Search For Light Primordial Black Holes With Veritas Using Gamma Ray And Optical Observations PDF Download
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| Author | : Konstantin Johannes Pfrang |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2023* |
| Genre | : |
| ISBN | : |
Download Search for Light Primordial Black Holes with VERITAS Using Gamma Γ-ray and Optical Observations Book in PDF, ePub and Kindle
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is an array of four imaging atmospheric Cherenkov telescopes (IACTs). VERITAS is sensitive to very-high-energy gamma-rays in the range of 100 GeV to >30 TeV. Hypothesized primordial black holes (PBHs) are attractive targets for IACTs. If they exist, their potential cosmological impact reaches beyond the candidacy for constituents of dark matter. The sublunar mass window is the largest unconstrained range of PBH masses. This thesis aims to develop novel concepts searching for light PBHs with VERITAS. PBHs below the sublunar window lose mass due to Hawking radiation. They would evaporate at the end of their lifetime, leading to a short burst of gamma-rays. If PBHs formed at about 10^15 g, the evaporation would occur nowadays. Detecting these signals might not only confirm the existence of PBHs but also prove the theory of Hawking radiation. This thesis probes archival VERITAS data recorded between 2012 and 2021 for possible PBH signals. This work presents a new ...
| Author | : Simon Archambault |
| Publisher | : |
| Total Pages | : |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
Download Search for Very-high-energy Gamma-ray Emission from Primordial Black Holes with Veritas Book in PDF, ePub and Kindle
"Primordial black holes are black holes that may have formed from density fluctuations in the early universe. It has been theorized that black holes slowly evaporate. If primordial black holes of initial mass 10^14g (or 10^−20 times the mass of the Sun) were formed, their evaporation would end in this epoch, in a bright burst of very-high-energy gamma rays. A Cherenkov telescope experiment like VERITAS can then look for these primordial black hole bursts in its data, in the hopes of constraining the rate-density of their final evaporation. This work describes the search for such black holes, using the VERITAS telescopes, as well as developing new techniques in order to reach better limits. The 99% C.L. upper limits obtained in this work are of 2.22 × 10^4 pc^−3 yr^−1, an improvement from previous VERITAS limits by a factor of 6, as well as from limits measured by other experiments." --
| Author | : A.J. Barger |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 310 |
| Release | : 2013-11-09 |
| Genre | : Science |
| ISBN | : 1402024711 |
Download Supermassive Black Holes in the Distant Universe Book in PDF, ePub and Kindle
Quasars, and the menagerie of other galaxies with "unusual nuclei", now collectively known as Active Galactic Nuclei or AGN, have, in one form or another, sparked the interest of astronomers for over 60 years. The only known mechanism that can explain the staggering amounts of energy emitted by the innermost regions of these systems is gravitational energy release by matter falling towards a supermassive black hole --- a black hole whose mass is millions to billions of times the mass of our Sun. AGN emit radiation at all wavelengths. X-rays originating at a distance of a few times the event horizon of the black hole are the emissions closest to the black hole that we can detect; thus, X-rays directly reveal the presence of active supermassive black holes. Oftentimes, however, the supermassive black holes that lie at the centers of AGN are cocooned in gas and dust that absorb the emitted low energy X-rays and the optical and ultraviolet light, hiding the black hole from view at these wavelengths. Until recently, this low-energy absorption presented a major obstacle in observational efforts to map the accretion history of the universe. In 1999 and 2000, the launches of the Chandra and XMM-Newton X-ray Observatories finally broke the impasse. The impact of these observatories on X-ray astronomy is similar to the impact that the Hubble Space Telescope had on optical astronomy. The astounding new data from these observatories have enabled astronomers to make enormous advances in their understanding of when accretion occurs.
| Author | : Mitchell Begelman |
| Publisher | : Cambridge University Press |
| Total Pages | : 333 |
| Release | : 2020-11-05 |
| Genre | : Science |
| ISBN | : 1108874770 |
Download Gravity's Fatal Attraction Book in PDF, ePub and Kindle
Richly illustrated with the images from observatories on the ground and in space, and computer simulations, this book shows how black holes were discovered, and discusses what we've learned about their nature and their role in cosmic evolution. This thoroughly updated third edition covers new discoveries made in the past decade, including the discovery of gravitational waves from merging black holes and neutron stars, the first close-up images of the region near a black hole event horizon, and observations of debris from stars torn apart when they ventured too close to a supermassive black hole. Avoiding mathematics, the authors blend theoretical arguments with observational results to demonstrate how both have contributed to the subject. Clear, explanatory illustrations and photographs reveal the strange and amazing workings of our universe. The engaging style makes this book suitable for introductory undergraduate courses, amateur astronomers, and all readers interested in astronomy and physics.
