Download or read book A Search for Fast Gamma Ray Pulsars with OSSE written by and published by . This book was released on 1995 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsar mode data from the Oriented Scintillation Spectrometer Experiment (OSSE) onboard the Compton Gamma Ray Observatory, with time resolution between 125 microsecond and 8 ms, have been analyzed for the presence of short period gamma-ray pulsations. Observations of known point sources (including SN 1987A, SN 1993J, GRO J0422+32, and several pulsars) and of regions where high densities of pulsars are expected (including the Galactic Center, the Galactic plane and arms, and the Large Magellanic Cloud) are included in the study. Both isolated pulsars and pulsars in close binary systems are searched for; in the latter case, the quadratic coherence recovery technique is used to correct for broadening of the pulsar signal from orbital motion. No new gamma-ray pulsars have been detected. Upper limits on the pulsed gamma-ray flux from isolated pulsars in the 50-210 keV energy range of OSSE are between 0:2 x 10(exp -3) and 2.0 x 10(exp -3) photons s(exp -1) for pulse periods between 250 microseconds and 0.5 s. Upper limits on the pulsed flux from binary pulsars are between 1.5 x 10(exp -3) and 6.4 x 10(exp -3) photons s(exp -1)/sq cm for the same energy band and pulse period range. We estimate that, in the Galaxy, there are fewer than ~125 isolate pulsars similar to PSR B1509-58 with radiation peaks in the OSSE band but undetected in the radio and X-ray bands.
Download or read book An OSSE Search for the Binary Radio Pulsar 1259 63 written by and published by . This book was released on 1993 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have searched data from the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory (GRO) for evidence of low-energy gamma-ray emission from the binary radio pulsar PSR 1259-63. This 47 ms pulsar is in a long-period, highly eccentric orbit around a Be stellar companion and was observed by OSSE approximately 400 days after periastron. The period derivative allowed by the published radio ephemeris (Johnston et al. 1992) suggests that the pulsar might be relatively young, and therefore a gamma-ray source. However, the ephemeris is not sufficiently accurate to allow the traditional epoch folding technique over the full OSSE observation. Instead, the OSSE data were analyzed using Fourier transform spectral techniques after applying trial accelerations to correct for a range of possible orbital accelerations. We searched 48 accelerations; each FFT was 2(exp 29) points sampled at 2 ms, spanning ~10(exp 6) seconds of observation time. There was no evidence of pulsed emission in the 64-150 keV band, with a 99.9% confidence upper limit of 6x10(exp -3) photons sq cm s(exp -1) MeV(exp -1) or ~40 m Crab pulsars, which suggests that the pulsar's intrinsic period derivative is small and its magnetic field weak. This work was performed on the Concurrent Supercomputing Consortium's Intel Touchstone Delta parallel supercomputer as part of a GRO Phase I Guest Investigation.
Download or read book Search for Ultrahigh energy Gamma Rays from Fast Pulsars written by Jui-Pin Wu and published by . This book was released on 1995 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for Medium Energy Gamma Ray Pulsars written by William Emmett Sweeney and published by . This book was released on 1987 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Second Compton Symposium written by N. Gehrels and published by American Inst. of Physics. This book was released on 1998-03-19 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Proceedings of a conference held in College Park, Maryland, in September 1993. Papers discuss results from the Compton Gamma Ray Observatory, in orbit since 1991. Presentations are divided into sections on opening remarks, spin-powered pulsars, nucleosynthesis, galactic sources, galactic center, cosmic rays and galactic diffusion radiation, agn-seyferts, agn-quasars and bl lacs, and analysis and instrumentation. No index. Annotation c. by Book News, Inc., Portland, Or.
Download or read book Revealing the Most Energetic Light from Pulsars and Their Nebulae written by David Carreto Fidalgo and published by Springer. This book was released on 2019-07-17 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the extraordinary observation of TeV gamma rays from the Crab Pulsar, the most energetic light ever detected from this type of object. It presents detailed information on the painstaking analysis of the unprecedentedly large dataset from the MAGIC telescopes, and comprehensively discusses the implications of pulsed TeV gamma rays for state-of-the-art pulsar emission models. Using these results, the book subsequently explores new testing methodologies for Lorentz Invariance Violation, in terms of a wavelength-dependent speed of light. The book also covers an updated search for Very-High-Energy (VHE), >100 GeV, emissions from millisecond pulsars using the Large Area Telescope on board the Fermi satellite, as well as a study on the promising Pulsar Wind Nebula candidate PSR J0631. The observation of VHE gamma rays is essential to studying the non-thermal sources of radiation in our Universe. Rotating neutron stars, also known as pulsars, are an extreme source class known to emit VHE gamma rays. However, to date only two pulsars have been detected with emissions above 100 GeV, and our understanding of their emission mechanism is still lacking.
