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11.
Multiwavelength variability data, combined with spectral-timing analysis techniques, provides information about the causal relationship between different physical components in accreting black holes. Using fast-timing data and long-term monitoring, we can probe the behaviour of the same components across the black hole mass scale. In this chapter we review the observational status of multiwavelength variability in accreting black holes, from black hole X-ray binaries to AGN, and consider the implications for models of accretion and ejection, primarily considering the evidence for accretion disc and jet variability in these systems. We end with a consideration of future prospects in this quickly-developing field. 相似文献
12.
ISAR imaging using an emulated multistatic radar system 总被引:6,自引:0,他引:6
Palmer J. H omer J. Longstaff I.D. Martorella M. Littleton B. 《IEEE transactions on aerospace and electronic systems》2005,41(4):1464-1472
The use of a monostatic radar configuration limits the ability of an inverse synthetic aperture radar (ISAR) system to image targets in certain geometries. By employing multistatic geometries this limitation may be overcome. This paper discusses the emulation of multistatic geometries, via sea surface multipath reflections, using a monostatic system. This application capitalises on the advantages provided by both monostatic and bistatic systems. The possibility of obtaining ISAR images using these emulated multistatic radar configurations is first theoretically discussed and then verified using experimental results. 相似文献
13.
NASA's planned Ares V cargo launch vehicle offers the potential to completely change the paradigm of future space science mission architectures. Future space science telescopes desire increasingly larger telescope collecting aperture. But, current launch vehicle mass and volume constraints are a severe limit. The Ares V greatly relaxes these constraints. For example, while current launch vehicles have the ability to place a 4.5 m diameter payload with a mass of 9400 kg on to a Sun-Earth L2 transfer trajectory, the Ares V is projected to have the ability to place an 8.8 m diameter payload with a mass of approximately 60,000 kg on to the same trajectory, or 180,000 kg into Low Earth Orbit. Also the Ares V could place approximately 3000 kg (13,000 kg with a Centaur upper stage) on to a trajectory with a C3 of 106 km2/s2, arriving at Saturn in 6.1 years without the use of gravity assists. This paper summarizes the current planned Ares V payload launch capability. 相似文献
14.
Szegö Károly Glassmeier Karl-Heinz Bingham Robert Bogdanov Alexander Fischer Christian Haerendel Gerhard Brinca Armando Cravens Tom Dubinin Eduard Sauer Konrad Fisk Len Gombosi Tamas Schwadron Nathan Isenberg Phil Lee Martin Mazelle Christian Möbius Eberhard Motschmann Uwe Shapiro Vitali D. Tsurutani Bruce Zank Gary 《Space Science Reviews》2000,94(3-4):429-671
15.
T. Sakamoto L. Barbier S.D. Barthelmy J.R. Cummings E.E. Fenimore N. Gehrels H.A. Krimm C.B. Markwardt D.M. Palmer A.M. Parsons G. Sato M. Stamatikos J. Tueller 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
We present results from Swift, XMM-Newton, and deep INTEGRAL monitoring in the region of GRB 050925. This short Swift burst is a candidate for a newly discovered soft gamma-ray repeater (SGR) with the following observational burst properties: (1) galactic plane (b = −0.1°) localization, (2) 150 ms duration, and (3) a blackbody rather than a simple power-law spectral shape (with a significance level of 97%). We found two possible X-ray counterparts of GRB 050925 by comparing the X-ray images from Swift XRT and XMM-Newton. Both X-ray sources show the transient behavior with a power-law decay index shallower than −1. We found no hard X-ray emission nor any additional burst from the location of GRB 050925 in ∼5 ms of INTEGRAL data. We discuss about the three BATSE short bursts which might be associated with GRB 050925, based on their location and the duration. Assuming GRB 050925 is associated with the HII regions (W 58) at the galactic longitude of l = 70°, we also discuss the source frame properties of GRB 050925. 相似文献