Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Skinner, Gerald K."'
Autor:
Zdziarski, Andrzej A., Maitra, Chandreyee, Frankowski, Adam, Skinner, Gerald K., Misra, Ranjeev
We study orbital modulation of X-rays from Cyg X-3, using data from Swift, INTEGRAL and RXTE. Using the wealth of the presently available data and an improved averaging method, we obtain energy-dependent folded and averaged light curves with unpreced
Externí odkaz:
http://arxiv.org/abs/1205.4402
Publikováno v:
Mon. Not. R. Astron. Soc. 416, 1324-1339 (2011)
We have studied the X-ray variability patterns and correlations of the radio and X-ray fluxes in all spectral states of Cyg X-1 using X-ray data from RXTE/ASM, CGRO/BATSE, and Swift/BAT. In the hard state, the dominant spectral variability is a chang
Externí odkaz:
http://arxiv.org/abs/1103.2988
Autor:
Wilson-Hodge, Colleen A., Cherry, Michael L., Baumgartner, Wayne H., Beklen, Elif, Bhat, P. Narayana, Briggs, Michael S., Camero-Arranz, Ascension, Case, Gary L., Chaplin, Vandiver, Connaughton, Valerie, Finger, Mark H., Gehrels, Neil, Greiner, Jochen, Jahoda, Keith, Jenke, Peter, Kippen, R. Marc, Kouveliotou, Chryssa, Krimm, Hans A., Kuulkers, Erik, Meegan, Charles A., Natalucci, Lorenzo, Paciesas, William S., Preece, Robert, Rodi, James C., Shaposhnikov, Nikolai, Skinner, Gerald K., Swartz, Doug, von Kienlin, Andreas, Diehl, Roland, Zhang, Xiao-Ling
Publikováno v:
Wilson-Hodge, C.A. et al. 2011, ApJ, 727, L40
The Crab Nebula is the only hard X-ray source in the sky that is both bright enough and steady enough to be easily used as a standard candle. As a result, it has been used as a normalization standard by most X-ray/gamma ray telescopes. Although small
Externí odkaz:
http://arxiv.org/abs/1010.2679
Publikováno v:
MNRAS, 412, 1985-1992 (2011)
We study properties of the superorbital modulation of the X-ray emission of Cyg X-1. We find that it has had a stable period of about 300 d in soft and hard X-rays and in radio since 2005 until at least 2010, which is about double the previously seen
Externí odkaz:
http://arxiv.org/abs/1009.2907
Autor:
Skinner, Gerald K.
Diffractive X-ray telescopes using zone plates, phase Fresnel lenses, or related optical elements have the potential to provide astronomers with true imaging capability with resolution several orders of magnitude better than available in any other wa
Externí odkaz:
http://arxiv.org/abs/1009.2101
Autor:
Skinner, Gerald K.
High energy (~GeV) positrons are seen within cosmic rays and observation of a narrow line at 511 keV shows that positrons are annihilating in the galaxy after slowing down to ~keV energies or less. Our state of knowledge of the origin of these positr
Externí odkaz:
http://arxiv.org/abs/1009.2098
Autor:
Krimm, Hans A., Barthelmy, Scott D., Gehrels, Neil, Tueller, Jack, Baumgartner, Wayne H., Cummings, Jay R., Sakamoto, Taka, Fenimore, Edward E., Palmer, David M., Markwardt, Craig B., Skinner, Gerald K., Stamatikos, Michael
The Swift Burst Alert Telescope (BAT) hard X-ray transient monitor tracks more than 700 galactic and extragalactic sources on time scales ranging from a single Swift pointing (approximately 20 minutes) to one day. The monitored sources include all ob
Externí odkaz:
http://arxiv.org/abs/0912.3498
Autor:
Skinner, Gerald K.
Simple formulae are often used to estimate the sensitivity of coded mask X-ray or gamma-ray telescopes, but these are strictly only applicable if a number of basic assumptions are met. Complications arise, for example, if a grid structure is used to
Externí odkaz:
http://arxiv.org/abs/0804.1089
Autor:
Skinner, Gerald K.
Achromatic combinations of a diffractive Phase Fresnel Lens and a refractive correcting element have been proposed for X-ray and gamma-ray astronomy and for microlithography, but considerations of absorption often dictate that the refractive componen
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407457
Autor:
Skinner, Gerald K.
Publikováno v:
Scientific American, 1988 Aug 01. 259(2), 84-89.
Externí odkaz:
https://www.jstor.org/stable/24989198