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Author : Aldo Treves
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (43 download)
Download or read book Variability of Galactic and Extragalactic X-ray Sources written by Aldo Treves and published by . This book was released on 1987 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Aldo Treves
Publisher :
ISBN 13 :
Total Pages : 279 pages
Book Rating : 4.:/5 (461 download)
Download or read book Variability of Galactic and Extragalactic X-ray Sources written by Aldo Treves and published by . This book was released on 1986 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stephen S. Holt
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.3/5 (91 download)
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:
Author : Yasuo Tanaka
Publisher :
ISBN 13 :
Total Pages : 342 pages
Book Rating : 4.:/5 (5 download)
Download or read book Japan-U.S. Seminar on Galactic and Extragalactic Compact X-ray Sources written by Yasuo Tanaka and published by . This book was released on 1985 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Yasuo Tanaka
Publisher :
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.3/5 (91 download)
Download or read book Japan--U.S. Seminar on Galactic and Extragalactic X-ray Sources written by Yasuo Tanaka and published by . This book was released on 1986 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard Fred Mushotzky
Publisher :
ISBN 13 :
Total Pages : 346 pages
Book Rating : 4.:/5 (318 download)
Download or read book Observations of Hard X-rays from Extragalactic Objects written by Richard Fred Mushotzky and published by . This book was released on 1976 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Giacconi
Publisher : Springer Science & Business Media
ISBN 13 : 9401021058
Total Pages : 456 pages
Book Rating : 4.4/5 (1 download)
Download or read book X-Ray Astronomy written by R. Giacconi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was about fourteen years ago that some of us became intrigued with the idea of searching the sky for X-ray and gamma-ray sources other than the Sun, the only celestial emitter of high-energy photons known at that time. It was, of course, clear that an effort in this direction would not have been successful unless there occurred, somewhere in space, processes capable of producing high-energy photons much more efficiently than the processes responsible for the radiative emission of the Sun or of ordinary stars. The possible existence of such processes became the subject of much study and discussion. As an important part of this activity, I wish to recall a one-day conference on X-ray astronomy held at the Smithsonian Astrophysical Observatory in 1960. The theoretical predictions did not provide much encouragement. While several 'unusual' celestial objects were pin-pointed as possible, or even likely, sources of X-rays, it did not look as if any of them would be strong enough to be observable with instru mentation not too far beyond the state of the art. Fortunately, we did not allow our selves to be dissuaded. As far as I am personally concerned, I must admit that my main motivation for pressing forward was a deep-seated faith in the boundless re sourcefulness of nature, which so often leaves the most daring imagination of man far behind.
Author : Elizabeth Post
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (122 download)
Download or read book Variability of the Unresolved X-Ray Background written by Elizabeth Post and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The cosmic x-ray background is diffuse, uniform x-ray radiation originating from outside our galaxy. Over the past several decades since its discovery, much of it has been resolved into discrete sources. However, a fraction of the x-ray background still remains unresolved. This remaining fraction is composed of sources from the very early universe, and high energy processes from this time period have major impacts on the modern universe. We cannot observe these sources directly, but we can observe how the unresolved x-ray background varies over time. Sources such as active galactic nuclei are known to have variable fluctuations in brightness while galaxies do not, so by measuring the variability in brightness of individual x-ray background pixels over time, we can infer whether or not it is comprised of mostly active galactic nuclei or galaxies. We analyze x-ray images of the same area of sky taken at different points in time and measure the standard deviation of individual pixels in order to measure how they vary in brightness over time. We compare this to a mock dataset generated using the average pixel value of our experimental dataset following a random Poisson distribution that simulates a non-variable x-ray background. Our results indicate that the unresolved cosmic x-ray background is not variable, thus we infer that it is most likely primarily due to galaxies from the very early universe. This has significant cosmological implications because these are likely to be x-rays radiated from the very first generation of stars. Studying the unresolved cosmic x-ray background provides insight into what sort of high energy processes occurred in the early universe and how those processes shaped the universe that we observe today.
Author : H. Bradt
Publisher : Springer Science & Business Media
ISBN 13 : 9401025851
Total Pages : 323 pages
Book Rating : 4.4/5 (1 download)
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.
Author : Peter W. Sanford
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 480 pages
Book Rating : 4.:/5 (42 download)
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:
Author : D.S. Heeschen
Publisher : Springer Science & Business Media
ISBN 13 : 9400977816
Total Pages : 484 pages
Book Rating : 4.4/5 (9 download)
Download or read book Extragalactic Radio Sources written by D.S. Heeschen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Symposium 97, Extragalactic Radio Sources, was held at Albuquerque, New Mexico August 3-7, 1981. It was co-sponsored by IAU Commissions 28, 40, 47 and 48 and by URSI Commission J. Financial and organizational support were provided by the National Radio Astronomy Observatory, the University of New Mexico, and the National Science Foundation. A wide variety of interesting objects and phenomena can be covered under the heading "Extragalactic Radio Sources", and a diverse set of topics was in fact discussed at the symposium. Radio galaxies, quasars, Seyfert galaxies and BL Lacertids received the most attention, but normal galaxies, the galactic center, and even SS433 were also discussed. While the unifying theme of the symposium was radio emission, studies at all wavelengths--X-ray, UV, optical, IR, and radio--were included. In general, the emphasis was on individual objects and the physical processes associated with them, but there were also papers on statistical studies and cosmology. The symposium was attended by 209 scientists from 18 countries.
