Very High Energy Emission From The Galactic Center With Veritas PDF Download
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| Author | : Matthew Gregory Buchovecky |
| Publisher | : |
| Total Pages | : 231 |
| Release | : 2019 |
| Genre | : |
| ISBN | : |
Download Very High Energy Emission from the Galactic Center with VERITAS Book in PDF, ePub and Kindle
The Galactic Center (GC) is an extremely energetic region, host to a variety of powerful astronomical sources and rare astrophysical processes that emit a large flux of non-thermal radiation. The inner 375x600 pc region, called the Central Molecular Zone (CMZ), is home to the supermassive black hole Sgr A*, massive cloud complexes, supernova remnants, and likely the peak concentration of dark matter in the Galaxy. It has been studied across an extremely wide range of wavelengths by many instruments. In this dissertation, I present the results of my analysis of the very high-energy (VHE) (E > 100 GeV) gamma-ray emission from the GC using data from about 155 hours of quality observations taken with the VERITAS imaging atmospheric Cherenkov telescope. This emission includes a strong central point source VER J1745-290, coincident with the position of Sgr A*, and diffuse emission that extends along the Galactic ridge. VER J1745-290 is detected at a significance of 38 sigma, and I reconstruct its spectrum and lightcurve. Its spectrum is best fit by a power law with an index of -2.16 +/- 0.18 and flux normalization of (11.76 +/- 2.03)e-12 TeV/cm2/s at 1 TeV, and an exponential cutoff at 10.8 +/- 3.0 TeV. The exponential cutoff in its spectral shape, along with its apparent lack of variability in the very-high-energy gamma ray range favor electron models of its emission, such as the plerion model of emission from the pulsar wind nebula G359.95--0.04. I also present the results of my analysis on the morphology and, for the first time with VERITAS, the spectrum of diffuse emission in the GC. I find an approximately 52\% correlation of the gamma signal to molecular gas as traced by CS(1-0) line emission. I report an energy spectrum that is best fit by a pure power law with a hard index of -2.26 +/- 0.13, showing no evidence of a cutoff over 40 TeV. This strengthens the evidence of a potential accelerator of PeV cosmic rays being present in the GC. Using these results, I discuss the impact on current models of diffuse emission and possible connections to the central source. I also provide detections and spectra of other sources within the field of view of VERITAS.
| Author | : The Cta Consortium |
| Publisher | : World Scientific |
| Total Pages | : 365 |
| Release | : 2018-12-31 |
| Genre | : Science |
| ISBN | : 9813270101 |
Download Science With The Cherenkov Telescope Array Book in PDF, ePub and Kindle
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 | : Maurice M Shapiro |
| Publisher | : World Scientific |
| Total Pages | : 239 |
| Release | : 2007-11-22 |
| Genre | : Science |
| ISBN | : 9814472093 |
Download Astrophysics At Ultra-high Energies - Proceedings Of The 15th Course Of The International School Of Cosmic Ray Astrophysics Book in PDF, ePub and Kindle
This book introduces young researchers to the exciting field of ultra-high energy astrophysics including charged particles, gamma rays and neutrinos. At ultra-high energy the radiation is produced by interactions of cosmic ray particles accelerated in explosive events such as supernovae or hypernovae, black holes or, possibly, the big bang. Through direct contact with senior scientists, now actively planning the next generation of experiments/models, the excitement and motivation for research at ultra-high energy was conveyed. The underpinning of these fields is a synthesis of knowledge and techniques from nuclear and particle physics, astronomy and cosmology. Informing the participants of this background, how it was derived, and the new challenges for the future are the major goal. Further, the course has helped to foster new astrophysical research and promoted contacts, which have resulted in new collaborations.
| Author | : Denis Bastieri |
| Publisher | : American Institute of Physics |
| Total Pages | : 260 |
| Release | : 2009-05-15 |
| Genre | : Science |
| ISBN | : |
Download Science with the New Generation of High Energy Gamma-Ray Experiments Book in PDF, ePub and Kindle
This is the sixth edition in a series of Workshops on High Energy Gamma-Ray Experiments, following the ones held in Perugia (2002), Bari (2004), Cividale del Friuli (2005), Elba Island (2006) and Villa Mondragone (2007). The year the focus is on the region known by the acronym VHE (Very High Energy), bridging the gap between GeV and TeV. The physics that lies in this region is of the utmost importance to improve our knowledge of many different astrophysical sources like pulsars, AGNs, GRBs, and our understanding of the main components of the Extragalactic Background Light (EBL). An update is given on the current and planned research for spaceborne and ground-based experiments dedicated to the observation of the gamma-ray sky.
