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Temporal Studies Of Compact Galactic X Ray Sources
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Book Synopsis Temporal Studies of Compact Galactic X-ray Sources by : Edward Harrington Morgan
Download or read book Temporal Studies of Compact Galactic X-ray Sources written by Edward Harrington Morgan and published by . This book was released on 1987 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compact Galactic X-ray Sources by : Frederick Lamb
Download or read book Compact Galactic X-ray Sources written by Frederick Lamb and published by . This book was released on 1979 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compact Stellar X-ray Sources by : Walter Lewin
Download or read book Compact Stellar X-ray Sources written by Walter Lewin and published by Cambridge University Press. This book was released on 2006-04-06 with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray astronomy is the prime available window on astrophysical compact objects: black holes, neutron stars and white dwarfs. In this book, prominent experts provide a comprehensive overview of the observations and astrophysics of these objects. This is a valuable reference for graduate students and active researchers.
Book Synopsis Spectroscopy of Compact Extragalactic X-ray Sources by : Stephen S. Holt
Download or read book Spectroscopy of Compact Extragalactic X-ray Sources written by Stephen S. Holt and published by . This book was released on 1980 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soft X-ray Spectral and Temporal Properties of Galactic Sources by : Steven Michael Kahn
Download or read book Soft X-ray Spectral and Temporal Properties of Galactic Sources written by Steven Michael Kahn and published by . This book was released on 1980 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Evolution of Galactic X-Ray Binaries by : J. Truemper
Download or read book The Evolution of Galactic X-Ray Binaries written by J. Truemper and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: The idea to hold a conference on the Evolution of Close-Binary X-ray sources grew in the summer of 1984. At that time we were hoping that some new results would be harvested in the months to come which would stimulate further work. We were particularly looking towards the Euro pean X-ray Observatory, EXOSAT, for new contributions. How lucky we were; quite unexpected developments took place. Just prior to the conference, quasi-periodic oscillations (now known as QPO) were discovered in three bright low-mass X-ray binaries: GX 5-1, Sco X-1, and Cyg X-2. They played an important role at the meeting. The possibility that QPOs imply a neutron star magnetic dipole field, and a neutron star rotation period in the millisecond range, received a lot of attention. This is not surprising, as it lends support to the idea, suggested earlier, that the 6-msec binary radio pulsar PSR 1953+29 evolved from a stage in which it was a bright low-mass X-ray binary. There was special interest in the possibility of white dwarf collapse into a neutron star. This is a. particularly attractive way to form the bright low-mass X-ray binaries, often referred to as galactic bulge sources. It would allow for the possibility of a very young neutron star in a very old binary system. The relatively high magnetic fields that one could infer from QPO could then be explained.
Book Synopsis Apollo Galactic X-ray Astronomy Observations by : I. Adler
Download or read book Apollo Galactic X-ray Astronomy Observations written by I. Adler and published by . This book was released on 1971 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bright Galactic X-ray Binary Sources by : Saeqa Dil Vrtilek
Download or read book Bright Galactic X-ray Binary Sources written by Saeqa Dil Vrtilek and published by . This book was released on 1985 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis X- and Gamma-Ray Astronomy by : H. Bradt
Download or read book X- and Gamma-Ray Astronomy written by H. Bradt and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: The IAU Symposium No. 55 on 'X-Ray and Gamma-Ray Astronomy' has occurred, not entirely by coincidence, at an important moment in the development of these new branches of observational astronomy. In X-ray astronomy the data from the first X-ray observatory UHURU have contributed to a new view of the X-ray sky and a new conception of the nature and properties of galactic and extragalactic X-ray sources. In gamma-ray astronomy the exciting and often controversial nature of the results underlines the importance of the forthcoming launch of SAS-B, the first orbiting y-ray observatory. As Bruno Rossi reminds us (p. I), the Symposium occurred almost exactly ten years after the first detection of the X-ray star Sco X-I. During this time we have moved from the detection of a handful of the nearest and brightest sources to the detailed study of the nature of stellar sources in the farthest reaches of our own galaxy and in external galaxies of the local group. The detection of pulsating X-ray sources in bi nary systems permits the measurement of pulsation periods, and orbital parameters with precisions comparable to any yet achieved with traditional observational techniques. The strong indications that most X-ray sources are extremely compact objects give us confidence that X-ray astronomy will playa significant and possibly decisive role in the study of stars near the end point of stellar evolution.
