[PDF] Mapping Correlation Of Two Point Sources In The Gamma Ray Sky eBook

Author :
Publisher :
Page : 6 pages
File Size : 45,44 MB
Release : 2015
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ISBN :

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The Fermi Gamma-Ray Space Telescope has been taking data on high energy photons or [gamma] rays since June 11th, 2008, and people have been cataloging and profiling point sources of these [gamma] rays ever since. After roughly one year of being in operation over 1400 sources were cataloged. Now, in 2015 we have 3033 sources cataloged. With the increasing amount of sources it's important to think about the limitations of likelihood analysis for highly correlated sources. In this paper I will present the problems of using likelihood analysis for sources that are highly correlated as well as show under what circumstances sources can be considered highly correlated. Dark matter over densities may show up as a point source, so it is a necessary step to learn how the two signals will interact to allow for a proper search for dark matter.

Author :
Publisher :
Page : 19 pages
File Size : 16,60 MB
Release : 2015
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In my research, I analyzed how two gamma-ray source models interact with one another when optimizing to fit data. This is important because it becomes hard to distinguish between the two point sources when they are close together or looking at low energy photons. The reason for the first is obvious, the reason why they become harder to distinguish at lower photon energies is the resolving power of the Fermi Gamma-Ray Space Telescope gets worse at lower energies. When the two point sources are highly correlated (hard to distinguish between), we need to change our method of statistical analysis. What I did was show that highly correlated sources have larger uncertainties associated with them, caused by an optimizer not knowing which point source's parameters to optimize. I also mapped out where their is high correlation for 2 different theoretical mass dark matter point sources so that people analyzing them in the future knew where they had to use more sophisticated statistical analysis.

Author : M. Signore
Publisher : Springer Science & Business Media
Page : 422 pages
File Size : 50,63 MB
Release : 2012-12-06
Category : Science
ISBN : 9401100675

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This volume consists of invited lectures and seminars presented at the NATO Advanced Study Institute "The Gamma Ray Sky with COMPTON GRO and SIGMA" , which was held at the Centre de Physique Theorique of Les Houches (France) in January / February 1994. The school has been planned by a Scientific Organizing Committee. It was organized with the aim of providing students and young researchers with an up-to-date account of the high-energy phenomena in the vicinity of compact objets and the diffuse gamma-ray backgrounds after the early results from the gamma-ray telescope SIGMA and the four instruments onboard COMPTON GRO (Gamma Ray Observatory) : BATSE (Burst and Transient Source Experiment),COMPTEL(Compto'l Telescope),EGRET (Energetic Gamma Ray Experiment Telescope) and OS SE(Oriented Scintillation Spectrometer Experiment) . It was attended by more than sixty researchers from many countries. The lectures and seminars represent a complete coverage of our present knowledge and understanding of: Gamma-ray backgrounds, Gamma-ray Burts,Active Galactic Nuclei,Galactic Compact Objects, Gamma-ray Spectroscopy, Instrumentation and observation techniques, etc ... Most of these lectures are reproduced in this volume. Unfortunately, a few lecturers have chosen not to submit their manuscript.

Author : The Cta Consortium
Publisher : World Scientific
Page : 365 pages
File Size : 33,46 MB
Release : 2018-12-31
Category : Science
ISBN : 9813270101

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This book summarizes the science to be carried out by the upcoming Cherenkov Telescope Array, a major ground-based gamma-ray observatory that will be constructed over the next six to eight years. The major scientific themes, as well as core program of key science projects, have been developed by the CTA Consortium, a collaboration of scientists from many institutions worldwide.CTA will be the major facility in high-energy and very high-energy photon astronomy over the next decade and beyond. CTA will have capabilities well beyond past and present observatories. Thus, CTA's science program is expected to be rich and broad and will complement other major multiwavelength and multimessenger facilities. This book is intended to be the primary resource for the science case for CTA and it thus will be of great interest to the broader physics and astronomy communities. The electronic version (e-book) is available in open access.