Author : U. Esser
Publisher : Springer Science & Business Media
ISBN 13 : 3662123614
Total Pages : 1110 pages
Book Rating : 4.6/5 (621 download)
Download or read book Literature 1987, Part 2 written by U. Esser and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts aims to present a comprehensive documen tation of the literature concerning all aspects of astronomy, astrophysies, and their border fields. It is devoted to the recording, summarizing, and indexing of the relevant publications throughout the world. Astronomy and Astrophysics Abstracts is prepared by a special department of the Astronomisches Rechen-Institut under the auspices of the International Astronomical Union. Volume 44 records literature published in 1987 and received before February 15, 1988. Some older documents which we received late and which are not surveyed in earlier volumes are inc1uded too. We acknowledge with thanks contributions of our colleagues all over the world. We also express our gratitude to all organiza tions, observatories, and publishers which provide us with complimentary copies of their publications. Dr. Siegfried Böhme retired from his duties as co-editor of Astronomy and Astro physics Abstracts on December 31, 1987. Since 1950 he partieipated in the biblio graphie work of the institute. He served as a reviewer for the Astronomischer Jahresbericht and became one of the editors of Astronomy and Astrophysics Ab stracts in 1969. After his retirement in 1975 he took care of, particularly, the Russian literature on a voluntary basis for 12 years. It is a pleasure to thank Siegfried Böhme for his valuable contributions. Starting with Volume 33, all the recording, correction, and data processing work was done by means of computers. The recording was done by our technical staff members Ms. Helga Ballmann, Ms. Christiane Jehn, Ms. Monika Kohl, Ms.
Author : William Simon Paciesas
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.:/5 (318 download)
Download or read book Hard X-ray Variability in Binary X-ray Sources written by William Simon Paciesas and published by . This book was released on 1978 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nicholas Ernest White
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (926 download)
Download or read book The Variability of Several Galactic X-ray Sources written by Nicholas Ernest White and published by . This book was released on 1977 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : L. Gratton
Publisher : Springer Science & Business Media
ISBN 13 : 9401033110
Total Pages : 435 pages
Book Rating : 4.4/5 (1 download)
Download or read book Non-Solar X- and Gamma-Ray Astronomy written by L. Gratton 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: Proceedings of IAU Symposium No. 87 held in Rome, Italy, May 8-10, 1969
Author : K.S. Cheng
Publisher : Springer Science & Business Media
ISBN 13 : 1402022565
Total Pages : 412 pages
Book Rating : 4.4/5 (2 download)
Download or read book Cosmic Gamma-Ray Sources written by K.S. Cheng and published by Springer Science & Business Media. This book was released on 2012-11-03 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gamma-ray astronomy has undergone an enormous progress in the last 15 years. The success of satellite experiments like NASA's Comp ton Gamma-Ray Observatory and ESA's INTEGRAL mission, as well as of ground-based instruments have open new views into the high-energy Universe. Different classes of cosmic gamma-ray sources have been now detected at different energies, in addition to young radio pulsars and gamma-ray bursts, the classical ones. The new sources include radio quiet pulsars, microquasars, supernova remnants, starburst galaxies, ra dio galaxies, flat-spectrum radio quasars, and BL Lacertae objects. A large number of unidentified sources strongly suggests that this brief enumeration is far from complete. Gamma-ray bursts are now estab lished as extragalactic sources with tremendous energy output. There is accumulating evidence supporting the idea that massive stars and star forming regions can accelerate charged particles up to relativistic ener gies making them gamma-ray sources. Gamma-ray astronomy has also proved to be a powerful tool for cosmology imposing constraints to the background photon fields that can absorb the gamma-ray flux from dis tant sources. All this has profound implications for our current ideas about how particles are accelerated and transported in both the local and distant U niverse. The evolution of our knowledge on the gamma-ray sky has been so fast that is not easy for the non-specialist scientist and the graduate student to be aware of the full potential of this field or to grasp the fundamentals of a given topic in order to attempt some original contribution.
Author : R. Giacconi
Publisher : Springer Science & Business Media
ISBN 13 : 9400984596
Total Pages : 331 pages
Book Rating : 4.4/5 (9 download)
Download or read book X-Ray Astronomy with the Einstein Satellite written by R. Giacconi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meeting of the High Energy Astrophysics Division of the American Astronomical Society, held in Cambridge, Massachusetts on January 28- 30, 1980, marks the coming of age of X-ray astronomy. In the 18 years since the discovery of the first extrasolar X-ray source, Sco X-l, the field has experienced an extremely rapid instrumentation development culminating with the launch on November 13, 1978 of the Einstein Observatory (HEAO-2) which first introduced the use of high resolution imaging telescopes to the study of galactic and extragalactic X-ray sources. The Einstein Observatory instruments can detect sources as faint as 10-7 Sco X-lor about 17 magnitudes fainter. The technological developments in the field have been paralleled by a host of new discoveries: in the early 1960's the detection of 9 "X-ray stars", objects 10 times more luminous in X-rays than the Sun and among the brightest stellar objects at all wavelengths; in the late 1960's and early 1970's the discovery of the nature of such systems which were identified as collapsed stars (neutron stars and black holes) in mass exchange binary systems, and the detection of the first few extragalactic sources.
