Search for a Dark Matter Gamma-ray Signal from Dwarf Spheroidal Galaxies with CACTUS PDF Download

Author: Peter Anthony Marleau
Publisher:
ISBN:
Category :
Languages : en
Pages : 310

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Author: Miguel A. Sánchez-Conde
Publisher: MDPI
ISBN: 3039360442
Category : Mathematics
Languages : en
Pages : 220

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An important, open research topic today is to understand the relevance that dark matter halo substructure may have for dark matter searches. In the standard cosmological model, halo substructure or subhalos are predicted to be largely abundant inside larger halos, for example, galaxies such as ours, and are thought to form first and later merge to form larger structures. Dwarf satellite galaxies—the most massive exponents of halo substructure in our own galaxy—are already known to be excellent targets for dark matter searches, and indeed, they are constantly scrutinized by current gamma-ray experiments in the search for dark matter signals. Lighter subhalos not massive enough to have a visible counterpart of stars and gas may be good targets as well, given their typical abundances and distances. In addition, the clumpy distribution of subhalos residing in larger halos may boost the dark matter signals considerably. In an era in which gamma-ray experiments possess, for the first time, the exciting potential to put to test the preferred dark matter particle theories, a profound knowledge of dark matter astrophysical targets and scenarios is mandatory should we aim for accurate predictions of dark matter-induced fluxes for investing significant telescope observing time on selected targets and for deriving robust conclusions from our dark matter search efforts. In this regard, a precise characterization of the statistical and structural properties of subhalos becomes critical. In this Special Issue, we aim to summarize where we stand today on our knowledge of the different aspects of the dark matter halo substructure; to identify what are the remaining big questions, and how we could address these; and, by doing so, to find new avenues for research.

Author: Peter D. Barnes
Publisher: AIP Conference Proceedings / H
ISBN:
Category : Science
Languages : en
Pages : 1216

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This is the proceedings of the 17th International Conference on Particles and Nuclei, Santa Fe, New Mexico, USA which was concerned with new developments in experimental and theoretical particle physics, nuclear physics, and cosmology, and the intersections of these fields which will help us understand our Universe more completely. The participants reported on new developments in instrumentation, including large-scale facilities, such as accelerators, that will be essential for future work.

Author: Andrea Albert
Publisher: Morgan & Claypool Publishers
ISBN: 1681742705
Category : Science
Languages : en
Pages : 82

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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: Carlos Muñoz
Publisher:
ISBN: 9780735403796
Category : Science
Languages : en
Pages : 450

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The aim of this workshop was to bring the experts in the field of Astroparticle Physics and related topics (particle physics, astrophysics, and cosmology) to discuss on the latest theroetical and experimental advances. The topics of the workshop included: direct and indirect detection of dark matter, particle candidates for dark matter, supersymmetry, astrophysical analyses of galactic halos, dark energy, inflation, leptogenesis, neutrinos, axion-like particles, ultra high energy cosmic rays, gamma ray bursts, string landscape and anthropic reasoning.

Author: Jelena Aleksić
Publisher: Springer
ISBN: 3319231235
Category : Science
Languages : en
Pages : 213

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This thesis presents the results of indirect dark matter searches in the gamma-ray sky of the near Universe, as seen by the MAGIC Telescopes. The author has proposed and led the 160 hours long observations of the dwarf spheroidal galaxy Segue 1, which is the deepest survey of any such object by any Cherenkov telescope so far. Furthermore, she developed and completely characterized a new method, dubbed “Full Likelihood”, that optimizes the sensitivity of Cherenkov instruments for detection of gamma-ray signals of dark matter origin. Compared to the standard analysis techniques, this novel approach introduces a sensitivity improvement of a factor of two (i.e. it requires 4 times less observation time to achieve the same result). In addition, it allows a straightforward merger of results from different targets and/or detectors. By selecting the optimal observational target and combining its very deep exposure with the Full Likelihood analysis of the acquired data, the author has improved the existing MAGIC bounds to the dark matter properties by more than one order of magnitude. Furthermore, for particles more massive than a few hundred GeV, those are the strongest constraints from dwarf galaxies achieved by any gamma-ray instrument, both ground-based or space-borne alike.

Author: John L. Friedman
Publisher: Cambridge University Press
ISBN: 1107310601
Category : Science
Languages : en
Pages : 435

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The masses of neutron stars are limited by an instability to gravitational collapse and an instability driven by gravitational waves limits their spin. Their oscillations are relevant to x-ray observations of accreting binaries and to gravitational wave observations of neutron stars formed during the coalescence of double neutron-star systems. This volume includes more than forty years of research to provide graduate students and researchers in astrophysics, gravitational physics and astronomy with the first self-contained treatment of the structure, stability and oscillations of rotating neutron stars. This monograph treats the equations of stellar equilibrium; key approximations, including slow rotation and perturbations of spherical and rotating stars; stability theory and its applications, from convective stability to the r-mode instability; and numerical methods for computing equilibrium configurations and the nonlinear evolution of their oscillations. The presentation of fundamental equations, results and applications is accessible to readers who do not need the detailed derivations.

Author: T.C. Weekes
Publisher: CRC Press
ISBN: 1420033190
Category : Science
Languages : en
Pages : 234

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Book Description
High energy gamma-ray photons are the prime probes of the relativistic or high-energy universe, populated by black holes, neutron stars, supernovae, quasars, and matter-antimatter annihilations. Through studying the gamma-ray sky, astrophysicists are able to better understand the formation and behavior of these exotic and energetic bodies. V

Author: Stefano Profumo
Publisher: Wspc (Europe)
ISBN: 9781786340009
Category : Science
Languages : en
Pages : 270

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Book Description
Particle dark matter: the name of the game -- The thermal relic paradigm: zeroth-order lessons from cosmology -- The thermal relic paradigm: a closer look -- The art of WIMP direct detection -- Indirect dark matter searches -- Searching for dark matter with particle colliders -- Axions and axion-like particles as dark matter -- Sterile neutrinos as dark matter particles -- Bestiarium: a short, biased compendium of notable dark matter particle candidates and models

Author: Sociedad Española de Astronomía. Scientific Meeting
Publisher: Springer Science & Business Media
ISBN: 9780792369745
Category : Science
Languages : en
Pages : 442

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Book Description
This volume documents the contributions presented at the 4th Scientific Meeting of the Spanish Astronomical Society (SEA). Covering a wide range of topics, the 146 contributed papers give a comprehensive overview of the current state of Spanish astronomy. The Proceedings include special reviews dealing with the cosmological information obtained from galaxy spectra, supernovae at high redshift, black holes, dynamics of galaxy interactions, and non-LTE inversion of spectral lines. The contents of these Proceedings thus reflect the broad interests of the Spanish astronomical community. The symbolic significance of these proceedings can hardly be exaggerated, since here, for the second time, the SEA publishes the proceedings of its own scientific meeting. This book is recommended to professional astronomers and astronomy graduate students worldwide.