Intermittent And Transient Behavior In Cygnus X 1 And Grs 1915 105 X Ray Emission

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Intermittent and Transient Behavior in Cygnus X-1 and GRS 1915+105 X-ray Emission

Daniel V. Engovatov
Intermittent and Transient Behavior in Cygnus X 1 and GRS 1915 105 X ray Emission Book PDF

Author : Daniel V. Engovatov
Publisher : Stanford University
Page : 126 pages
File Size : 40,5 Mb
Release : 2011
Category : Electronic
ISBN : STANFORD:tk101gq8333

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Intermittent and Transient Behavior in Cygnus X-1 and GRS 1915+105 X-ray Emission by Daniel V. Engovatov Pdf

Much work has been done on trying to gain insight into the dynamics of accreting systems, such as black hole and neutron star binaries, by analyzing timing measurements from X-ray telescopes. In this thesis we present a novel approach to this problem using a kurtosis measure of the wavelet distribution obtained from the light curve to quantify the presence of intermittent activity. This method is applied to large RXTE data sets for GRS 1915+105, and Cygnus X-1. We demonstrate a new approach to reveal bursting modes. Negative correlation between the presence of a low frequency QPO in the Cygnus X-1 Fourier power spectrum and a wavelet kurtosis indicator of temporal intermittency is observed. A possible interpretation of this anti-correlation is developed using a "dripping handrail" transient chaos model.

The Jet Paradigm

Tomaso Belloni
The Jet Paradigm Book PDF

Author : Tomaso Belloni
Publisher : Springer
Page : 296 pages
File Size : 42,6 Mb
Release : 2009-12-21
Category : Science
ISBN : 9783540769378

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The Jet Paradigm by Tomaso Belloni Pdf

The discovery of the ?rst case of superluminal radio jets in our galaxy in 1994 from the bright and peculiar X-ray source GRS 1915+105 has opened the way to a major shift in the direction of studies of stellar-mass accreting binaries. The past decade has seen an impressive increase in multi-wavelength studies. It is now known that all black hole binaries in our galaxy are radio sources and most likely their radio emission originates from a powerful jet. In addition to the spectacular events related to the ejection of superluminal jets, steady jets are known from many systems. Compared with their supermassive cousins, the nuclei of active galaxies, stellar-mass X-ray binaries have the advantage of varying on time scales accessible within a human life (sometimes even much shorter than a second). This has led to the ?rst detailed studies of the relation between accretion and ejection. It is even possible that, excluding their “soft” periods, the majority of the power in gal- tic sources lies in the jets and not in the accretion ?ows. This means that until a few years ago we were struggling with a physical problem, accretion onto compact objects, without considering one of the most important components of the system. Models that associate part of the high-energy emission and even the fast aperiodic variability to the jet itself are now being proposed and jets can no longer be ignored.

Timing Neutron Stars: Pulsations, Oscillations and Explosions

Tomaso M. Belloni,Mariano Méndez,Chengmin Zhang
Timing Neutron Stars Pulsations Oscillations and Explosions Book PDF

Author : Tomaso M. Belloni,Mariano Méndez,Chengmin Zhang
Publisher : Springer Nature
Page : 335 pages
File Size : 54,5 Mb
Release : 2020-10-23
Category : Science
ISBN : 9783662621103

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Timing Neutron Stars: Pulsations, Oscillations and Explosions by Tomaso M. Belloni,Mariano Méndez,Chengmin Zhang Pdf

Neutron stars, whether isolated or in a binary system, display a varied and complex phenomenology, often accompanied by extreme variability of many time scales, which takes the form of pulsations due to the object rotation, quasi-periodicities associated to accretion of matter, and explosions due to matter accreted on the surface or to starquakes of highly magnetized objects. This book gives an overview of the current observational and theoretical standpoint in the research on the physics under the extreme conditions that neutron stars naturally provide. The six chapters explore three physical regions of a neutron star: the space around it, where accretion and pulsar companions allow testing of general relativity its surface, where millisecond pulsation and X-ray burts provide clues about general relativistic effects and the equation of state of neutron matter its interior, of course, inaccessible to direct observations, can nevertheless, be probed with all observational parameters related to neutron star variability.