| Author | : Charles D. Dermer |
| Publisher | : Princeton University Press |
| Total Pages | : 568 |
| Release | : 2009-09-21 |
| Genre | : Science |
| ISBN | : 1400831490 |
Download High Energy Radiation from Black Holes Book in PDF, ePub and Kindle
Bright gamma-ray flares observed from sources far beyond our Milky Way Galaxy are best explained if enormous amounts of energy are liberated by black holes. The highest- energy particles in nature--the ultra-high-energy cosmic rays--cannot be confined by the Milky Way's magnetic field, and must originate from sources outside our Galaxy. Understanding these energetic radiations requires an extensive theoretical framework involving the radiation physics and strong-field gravity of black holes. In High Energy Radiation from Black Holes, Charles Dermer and Govind Menon present a systematic exposition of black-hole astrophysics and general relativity in order to understand how gamma rays, cosmic rays, and neutrinos are produced by black holes. Beginning with Einstein's special and general theories of relativity, the authors give a detailed mathematical description of fundamental astrophysical radiation processes, including Compton scattering of electrons and photons, synchrotron radiation of particles in magnetic fields, photohadronic interactions of cosmic rays with photons, gamma-ray attenuation, Fermi acceleration, and the Blandford-Znajek mechanism for energy extraction from rotating black holes. The book provides a basis for graduate students and researchers in the field to interpret the latest results from high-energy observatories, and helps resolve whether energy released by rotating black holes powers the highest-energy radiations in nature. The wide range of detail will make High Energy Radiation from Black Holes a standard reference for black-hole research.
| Author | : Hans A Bethe |
| Publisher | : World Scientific |
| Total Pages | : 520 |
| Release | : 2003-03-04 |
| Genre | : Science |
| ISBN | : 9814487139 |
Download Formation And Evolution Of Black Holes In The Galaxy: Selected Papers With Commentary Book in PDF, ePub and Kindle
In published papers H A Bethe and G E Brown worked out the collapse of large stars and supernova explosions. They went on to evolve binaries of compact stars, finding that in the standard scenario the first formed neutron star always went into a black hole in common envelope evolution. C-H Lee joined them in the study of black hole binaries and gamma ray bursts. They found the black holes to be the fossils of the gamma ray bursts. From their properties they could reconstruct features of the burst and of the accompanying hypernova explosions.This invaluable book contains 23 papers on astrophysics, chiefly on compact objects, written over 23 years. The papers are accompanied by illuminating commentary. In addition there is an appendix on kaon condensation which the editors believe to be relevant to the equation of state in neutron stars, and to explain why black holes are formed at relatively low masses.
| Author | : Thomas J. Maccarone |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 276 |
| Release | : 2007-01-28 |
| Genre | : Science |
| ISBN | : 1402040857 |
Download From X-ray Binaries to Quasars: Black Holes on All Mass Scales Book in PDF, ePub and Kindle
This volume brings together contributions from many of the world's leading authorities on black hole accretion. The papers within represent part of a new movement to make use of the relative advantages of studying stellar mass and supermassive black holes, and to bring together the knowledge gained from the two approaches. The topics discussed include black hole observational and theoretical work-variability, spectroscopy, disk-jet connections, and multi-wavelength campaigns on black holes.
| Author | : Manuel Arca Sedda |
| Publisher | : Elsevier |
| Total Pages | : 510 |
| Release | : 2024-06-03 |
| Genre | : Science |
| ISBN | : 0323956378 |
Download Black Holes in the Era of Gravitational-Wave Astronomy Book in PDF, ePub and Kindle
Black Holes in the Era of Gravitational-Wave Astronomy provides a multidisciplinary, up-to-date view of the physics of black holes, along with an exhaustive overview of crucial open questions and recent advancements in the astrophysics of black holes in the wake of incredible advancements made in the last decade. It includes discussions on improvements in theoretical modeling and observational perspectives for black holes of all sizes, along with associated challenges. The book's structure and themes will enable an entwined understanding of black hole physics at all scales, thus avoiding the compartmentalized view that is typical of more specialized manuscripts and reviews.This book is a complete reference for scientists interested in a multidirectional approach to the study of black holes. It provides substantial discussions about the interplay of different types of black holes and gives professionals a heterogeneous and comprehensive overview of the astrophysics of black holes of all masses. Focuses on recent advances and future perspectives surrounding black holes, providing researchers with a clear view of cutting-edge research Offers readers a multidisciplinary, fresh view on black holes, discussing and reviewing the most recent advancements in theoretical, numerical and observational techniques put in place to detect black holes Provides a bridge among different black hole areas, fostering new collaborations among professionals working in different, but intrinsically interconnected fields
| Author | : Sandip K. Chakrabarti |
| Publisher | : American Institute of Physics |
| Total Pages | : 438 |
| Release | : 2008-10-16 |
| Genre | : Science |
| ISBN | : |
Download Observational Evidence for Black Holes in the Universe Book in PDF, ePub and Kindle
The main objective of the conference was to focus on whether we have enough evidence for existence of black holes, starting from primordial to galactic, extragalactic. Experts from various communities such as, quasars of several billion solar mass to nano quasars of a few solar mass, presented their views and were unanimous that matter has been found to disappear behind event horizons and that the “standard” view of accretion requires major changes to understand the observations. These proceedings contains the most recent results on black hole astrophysics and astronomy, the multiwavelength satellite observations and on future space missions. Recent findings on the relationship among the compact sources and Gamma-ray bursts have been presented.
| Author | : Harry L. Shipman |
| Publisher | : |
| Total Pages | : 356 |
| Release | : 1980 |
| Genre | : Science |
| ISBN | : 9780395284995 |
Download Black Holes, Quasars, and the Universe Book in PDF, ePub and Kindle
Discusses recent developments in astronomy and new theories about the universe, emphasizing discoveries about black holes, quasars, and pulsars.
