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Author: Didier Barret
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
SIGMA, PREMIER TELESCOPE SPATIAL D'IMAGERIE GAMMA, A ETE LANCE A BORD DU SATELLITE SOVIETIQUE GRANAT LE 1ER DECEMBRE 1989, DEPUIS LA BASE DE BAIKONOUR. SIGMA REALISE DES IMAGES DE LA VOUTE CELESTE DANS LA GAMME D'ENERGIE ALLANT DE 30 KEV A 1.3 MEV, AVEC UNE RESOLUTION ANGULAIRE D'ENVIRON 15 MINUTES D'ARC ET UNE PRECISION DE LOCALISATION DE 1 A 2 MINUTES. DANS LA GAMME D'ENERGIE CONSIDEREE, LA DIFFUSION COMPTON ETANT LE PROCESSUS D'INTERACTION DOMINANT POUR LES PHOTONS, LA REPONSE SPECTRALE DE SIGMA A UNE SOURCE MONOENERGETIQUE E0 EST UN CONTINUUM DE FORME COMPLEXE, S'ETALANT DE 30 KEV A E0. DE CE FAIT, RESTITUER LES SPECTRES CONTINUS DES SOURCES OBSERVEES, A PARTIR DES SPECTRES DETECTES NECESSITE UNE CONNAISSANCE PRECISE DE LA REPONSE SPECTRALE DE L'INSTRUMENT. DANS LE CAS DE SIGMA, LA REPONSE SPECTRALE A ETE MODELISEE A L'AIDE DE SIMULATIONS MONTE CARLO. LA MODELISATION DE L'ENSEMBLE DU TELESCOPE SIGMA ET LA VALIDATION DU MODELE SE SONT APPUYEES SUR DES MESURES EXPERIMENTALES EFFECTUEES EN LABORATOIRE AVANT ET APRES LE LANCEMENT. NOUS PRESENTERONS LES RESULTATS DE CES SIMULATIONS AYANT ABOUTI A LA REALISATION DE LA MATRICE DE CALIBRATION UTILISEE ACTUELLEMENT DANS LE TRAITEMENT DES DONNEES VOL. LA MAJEURE PARTIE DES SOURCES DETECTEES PAR SIGMA EST CONSTITUEE DE SYSTEMES BINAIRES DE FAIBLE MASSE OU L'OBJET COMPACT EST, SOIT UNE ETOILE A NEUTRONS, SOIT UN TROU NOIR. NOUS PRESENTERONS LES RESULTATS DE SIGMA CONCERNANT TROIS DE CES SOURCES: TERZAN II, KS1731-260, ET TRAX-1. NOUS INSISTERONS TOUT PARTICULIEREMENT SUR LES PROPRIETES SPECTRALES DES SYSTEMES AVEC ETOILE A NEUTRONS, LES OBSERVATIONS DE SIGMA AYANT DEMONTRE POUR LA PREMIERE FOIS LEUR APTITUDE A EMETTRE AU-DELA DE 100 KEV. GRACE A SIGMA, L'EMISSION HAUTE ENERGIE (E>30 KEV) N'EST PLUS CONSIDEREE COMME UNE PROPRIETE SPECTRALE CARACTERISANT UNIQUEMENT LES CANDIDATS TROU NOIR. A LA FIN DE SON EVOLUTION, UN SYSTEME BINAIRE DE FAIBLE MASSE AVEC ETOILE A NEUTRONS PEUT DONNER NAISSANCE A UN PULSAR MILLISECONDE. A PARTIR DES OBSERVATIONS SIGMA DE L'AMAS GLOBULAIRE 47 TOUCAN, NOUS DISCUTERONS DES DIFFERENTS MECANISMES D'EMISSION DE CES OBJETS, EN PARTICULIER CEUX LIES AUX PROCESSUS D'EVAPORATION DU COMPAGNON
Author: Didier Barret
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
SIGMA, PREMIER TELESCOPE SPATIAL D'IMAGERIE GAMMA, A ETE LANCE A BORD DU SATELLITE SOVIETIQUE GRANAT LE 1ER DECEMBRE 1989, DEPUIS LA BASE DE BAIKONOUR. SIGMA REALISE DES IMAGES DE LA VOUTE CELESTE DANS LA GAMME D'ENERGIE ALLANT DE 30 KEV A 1.3 MEV, AVEC UNE RESOLUTION ANGULAIRE D'ENVIRON 15 MINUTES D'ARC ET UNE PRECISION DE LOCALISATION DE 1 A 2 MINUTES. DANS LA GAMME D'ENERGIE CONSIDEREE, LA DIFFUSION COMPTON ETANT LE PROCESSUS D'INTERACTION DOMINANT POUR LES PHOTONS, LA REPONSE SPECTRALE