Fifty Years of Quasars

Mauro D'Onofrio,Paola Marziani,Jack W. Sulentic
Fifty Years of Quasars Book PDF

Author : Mauro D'Onofrio,Paola Marziani,Jack W. Sulentic
Publisher : Springer Science & Business Media
Page : 613 pages
File Size : 47,7 Mb
Release : 2012-09-14
Category : Science
ISBN : 9783642275647

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Fifty Years of Quasars by Mauro D'Onofrio,Paola Marziani,Jack W. Sulentic Pdf

The 50th anniversary of the discovery of quasars in 1963 presents an interesting opportunity to ask questions about the current state of quasar research. Formatted as a series of interviews with noted researchers in the field, each of them asked to address a specific set of questions covering topics selected by the editors, this book deals with the historical development of quasar research and discusses how advances in instrumentation and computational capabilities have benefitted quasar astronomy and have changed our basic understanding of quasars. In the last part of the book the interviews address the current topic of the role of quasars in galaxy evolution. They summarise open issues in understanding active galactic nuclei and quasars and present an outlook regarding what future observational facilities both on the ground and in space might reveal. Its interview format, the fascinating topic of quasars and black holes, and the lively recollections and at times controversial views of the contributors make this book both rewarding and a pleasure to read!

The Universe in Gamma Rays

Volker Schönfelder
The Universe in Gamma Rays Book PDF

Author : Volker Schönfelder
Publisher : Springer Science & Business Media
Page : 418 pages
File Size : 47,7 Mb
Release : 2013-03-14
Category : Science
ISBN : 9783662045930

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The Universe in Gamma Rays by Volker Schönfelder Pdf

After describing cosmic gamma-ray production and absorption, the instrumentation used in gamma-ray astronomy is explained. The main part of the book deals with astronomical results, including the somewhat surprising result that the gamma-ray sky is continuously changing.

Pulsar Astronomy

Andrew Lyne,Francis Graham-Smith
Pulsar Astronomy Book PDF

Author : Andrew Lyne,Francis Graham-Smith
Publisher : Cambridge University Press
Page : 375 pages
File Size : 51,5 Mb
Release : 2012-03
Category : Science
ISBN : 9781107010147

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Pulsar Astronomy by Andrew Lyne,Francis Graham-Smith Pdf

Now in its fourth edition, Pulsar Astronomy provides a thoroughly revised and updated introduction to the field of pulsar astronomy.

Astrophysical Black Holes

Francesco Haardt,Vittorio Gorini,Ugo Moschella,Aldo Treves,Monica Colpi
Astrophysical Black Holes Book PDF

Author : Francesco Haardt,Vittorio Gorini,Ugo Moschella,Aldo Treves,Monica Colpi
Publisher : Springer
Page : 314 pages
File Size : 47,8 Mb
Release : 2015-11-03
Category : Science
ISBN : 9783319194165

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Astrophysical Black Holes by Francesco Haardt,Vittorio Gorini,Ugo Moschella,Aldo Treves,Monica Colpi Pdf

Based on graduate school lectures in contemporary relativity and gravitational physics, this book gives a complete and unified picture of the present status of theoretical and observational properties of astrophysical black holes. The chapters are written by internationally recognized specialists. They cover general theoretical aspects of black hole astrophysics, the theory of accretion and ejection of gas and jets, stellar-sized black holes observed in the Milky Way, the formation and evolution of supermassive black holes in galactic centers and quasars as well as their influence on the dynamics in galactic nuclei. The final chapter addresses analytical relativity of black holes supporting theoretical understanding of the coalescence of black holes as well as being of great relevance in identifying gravitational wave signals. With its introductory chapters the book is aimed at advanced graduate and post-graduate students, but it will also be useful for specialists.

Yearbook on Space Policy 2016

Cenan Al-Ekabi,Stefano Ferretti
Yearbook on Space Policy 2016 Book PDF

Author : Cenan Al-Ekabi,Stefano Ferretti
Publisher : Springer
Page : 328 pages
File Size : 55,9 Mb
Release : 2018-02-22
Category : Technology & Engineering
ISBN : 9783319724652

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Yearbook on Space Policy 2016 by Cenan Al-Ekabi,Stefano Ferretti Pdf

The Yearbook on Space Policy, edited by the European Space Policy Institute (ESPI), is the reference publication analysing space policy developments. Each year it presents issues and trends in space policy and the space sector as a whole. Its scope is global and its perspective is European. The Yearbook also links space policy with other policy areas. It highlights specific events and issues, and provides useful insights, data and information on space activities. The first part of the Yearbook sets out a comprehensive overview of the economic, political, technological and institutional trends that have affected space activities. The second part of the Yearbook offers a more analytical perspective on the yearly ESPI theme and consists of external contributions written by professionals with diverse backgrounds and areas of expertise. The third part of the Yearbook carries forward the character of the Yearbook as an archive of space activities. The Yearbook is designed for government decision-makers and agencies, industry professionals, as well as the service sectors, researchers and scientists and the interested public.