Download or read book Very high energy Gamma ray Observations of Pulsar Wind Nebulae and Cataclysmic Variable Stars with MAGIC and Development of Trigger Systems for IACTs written by Rubén López Coto and published by Springer. This book was released on 2016-09-29 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is a comprehensive work that addresses many of the open questions currently being discusssed in the very-high-energy (VHE) gamma-ray community. It presents a detailed description of the MAGIC telescope together with a glimpse of the future Cherenkov Telescope Array (CTA). One section is devoted to the design, development and characterization of trigger systems for current and future imaging atmospheric Cherenkov telescopes. The book also features a state-of-the-art description of pulsar wind nebula (PWN) systems, the study of the multi-TeV spectrum of the Crab nebula, as well as the discovery of VHE gamma rays at the multiwavelength PWN 3C 58, which were sought at these wavelengths for more than twenty years. It also includes the contextualization of this discovery amongst the current population of VHE gamma-ray PWNe. Cataclysmic variable stars represent a new source of gamma ray energies, and are also addressed here. In closing, the thesis reports on the systematic search for VHE gamma-ray emissions of AE Aquarii in a multiwavelength context and the search for VHE gamma-ray variability of novae during outbursts at different wavelengths.
Download or read book Search for High Energy Gamma ray Pulsars in the EGRET Data Base written by Francois Pedro Squirra and published by . This book was released on 1998 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Blind search Survey for Gamma ray Pulsars written by Colin James Clark and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsars, gamma rays, astronomy. - Pulsare, Gammastrahlung, Astronomie
Download or read book Isolated Pulsars written by K. A. van Riper and published by Cambridge University Press. This book was released on 1993-03-25 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: The extreme properties of pulsars demand a broad range of physics. From The Los Alamos Workshop on Isolated Pulsars contributions have been selected to encompass all aspects of pulsar detection and understanding. Recent observational highlights include results from the Compton Gamma-Ray Observatory, ROSAT and GINGA and the Hubble Space Telescope. Well-illustrated theoretical contributions cover a wide range of topics. This volume forms a comprehensive and up-to-date guide to the observation and theory of solitary neutron stars.
Download or read book Finding Or Not New Gamma Ray Pulsars with GLAST written by and published by . This book was released on 2011 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Young energetic pulsars will likely be the largest class of Galactic sources observed by GLAST, with many hundreds detected. Many will be unknown as radio pulsars, making pulsation detection dependent on radio and/or x-ray observations or on blind periodicity searches of the gamma-rays. Estimates for the number of pulsars GLAST will detect in blind searches have ranged from tens to many hundreds. I argue that the number will be near the low end of this range, partly due to observations being made in a scanning as opposed to a pointing mode. This paper briefly reviews how blind pulsar searches will be conducted using GLAST, what limits these searches, and how the computations and statistics scale with various parameters.
Download or read book Pulsar Astronomy written by Andrew Lyne and published by Cambridge University Press. This book was released on 2022-08-04 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive introduction to pulsars and radio-emitting neutron stars, including observational and theoretical concepts and applications.
Download or read book Blind Searches for Radio quiet Gamma ray Pulsars with Fermi LAT written by Michael Harry Dormody and published by . This book was released on 2011 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Search for TeV Gamma ray Pulsars written by Andrew Mark Burdett and published by . This book was released on 2001 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray Bursts written by Cheng Ho and published by Cambridge University Press. This book was released on 1992-03-12 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarizes the current understanding of Astronomical gamma-ray bursts, short-lived flashes of high-energy radiation, which have eluded even a basic explanation for over twenty years, and describes directions for future research.
Download or read book High Energy Emission from Pulsars and their Systems written by Nanda Rea and published by Springer Science & Business Media. This book was released on 2011-02-04 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the inaugural meeting of the Sant Cugat Forum on Astrophysics was to address, in a global context, the current understanding of and challenges in high-energy emissions from isolated and non-isolated neutron stars, and to confront the theoretical picture with observations of both the Fermi satellite and the currently operating ground-based Cherenkov telescopes. Participants have also discussed the prospects for possible observations with planned instruments across the multi-wavelength spectrum (e.g. SKA, LOFAR, E-VLT, IXO, CTA) and how they will impact our theoretical understanding of these systems. In keeping with the goals of the Forum, this book not only represents the proceedings of the meeting, but also a reflection on the state-of-the-art in the topic.
Download or read book OSSE Observations of X Ray Pulsars written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on OSSE observations of the Be binary pulsars A0535+26, GRO J1008-57, and 4U 0115+63 at energies above 50 keV. The spectra are generally thermal, with exponential folding energies of 15-25 keV, and no evidence for hard power-law tails. We have clearly detected a strong cyclotron absorption line at 110 keV from A0535+26 [1], and we find a suggestion of an absorption line near 90 keV from GRO J1008-57.