DE SIGMA A UNE SOURCE MONOENERGETIQUE E0 EST UN CONTINUUM DE FORME COMPLEXE, S'ETALANT DE 30 KEV A E0. DE CE FAIT, RESTITUER LES SPECTRES CONTINUS DES SOURCES OBSERVEES, A PARTIR DES SPECTRES DETECTES NECESSITE UNE CONNAISSANCE PRECISE DE LA REPONSE SPECTRALE DE L'INSTRUMENT. DANS LE CAS DE SIGMA, LA REPONSE SPECTRALE A ETE MODELISEE A L'AIDE DE SIMULATIONS MONTE CARLO. LA MODELISATION DE L'ENSEMBLE DU TELESCOPE SIGMA ET LA VALIDATION DU MODELE SE SONT APPUYEES SUR DES MESURES EXPERIMENTALES EFFECTUEES EN LABORATOIRE AVANT ET APRES LE LANCEMENT. NOUS PRESENTERONS LES RESULTATS DE CES SIMULATIONS AYANT ABOUTI A LA REALISATION DE LA MATRICE DE CALIBRATION UTILISEE ACTUELLEMENT DANS LE TRAITEMENT DES DONNEES VOL. LA MAJEURE PARTIE DES SOURCES DETECTEES PAR SIGMA EST CONSTITUEE DE SYSTEMES BINAIRES DE FAIBLE MASSE OU L'OBJET COMPACT EST, SOIT UNE ETOILE A NEUTRONS, SOIT UN TROU NOIR. NOUS PRESENTERONS LES RESULTATS DE SIGMA CONCERNANT TROIS DE CES SOURCES: TERZAN II, KS1731-260, ET TRAX-1. NOUS INSISTERONS TOUT PARTICULIEREMENT SUR LES PROPRIETES SPECTRALES DES SYSTEMES AVEC ETOILE A NEUTRONS, LES OBSERVATIONS DE SIGMA AYANT DEMONTRE POUR LA PREMIERE FOIS LEUR APTITUDE A EMETTRE AU-DELA DE 100 KEV. GRACE A SIGMA, L'EMISSION HAUTE ENERGIE (E>30 KEV) N'EST PLUS CONSIDEREE COMME UNE PROPRIETE SPECTRALE CARACTERISANT UNIQUEMENT LES CANDIDATS TROU NOIR. A LA FIN DE SON EVOLUTION, UN SYSTEME BINAIRE DE FAIBLE MASSE AVEC ETOILE A NEUTRONS PEUT DONNER NAISSANCE A UN PULSAR MILLISECONDE. A PARTIR DES OBSERVATIONS SIGMA DE L'AMAS GLOBULAIRE 47 TOUCAN, NOUS DISCUTERONS DES DIFFERENTS MECANISMES D'EMISSION DE CES OBJETS, EN PARTICULIER CEUX LIES AUX PROCESSUS D'EVAPORATION DU COMPAGNON
Author:
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 756
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Author: Keith Arnaud
Publisher: Cambridge University Press
ISBN: 1139502565
Category : Science
Languages : en
Pages : 207
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Book Description
Modern x-ray data, available through online archives, are important for many astronomical topics. However, using these data requires specialized techniques and software. Written for graduate students, professional astronomers and researchers who want to start working in this field, this book is a practical guide to x-ray astronomy. The handbook begins with x-ray optics, basic detector physics and CCDs, before focussing on data analysis. It introduces the reduction and calibration of x-ray data, scientific analysis, archives, statistical issues and the particular problems of highly extended sources. The book describes the main hardware used in x-ray astronomy, emphasizing the implications for data analysis. The concepts behind common x-ray astronomy data analysis software are explained. The appendices present reference material often required during data analysis.
Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781723889707
Category : Science
Languages : en
Pages : 66
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Author: Hermann Kolanoski
Publisher: Oxford University Press
ISBN: 0191899232
Category : Science
Languages : en
Pages : 949
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Book Description
This book describes the fundamentals of particle detectors as well as their applications. Detector development is an important part of nuclear, particle and astroparticle physics, and through its applications in radiation imaging, it paves the way for advancements in the biomedical and materials sciences. Knowledge in detector physics is one of the required skills of an experimental physicist in these fields. The breadth of knowledge required for detector development comprises many areas of physics and technology, starting from interactions of particles with matter, gas- and solid-state physics, over charge transport and signal development, to elements of microelectronics. The book's aim is to describe the fundamentals of detectors and their different variants and implementations as clearly as possible and as deeply as needed for a thorough understanding. While this comprehensive opus contains all the materials taught in experimental particle physics lectures or modules addressing detector physics at the Master's level, it also goes well beyond these basic requirements. This is an essential text for students who want to deepen their knowledge in this field. It is also a highly useful guide for lecturers and scientists looking for a starting point for detector development work.
Author: Malcolm S. Longair
Publisher: Cambridge University Press
ISBN: 1139494546
Category : Science
Languages : en
Pages : 885
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Book Description
Providing students with an in-depth account of the astrophysics of high energy phenomena in the Universe, the third edition of this well-established textbook is ideal for advanced undergraduate and beginning graduate courses in high energy astrophysics. Building on the concepts and techniques taught in standard undergraduate courses, this textbook provides the astronomical and astrophysical background for students to explore more advanced topics. Special emphasis is given to the underlying physical principles of high energy astrophysics, helping students understand the essential physics. The third edition has been completely rewritten, consolidating the previous editions into one volume. It covers the most recent discoveries in areas such as gamma-ray bursts, ultra-high energy cosmic rays and ultra-high energy gamma rays. The topics have been rearranged and streamlined to make them more applicable to a wide range of different astrophysical problems.
Author: H. Ögelman
Publisher: Springer Science & Business Media
ISBN: 9400922736
Category : Science
Languages : en
Pages : 760
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Book Description
The idea for organizing an Advanced Study Institute devoted largely to neutron star timing arose independently in three places, at Istanbul, Garching and Amster dam; when we became aware of each other's ideas we decided to join forces. The choice of a place for the Institute, in Turkey, appealed much to us all, and it was then quickly decided that Qe§me would be an excellent spot. When the preparations for the Institute started, early in 1987, we could not have guessed how timely the subject actually was. Of course, the recently dis covered QPO phenomena in accreting neutron stars and half a dozen binary and millisecond radio pulsars known at the time formed one of the basic motivations for organizing this Institute. But none of us could have guessed that later in 1987 we were to witness the wonderful discovery of the binary and millisecond radio pulsars in globular clusters and, -as if Nature wished to give us a special present for this the discovery in March 1988 of a millisecond pulsar in an eclipsing binary Institu- system, the first eclipsing radio pulsar ever found, and the second fastest in the sky! The discussion of this pulsar, its formation and fate was one of the highlights of this meeting, especially since its discoverers were among the participants of the Institute and could provide us with first-hand information.
Author: Charles Philip Sonett
Publisher: University of Arizona Press
ISBN: 9780816512973
Category : Science
Languages : en
Pages : 1040
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Book Description
An interdisciplinary approach to solar physics, as eighty-nine contributors trace the evolution of the Sun and provide a review of our current understanding of both its structure and its role in the origin and evolution of the solar system.
Author: Georg G. Raffelt
Publisher: University of Chicago Press
ISBN: 9780226702728
Category : Science
Languages : en
Pages : 692
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Book Description
Much of what we know about neutrinos is revealed by astronomical observations, and the same applies to the axion, a conjectured new particle that is a favored candidate for the main component of the dark matter of the universe.
Author: Yuri Ralchenko
Publisher: Springer
ISBN: 3319275143
Category : Science
Languages : en
Pages : 220
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Book Description
This book provides a compact yet comprehensive overview of recent developments in collisional-radiative (CR) modeling of laboratory and astrophysical plasmas. It describes advances across the entire field, from basic considerations of model completeness to validation and verification of CR models to calculation of plasma kinetic characteristics and spectra in diverse plasmas. Various approaches to CR modeling are presented, together with numerous examples of applications. A number of important topics, such as atomic models for CR modeling, atomic data and its availability and quality, radiation transport, non-Maxwellian effects on plasma emission, ionization potential lowering, and verification and validation of CR models, are thoroughly addressed. Strong emphasis is placed on the most recent developments in the field, such as XFEL spectroscopy. Written by leading international research scientists from a number of key laboratories, the book offers a timely summary of the most recent progress in this area. It will be a useful and practical guide for students and experienced researchers working in plasma spectroscopy, spectra simulations, and related fields.
