Results 151 to 160 of about 77,058 (202)

The XEUS x-ray telescope

SPIE Proceedings, 2006
XEUS, the 'X-ray Early Universe Spectroscopy Mission', is a potential candidate for inclusion into the Cosmic Visions 1525 Science Programme of the European Space Agency ESA [1,2]. It is being studied jointly with the Japanese Aerospace Exploration Agency JAXA.
Bavdaz, M., Lumb, D., Gondoin, P., Lyngvi, A., Rando, N., Peacock, T., van der Laan, T., Wallace, K., Mieremet, A., Oemrawsingh, S., Beijersbergen, M., Collon, M., Kraft, S., Graue, R., Kampf, D., Freyberg, M.   +15 more
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Supermirror hard-x-ray telescope

Applied Optics, 1998
The practical use of a grazing x-ray telescope is demonstrated for hard-x-ray imaging as hard as 40 keV by means of a depth-graded d-spacing multilayer, a so-called supermirror. Platinum-carbon multilayers of 26 layer pairs in three blocks with a different periodic length d of 3-5 nm were designed to enhance the reflectivity in the energy range from 24
K, Yamashita, P J, Serlemitsos, J, Tueller, S D, Barthelmy, L M, Bartlett, K W, Chan, A, Furuzawa, N, Gehrels, K, Haga, H, Kunieda, P, Kurczynski, G, Lodha, N, Nakajo, N, Nakamura, Y, Namba, Y, Ogasaka, T, Okajima, D, Palmer, A, Parsons, Y, Soong, C M, Stahl, H, Takata, K, Tamura, Y, Tawara, B J, Teegarden   +24 more
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Wide field x-ray telescope mission

SPIE Proceedings, 2008
The Wide Field X-Ray Telescope (WFXT) will carry out an unprecedented X-ray survey of galaxy clusters and groups, AGNs and QSOs, and galaxies. WFXT is a medium-class strategic mission that will address key questions in both Cosmic Origins and Physics of the Cosmos.
Murray SS, Norman C, Ptak A, Giacconi R, Weisskopf M, Ramsey B, Bautz M, Vikhlinin A, Brandt N, ROSATI, Piero, Weaver H, Allen S, Flanagan K.   +12 more
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Monochromatic X-ray source for calibrating X-ray telescopes

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000
Abstract A quasi-monochromatic X-ray source for calibrating X-ray space telescopes was developed, manufactured and tested. The source consists of a powerful X-ray tube of an open type with changeable anode targets and a regulated double-crystal monochromator.
V Arkadiev, H Bräuninger, W Burkert, A Bzhaumikhov, H.-E Gorny, N Langhoff, A Oppitz, J Rabe   +7 more
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Development of x-ray mirrors for x-ray telescopes

SPIE Proceedings, 2005
We have been developing X-ray mirrors for X-ray telescope using a ion-beam sputtering system. X-rays can be reflected by two processes, one is total reflection, and another is Bragg reflection. Total reflection is used for previous telescope below 10 keV. Its reflectivity determined by the optical constant. We suggests composite-layer mirror for soft X-
Keisuke Tamura, Chiaki Sakai, Nubuaki Yamada, Yasushi Ogasaka, Ryo Shibata   +4 more
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X-ray telescopes

Reports on Progress in Physics, 1985
This review summarises the present knowledge about X-ray reflection from real mirrors, with particular emphasis on X-ray scattering. The mirror configurations for a telescope are presented and their imaging capabilities are discussed. The fabrication techniques and the supporting metrology methods used for the manufacture of highly aspherical telescope
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Hybrid X-Ray Telescope Systems

SPIE Proceedings, 1986
It has been known for some time that glancing incidence X-ray optics have sharply peaked point response functions. The spatial resolution of Wolter X-ray telescope systems is frequently limited by the performance characteristics of the X-ray detector rather than by the optics, even when high resolution detectors such as photographic emulsions are used.
David L. Shealy, Richard B. Hoover
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Toward active x-ray telescopes

SPIE Proceedings, 2011
100985
O'Dell, SL, Gubarev, MV, Kolodziejczak, JJ, Ramsey, BD, Atkins, C, Doel, P, Button, TW, Rodriguez Sanmartin D, Cotroneo, V, Davis, WN, Freeman, MD, Reid, PB, Schwartz, DA, Feldman, CH, Willingale, R, Michette, AG, Saha, TT, Zhang, WW, Trolier-Mckinstry, S, Wilke, RHT   +19 more
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Spectral Slicing X-Ray Telescope

Optical Engineering, 1986
Layered synthetic microstructure (LSM) X-ray optics is investigated as a system for coupling a conventional glancing incidence X-ray mirror to a high sensitivity X-ray detector. It is shown that, by the use of figured LSM optics, it is possible to magnify the X-ray image produced by the primary mirrors so as to maintain their high inherent spatial ...
Richard B. Hoover, David L. Shealy, Shao-Hua Chao   +2 more
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X-ray Telescopes

1996
The spectra of stars, even for early-type (hot) stars, fall off steeply in the ultraviolet. The falloff is roughly according to the Wien radiation law that prevails on the short-wavelength side of the black-body radiation peak. Nevertheless, there has been considerable interest in the ultraviolet because many spectral features pertaining to ionized ...
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