Physics of Relativistic Objects in Compact Binaries: from Birth to Coalescence

Monica Colpi,Piergiorgio Casella,Vittorio Gorini,Ugo Moschella,Andrea Possenti
Physics of Relativistic Objects in Compact Binaries from Birth to Coalescence Book PDF

Author : Monica Colpi,Piergiorgio Casella,Vittorio Gorini,Ugo Moschella,Andrea Possenti
Publisher : Springer Science & Business Media
Page : 386 pages
File Size : 46,6 Mb
Release : 2009-03-28
Category : Science
ISBN : 9781402092640

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Physics of Relativistic Objects in Compact Binaries: from Birth to Coalescence by Monica Colpi,Piergiorgio Casella,Vittorio Gorini,Ugo Moschella,Andrea Possenti Pdf

A very attractive feature of the theory of general relativity is that it is a perfectexampleofa“falsi?able”theory:notunableparameterispresentinthe theory and therefore even a single experiment incompatible with a prediction of the theory would immediately lead to its inevitable rejection, at least in the physical regime of application of the aforementioned experiment. This fact provides additional scienti?c value to one of the boldest and most fascinating achievements of the human intellect ever, and motivates a wealth of e?orts in designing and implementing tests aimed at the falsi?cation of the theory. The ?rst historical test on the theory has been the de?ection of light gr- ing the solar surface (Eddington 1919): the compatibility of the theory with this ?rst experiment together with its ability to explain the magnitude of the perihelion advance of Mercury contributed strongly to boost acceptance and worldwideknowledge.However,technologicallimitations preventedphysicists from setting up more constraining tests for several decades after the formu- tion of the theory. In fact, a relevant problem with experimental general r- ativity is that the predicted deviations from the Newtonian theory of gravity areverysmallwhentheexperimentsarecarriedoutinterrestriallaboratories.

Multiple Messengers and Challenges in Astroparticle Physics

Roberto Aloisio,Eugenio Coccia,Francesco Vissani
Multiple Messengers and Challenges in Astroparticle Physics Book PDF

Author : Roberto Aloisio,Eugenio Coccia,Francesco Vissani
Publisher : Springer
Page : 552 pages
File Size : 49,5 Mb
Release : 2018-02-27
Category : Science
ISBN : 9783319654256

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Multiple Messengers and Challenges in Astroparticle Physics by Roberto Aloisio,Eugenio Coccia,Francesco Vissani Pdf

This book, designed as a tool for young researchers and graduate students, reviews the main open problems and research lines in various fields of astroparticle physics: cosmic rays, gamma rays, neutrinos, cosmology, and gravitational physics. The opening section discusses cosmic rays of both galactic and extragalactic origin, examining experimental results, theoretical models, and possible future developments. The basics of gamma-ray astronomy are then described, including the detection methods and techniques. Galactic and extragalactic aspects of the field are addressed in the light of recent discoveries with space-borne and ground-based detectors. The review of neutrinos outlines the status of the investigations of neutrino radiation and brings together relevant formulae, estimations, and background information. Three complementary issues in cosmology are examined: observable predictions of inflation in the early universe, effects of dark energy/modified gravity in the large-scale structure of the universe, and neutrinos in cosmology and large-scale structures. The closing section on gravitational physics reviews issues relating to quantum gravity, atomic precision tests, space-based experiments, the strong field regime, gravitational waves, multi-messengers, and alternative theories of gravity.

Yearbook on Space Policy 2017

Edward Burger,Giulia Bordacchini
Yearbook on Space Policy 2017 Book PDF

Author : Edward Burger,Giulia Bordacchini
Publisher : Unknown
Page : 128 pages
File Size : 50,8 Mb
Release : 2019
Category : POLITICAL SCIENCE
ISBN : 3030054187

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Yearbook on Space Policy 2017 by Edward Burger,Giulia Bordacchini Pdf

The book describes the recent trends in space policy and the space sector overall. While maintaining a global scope with a European perspective, it links space policy with other policy areas, highlights major events, and provides insights on the latest data. The Yearbook includes the proceedings of ESPI's 12th Autumn Conference, which discussed the growing importance of Security in Outer Space and the stakes for civilian space programmes in the public and private sectors. Bringing together satellite operators, SMEs, European and American institutions, and think tanks, the Autumn Conference served as platform for fresh insights on security in outer space and the potential of transatlantic relations to address its challenges. The Yearbook also includes executive summaries of ESPI's work in 2017 as well as ESPI's 2017 Executive Briefs, covering topics such as suborbital spaceflight, super heavy lift launch vehicles, collaboration with China, and the delimitation of outer space. All in all, the book gives a detailed review of space policy developments worldwide, contextualised with information about national-level space industries and activity and broader political and economic conditions. The readership is expected to include the staff of space agencies, the space industry, and the space law and policy research community.