Book Synopsis Very Old and Very Young Compact Objects by : David Aaron Pooley
Download or read book Very Old and Very Young Compact Objects written by David Aaron Pooley and published by . This book was released on 2003 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis comprises the results of two distinct areas of research, namely, X-ray studies of Galactic globular clusters and X-ray studies of recent core collapse supernovae. My analyses of the Chandra X-ray Observatory observations of the globular clusters NGC 6752 and NGC 6440 revealed as many low-luminosity X-ray sources as was in the entire census of globular cluster sources with the previous best X-ray imaging instrument, Rontgensatellit. In the observation of NGC 6752, I detect 6 X-ray sources within the 10':5 core radius and 13 more within the 115" half-mass radius down to a limiting luminosity of Lx = 1030 ergs s-l for cluster sources. Based on a reanalysis of archival data from the Hubble Space Telescope and the Australia Telescope Compact Array, I make 12 optical identifications and one radio identification. Based on X-ray and optical properties of the identifications, I find 10 likely cataclysmic variables (CVs), 1-3 likely RS CVn or BY Dra systems, and 1 or 2 possible background objects. Of the 7 sources for which no optical identifications were made, one was detected in the archival radio data, and another was found to be a millisecond pulsar. Of the remaining sources, I expect that 2-4 are background objects and that the rest are either CVs or millisecond pulsars whose radio emission has not been detected. These and other Chandra results on globular clusters indicate that the dozens of CVs per cluster expected by theoretical arguments are being found. The findings to date also suggest that the ratio of CVs to other types of X-ray sources is remarkably similar in clusters of very different structural parameters.
Download or read book X-Ray Timing Explorer (XTE). written by and published by . This book was released on 1980 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cataclysmic Variables and Low-Mass X-Ray Binaries by : D.Q. Lamb
Download or read book Cataclysmic Variables and Low-Mass X-Ray Binaries written by D.Q. Lamb and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1976 a meeting devoted to recent research on cataclysmic variables ("CV workshop") has been held annually somewhere in North America. Many of the meetings have been held - following a custom older than anyone reading this book - in locations with well-known recreational potential (e. g. Santa Cruz, CA; Boulder, CO). We thought hard about this custom while contemplating the possibility of organi zing a meeting in Massachusetts in the middle of winter. Nobody wants their meeting to go down in history as the smallest and dullest, and it ~ surely be the coldest. But on occasion, meeting organizers have defied custom and scheduled meetings for less~than-trendy places, and gotten away with it (Ur·bana, IL and Rochester, NY must be reckoned as examples of this). Encouraged by the spatial and temporal proximity of the American Astronomical Society meeting (Boston, January 9-12), we thought we might get away with it again, and so came to organize a meeting for January 12-15, 1983, in Cambridge, MA. There was another reason for a meeting at this time and place, we loftily proclaimed in early mailings. No one doubts that the CV's are closely related to the low-mass X-ray binaries ("LMXB' s"), in which the accreting star is usually, or perhaps always, more compact than a white dwarf. Many of the general characteristics of LMXB's sound pretty familiar to any student of CV's: orbital periods in the range 0.
