Ingrosso, G.

Subjects
STARS, SUPERMASSIVE black holes, KERR black holes, MIRAGES, GRAVITATIONAL fields, RADIO telescopes
Abstract

Recently Holz & Wheeler (2002) have considered a very attractive possibility to detect retro-MACHOs, i.e. retro-images of the Sun by a Schwarzschild black hole. We analyze the case of a Kerr black hole with an arbitrary spin for some selected positions of a distant observer with respect to the equatorial plane of a Kerr black hole. We discuss glories (mirages) formed near rapidly rotating Kerr black hole horizons and propose a procedure to measure masses and rotation parameters by analyzing these forms of mirages. In some sense, that is a manifestation of gravitational lens effect in the strong gravitational field near the black hole horizon and a generalization of the retro-gravitational lens phenomenon. We also propose to use future radio interferometer Radioastron facilities to measure shapes of mirages (glories) and to evaluate the black hole spin as a function of the position angle of a distant observer. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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15. HIGH-ENERGY GAMMA-RAY FROM GRBs.

Author

ORLANDO, D., DE PAOLIS, F., and INGROSSO, G.

Subjects
GAMMA ray bursts, COSMIC rays, MAGNETIC fields, GAMMA ray astronomy, ASTROPHYSICS, ELECTROMAGNETIC waves
Published
2002

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