High-Energy Emission from Pulsars and their Systems

Nanda Rea,Diego F. Torres
High Energy Emission from Pulsars and their Systems Book PDF

Author : Nanda Rea,Diego F. Torres
Publisher : Springer Science & Business Media
Page : 656 pages
File Size : 44,9 Mb
Release : 2011-02-04
Category : Science
ISBN : 9783642172519

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High-Energy Emission from Pulsars and their Systems by Nanda Rea,Diego F. Torres Pdf

The aim of the inaugural meeting of the Sant Cugat Forum on Astrophysics was to address, in a global context, the current understanding of and challenges in high-energy emissions from isolated and non-isolated neutron stars, and to confront the theoretical picture with observations of both the Fermi satellite and the currently operating ground-based Cherenkov telescopes. Participants have also discussed the prospects for possible observations with planned instruments across the multi-wavelength spectrum (e.g. SKA, LOFAR, E-VLT, IXO, CTA) and how they will impact our theoretical understanding of these systems. In keeping with the goals of the Forum, this book not only represents the proceedings of the meeting, but also a reflection on the state-of-the-art in the topic.

Relativistic Flows in Astrophysics

A.W. Guthmann,M. Georganopoulos,A. Marcowith,K. Manolakou
Relativistic Flows in Astrophysics Book PDF

Author : A.W. Guthmann,M. Georganopoulos,A. Marcowith,K. Manolakou
Publisher : Springer
Page : 246 pages
File Size : 41,6 Mb
Release : 2008-01-11
Category : Science
ISBN : 9783540460251

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Relativistic Flows in Astrophysics by A.W. Guthmann,M. Georganopoulos,A. Marcowith,K. Manolakou Pdf

1. 1 Schematic Picture of AGN Some galaxies are known to emit radiation with extremely high luminosities from a rather small volume in the ??ray, X-ray and UV continuum. Such active cores are the so-called Active Galactic Nuclei (AGN) and the radiation is commonly believed to be a result of gravitational energy released by matter spiraling around 9 a supermassive central black hole of about 10 M (see Fig. 1). Though the central engine which produces the enormous observed activity cannot be resolved observationally, a standard picture of an AGN has gradually emerged to explain the richness of the radiation spectra: • an accretion disk with radius from about 2 to 100 gravitational radii, R , g feeding the central black hole and emitting mainly in the UV and soft X-rays; • the broad line optically emitting clouds (BLR), which seem to be absent in 3 some sources (e. g. FRI, see hereafter) and extend up to a few 10 R from g the center.

Gamma-ray Astrophysics

Floyd William Stecker,Jacob I. Trombka
Gamma ray Astrophysics Book PDF

Author : Floyd William Stecker,Jacob I. Trombka
Publisher : Unknown
Page : 440 pages
File Size : 48,8 Mb
Release : 1973
Category : Astrophysics
ISBN : STANFORD:36105024707437

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Gamma-ray Astrophysics by Floyd William Stecker,Jacob I. Trombka Pdf

Conference papers on gamma ray astrophysics are summarized. Data cover the energy region from about 0.3 MeV to a few hundred GeV and theoretical models of production mechanisms that give rise to both galactic and extragalactic gamma rays.

Ultraviolet Radiation in the Solar System

M. Vázquez,A. Hanslmeier
Ultraviolet Radiation in the Solar System Book PDF

Author : M. Vázquez,A. Hanslmeier
Publisher : Springer Science & Business Media
Page : 387 pages
File Size : 55,7 Mb
Release : 2006-06-30
Category : Science
ISBN : 9781402037306

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Ultraviolet Radiation in the Solar System by M. Vázquez,A. Hanslmeier Pdf

In the history of science the opening up of a new observational or experimental window is always followed by an increase in knowledge of the subject concerned. This is also the case with the subject of this book, ultraviolet radiation (hereafter UV). In principle, the ultraviolet range might be just one more of these windows, of no particular importance. However, the energy per UV photon provides the main peculiarity, its magnitude being great enough to produce important ch- ical reactions in the atmospheres of planets and satellites, thereby a?ecting the transmission of this radiation to the ground. The Sun is the main natural source of UV radiation in the Solar System and our planet is the body where its in?uences can be best tested and the only one where its relation with life can be studied. However, the terrestrial atmosphere blocksmostofthephotonsinthiselectromagneticrangeandastronomershavehad to develop various techniques (balloons, planes and rockets) to cross this barrier and access the information. These tools have been used in parallel to investigate the physical properties of the terrestrial atmosphere and the interaction of its constituents with light. This book will addresses most of these topics.