| Author | : Alessandro De Angelis |
| Publisher | : World Scientific |
| Total Pages | : 230 |
| Release | : 2006 |
| Genre | : Science |
| ISBN | : 9812773541 |
Download Proceedings of the Third Workshop on Science with the New Generation of High Energy Gamma-ray Experiments Book in PDF, ePub and Kindle
Introduction -- I. Detectors for high-energy gamma-rays. First results from the MAGIC experiment / D. Bastieri for the MAGIC collaboration. H.E.S.S. / P. Vincent for the H.E.S.S. collaboration. CANGAROO / M. Mori for the CANGAROO-II, III Team. The status of VERITAS / M.K. Daniel on behalf of the VERITAS collaboration. Gamma ray bursts: recent results obtained by the SWIFT mission / G. Chinearini on behalf of the SWIFT team. Functional tests and performance characterization during the assembly phase of the modules of the AGILE silicon tracker / M. Basset [und weitere]. Status of GLAST, the gamma-ray large-area space telescope / L. Rochester on behalf of the GLAST team. Status of the ARGO-YBJ experiment / P. Camarri for the ARGO-YBJ collaboration. Gamma Air Watch (GAW) - an imaging atmospheric Cherenkov telescope large with large field of view / T. Mineo [und weitere] -- II. Topics in fundamental physics. Frontiers of high energy cosmic rays / M. Pimenta. Measurement of cosmological parameters / A. Balbi. The present and the future of cosmology with gamma ray bursts / G. Ghirlanda, G. Ghisellini. Supersymmetry breaking, extra dimensions and neutralino dark matter / A.M. Lionetto. Dark matter at [symbol]-rays / L. Pieri. Populations of subhalos in cold dark matter halos / E. Bisesi -- III. Multiwavelength observations. WEBT multifrequency support to space observations / C.M. Raiteri and M. Villata for the WEBT collaboration. REM - The Remote Observatory for GRB et al. / E. Molinari on behalf of the REM/ROSS team. Planck-LFI: operation of the scientific ground segment / F. Pasian [und weitere]. INTEGRAL three years later / L. Foschini, G. Di Cocco, G. Malaguti. XMM observations of Geminga, PSR B1055-52 and PSR B0656+14: phase resolved spectroscopy as a tool to investigate the X-[symbol] connection / P.A. Caraveo [und weitere] -- IV. Poster session. Software time-calibration of the ARGO-YBJ detector / A.K. Calabrese Melcarne for the ARGO-YBJ collaboration. Gamma-ray burst physics with GLAST / N. Omodei. Observations of blazars and EGRET sources with INTEGRAL / V. Vitale [und weitere]. A third level trigger programmable on FPGA for the gamma/hadron separation in a Cherenkov telescope using Pseudo-Zernike moments and the SVM classifier / M. Frailis [und weitere]. PulsarSpectrum: simulating gamma-ray pulsars for the GLAST mission / M. Razzano [und weitere]
| Author | : Felix Aharonian |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 369 |
| Release | : 2013-04-04 |
| Genre | : Science |
| ISBN | : 364236134X |
Download Astrophysics at Very High Energies Book in PDF, ePub and Kindle
With the success of Cherenkov Astronomy and more recently with the launch of NASA’s Fermi mission, very-high-energy astrophysics has undergone a revolution in the last years. This book provides three comprehensive and up-to-date reviews of the recent advances in gamma-ray astrophysics and of multi-messenger astronomy. Felix Aharonian and Charles Dermer address our current knowledge on the sources of GeV and TeV photons, gleaned from the precise measurements made by the new instrumentation. Lars Bergström presents the challenges and prospects of astro-particle physics with a particular emphasis on the detection of dark matter candidates. The topics covered by the 40th Saas-Fee Course present the capabilities of current instrumentation and the physics at play in sources of very-high-energy radiation to students and researchers alike. This book will encourage and prepare readers for using space and ground-based gamma-ray observatories, as well as neutrino and other multi-messenger detectors.
| Author | : |
| Publisher | : |
| Total Pages | : 28 |
| Release | : 2015 |
| Genre | : |
| ISBN | : |
Download The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts Book in PDF, ePub and Kindle
It has been proposed that a recent outburst of cosmic-ray electrons could account for the excess of GeV-scale gamma rays observed from the region surrounding the Galactic Center. After studying this possibility in some detail, we identify scenarios in which a series of leptonic cosmic-ray outbursts could plausibly generate the observed excess. The morphology of the emission observed outside of ~1° - 2° from the Galactic Center can be accommodated with two outbursts, one which took place approximately ~106 years ago, and another (injecting only about 10% as much energy as the first) about ~105 years ago. The emission observed from the innermost ~1° - 2° requires one or more additional recent outbursts and/or a contribution from a centrally concentrated population of unresolved millisecond pulsars. Furthermore, in order to produce a spectrum that is compatible with the measured excess (whose shape is approximately uniform over the region of the excess), the electrons from the older outburst must be injected with significantly greater average energy than those injected more recently, enabling their spectra to be similar after ~106 years of energy losses.
| Author | : Andrea Albert |
| Publisher | : Morgan & Claypool Publishers |
| Total Pages | : 64 |
| Release | : 2016-09-06 |
| Genre | : Science |
| ISBN | : 1681742691 |
Download Searching for Dark Matter with Cosmic Gamma Rays Book in PDF, ePub and Kindle
Searching for Dark Matter with Cosmic Gamma Rays summarizes the evidence for dark matter and what we can learn about its particle nature using cosmic gamma rays. It has almost been 100 years since Fritz Zwicky first detected hints that most of the matter in the Universe that doesn't directly emit or reflect light. Since then, the observational evidence for dark matter has continued to grow. Dark matter may be a new kind of particle that is governed by physics beyond our Standard Model of particle physics. In many models, dark matter annihilation or decay produces gamma rays. There are a variety of instruments observing the gamma-ray sky from tens of MeV to hundreds of TeV. Some make deep, focused observations of small regions, while others provide coverage of the entire sky. Each experiment offers complementary sensitivity to dark matter searches in a variety of target sizes, locations, and dark matter mass scales. We review results from recent gamma-ray experiments including anomalies some have attributed to dark matter. We also discuss how our gamma-ray observations complement other dark matter searches and the prospects for future experiments.
| Author | : Yannick Giraud-Héraud |
| Publisher | : Atlantica Séguier Frontières |
| Total Pages | : 488 |
| Release | : 1997 |
| Genre | : Electroweak interactions |
| ISBN | : 9782863322178 |
Download Very High Energy Phenomena in the Universe Book in PDF, ePub and Kindle
| Author | : Cosimo Bambi |
| Publisher | : Springer Nature |
| Total Pages | : 5912 |
| Release | : |
| Genre | : |
| ISBN | : 9811969604 |
Download Handbook of X-ray and Gamma-ray Astrophysics Book in PDF, ePub and Kindle