Author : Josep M. Paredes
Publisher : Springer Science & Business Media
Page : 496 pages
File Size : 37,57 MB
Release : 2007-11-12
Category : Science
ISBN : 140206117X

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This book provides a theoretical and observational overview of the state of the art of gamma-ray astrophysics, and their impact and connection with the physics of cosmic rays and neutrinos. With the aim of shedding new and fresh light on the problem of the nature of the gamma-ray sources, particularly those yet unidentified, this book summarizes contributions to a workshop that continues today.

Author : G.E. Morfill
Publisher : Springer Science & Business Media
Page : 338 pages
File Size : 48,88 MB
Release : 2012-12-06
Category : Science
ISBN : 9400972083

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This book contains the invited and contributed lectures presented at a meeting organised in the context of the XVIII general assembly ofthe IAU, held in Patras, August 19, 1982. Roughly one hundred scientists attended this meeting, the discussions were livel- sometimes heated - and the original time span allocated to the meeting was as a result, comfortably exceeded by about 50 % . The aim of this meeting was to determine the role of galactic gamma-ray astronomy within the general concept of galactic astrophysics. The timing, at the end of the COS-B mission, was regarded as opportune, because it gives interested astrophysicists the possibility for interdisciplinary studies using the existing gamma-ray data base (e.g. comparison with infrared, radio, X-ray, etc. astronomies), as well as for theoretical studies. The next generation of gamma-ray detectors will probably not be in operation for another 5 to 10 years, and therefore it is hoped that the proceeding of this meeting can be used (in the intermediate time) as a basis for further studies, as a stimulation for more theoretical work and as an important contribution for defining the aims and operation of future gamma-ray missions. The interrelationship with other branches of astronomy, the astrophysical implications and the study of relevant physical processes using available measurements in the near-Earth environment were important results of the meeting. Many persons contributed to the success of the meeting, in particular all those who either presented a contribution and/or took part in the discussions.

Author : Roland Diehl
Publisher : Springer Science & Business Media
Page : 577 pages
File Size : 17,50 MB
Release : 2010-10-02
Category : Science
ISBN : 3642126979

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This book introduces the reader to the field of nuclear astrophysics, i.e. the acquisition and reading of measurements on unstable isotopes in different parts of the universe. The authors explain the role of radioactivities in astrophysics, discuss specific sources of cosmic isotopes and in which special regions they can be observed. More specifically, the authors address stars of different types, stellar explosions which terminate stellar evolutions, and other explosions triggered by mass transfers and instabilities in binary stars. They also address nuclear reactions and transport processes in interstellar space, in the contexts of cosmic rays and of chemical evolution. A special chapter is dedicated to the solar system which even provides material samples. The book also contains a description of key tools which astrophysicists employ in those particular studies and a glossary of key terms in astronomy with radioactivities.

Author : Chandra Mouli M S
Publisher : Notion Press
Page : 1705 pages
File Size : 32,35 MB
Release : 2019-12-03
Category : Self-Help
ISBN : 1646789385

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Making one understand the existing realities at the basic level is an enormous task, and when it comes to the thought process, it appears to be abstract for the common man. For those who are seekers of truth and reality, Actualization of Thought can take them to a different world. Chandra Mouli M S has undertaken the most challenging journey of comparative study of the Vedic science, philosophy and psychology, through the Bruhati Shahasra. There have been several studies trying to bring out the contents of the Vedas in different contexts suitable for the contemporary audience. But so far we have not come across anything that has Vedic science, philosophy and psychology on one platform. This unique, successful effort has been definitely a strenuous, time consuming one of several years. Apart from citing several authorities on the subjects right from Vedic time to contemporary, a proper perspective is projected to realize what happens while actualization of thoughts takes place. One will find physiological and pathological explanation, which enable the neurotransmitters right from Patanalis Yoga Sutras to Dr. Deepak Chopra’s clinical studies. The book will be of great help to future seekers and researchers as there is no alternative substructure material available. - Prasad Parichaya Foundation, Bangalore.