Book Synopsis Some Observational Aspects of Compact Galactic X-ray Sources by : Johan Heise
Download or read book Some Observational Aspects of Compact Galactic X-ray Sources written by Johan Heise and published by . This book was released on 1982 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectra and Timing of Compact X-ray Binaries by : Pranab Ghosh
Download or read book Spectra and Timing of Compact X-ray Binaries written by Pranab Ghosh and published by . This book was released on 2006 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Formation of the Power Density Spectrum in the Accreting Compact X-ray Objects by : Andrey Makeev
Download or read book Formation of the Power Density Spectrum in the Accreting Compact X-ray Objects written by Andrey Makeev and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the remarkable phenomena, characterizing both Galactic and extra-Galactic Xray binary systems, is the substantial variability of a photon ux, detectable in a very broad range of timescales. For instance, the accretion ow near a black hole event horizon can produce X-ray variability on a millisecond timescale. At the same time aperiodic changes from the extended accretion disk formed around the same black hole can occur on timescales of order of several months to years. A complex structure, involving high and low frequency nearly periodic oscillations and aperiodic features, observed in X-ray lightcurves, is the subject of intensive studies. The characteristic quantities, extracted from temporal analysis, carry speci c physical meaning and contain direct observational information about dynamics of the accreting X-ray source. It is the established fact that X-ray spectral and timing properties are tightly correlated. Combined together, the photon energy spectrum and the power density spectrum analyses, form a powerful framework that brings up the complete (in the energy/space domain) picture of the physical processes at work in the accreting system. Simultaneous study of spectral and timing characteristics allows for comprehensive probing of the geometry of accretion ows, reliable identification of the type of an X-ray source (black hole vs neutron star), constraining mass, size, and spin of accreting stellar-mass compact objects. Up until now there is no self-consistent physical model of the formation and evolution of the X-ray variability. This leaves a relative freedom in interpretation of the characteristic quantities obtained from the timing analysis. The current work aims at development of the physical alternative to the commonplace ad hoc description of the Fourier power density spectrum of X-ray timing signal. In the following study we employ the diffusion theory to directly solve for the X-ray luminosity fluctuations. The basic underlying physical assumption is that the observed variability of X-ray luminosity originates as the result of local fluctuations of the accretion rate, at all radii in the disk, that diffusively propagate outward. Energy dissipation (and X-ray emission) occurs in a narrow, shock-like region, called the transition layer, where the Keplerian ow becomes non-Keplerian in order to adjust itself to the slowly-rotating surface of a neutron star or the innermost stable orbit around a black hole. The X-ray time signal from the transition region, as seen by a remote observer, is obtained by integrating over the emission zone. The signal's power spectrum is then calculated and analyzed. Our diffusion model of the power spectrum formation operates with parameters that are physical characteristics of the accretion ow: the diffusion time scale, the Reynolds number (which is connected to the viscosity -parameter), Keplerian and magnetosonic quasi-periodic oscillation frequencies, radial size of the transition layer, and viscosity index, related to the viscosity distribution law in the system. These quantities constitute the core of temporal data used along with the spectral information to study physics of accretion. The proposed propagating fluctuation model can reproduce fundamental properties of the variability observed in X-ray light curves of accreting black hole and neutron star systems, as well as explain the power spectrum evolution during the spectral state transitions of the source.
Book Synopsis Galactic X-ray Sources by : Peter W. Sanford
Download or read book Galactic X-ray Sources written by Peter W. Sanford and published by John Wiley & Sons. This book was released on 1982 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Resolution X-ray Spectroscopy of Cosmic Plasmas by : International Astronomical Union. Colloquium
Download or read book High Resolution X-ray Spectroscopy of Cosmic Plasmas written by International Astronomical Union. Colloquium and published by Cambridge University Press. This book was released on 1990-04-26 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives an account of the proceedings of the International Astronomical Union Colloquium 115: High Resolution X-Ray Spectroscopy of Cosmic Plasmas. This was the first IAU meeting dedicated to high resolution X-ray spectroscopy of objects outside the solar system. A broad range of objects and astrophysical conditions are discussed. Results from the first generation of satellites with spectroscopic capability, i.e. the Einstein Observatory, EXOSAT, and Tenma, are reviewed from a perspective of a more precise interpretation allowed by improved theoretical models and plasma diagnostics. Laboratory and solar X-ray results that model or are relevant to conditions found in cosmic X-ray sources are also presented. The colloquium presents a forum for discussion of scientific objectives of new international missions in high resolution X-ray spectroscopy.