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Showing 1 to 12 of 12 for “"Crab Nebula"”.
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Photon reconstruction for the H.E.S.S. 28 m telescope and analysis of Crab Nebula and galactic centre observations
… known to emit γ-rays. The first of these is the Crab Nebula, the standard candle of ground-based γ-ray astronomy. The results of this source confirm the expected performance of the reconstruction method, where the much lower energy threshold compared to H.E.S.S. I is of particular importance. A …
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HEFT measurement of the hard X-ray size of the Crab Nebula and the hard X-ray optics of the Nuclear Spectroscopic Telescope Array (NuSTAR)
… I attempt to measuring the size of the Crab Nebula in this energy band. Analysis for aspect reconstruction, optical axis determination and the size measurement are described in detail. The size of the Crab Nebula is energy dependent due to synchrotron burn-off. The measurement of the …
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Pulsar wind nebulae at high energies
Pulsar wind nebulae (PWNe) are the most abundant TeV gamma-ray emitters in the Milky Way. The radiative emission of these objects is powered by fast-rotating pulsars, which donate parts of their rotational energy into winds of relativistic particles. This thesis presents an in-depth study of the …
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Crab flare observations with H.E.S.S. phase II
… found so far, even the oldest detection, the Crab Nebula, keeps surprising the scientific community with unexplained phenomena such as the recently discovered very energetic flares of high energy gamma-ray radiation. During its most recent flare, which was detected by the Fermi satellite in …
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Examining celestial polarization with the Gamma Ray Polarimeter Experiment (GRAPE)
… sources from 50 keV to 500 keV, and presents the Crab observation results from the successful 2011 balloon campaign. The successful balloon flight of this instrument took place on September 23rd and 24th, at Fort Sumner, New Mexico (Flight N624). The instrument was at float altitude for twenty-six …
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Gamma ray astronomy in the low energy range
… Texas in 1974. Gamma rays were observed from the Crab Nebula, the pulsar NP0 532, and the atmospheric background. No evidence for a gamma ray burst was found, giving an upper limit of less than 5.8 x 10<sup>3</sup> bursts per year of intensity greater than 1.6 x 10<sup>-6</sup> ergs …
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Analysis of variable VHE gamma-ray emission from the hard spectrum blazar 1ES 1218+304
… objects. Initially, the tools are applied to the Crab nebula data to optimize and calibrate the analysis. Afterwards, the analysis is applied to the high energy observations of the blazar 1ES 1218+304. We report an intense, day-scale flare observed on January 30, 2009. This marks the first …
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A new population of very high-energy gamma-ray sources detected with H.E.S.S. in the inner part of the Milky Way
… an average flux sensitivity of 3% of the Crab nebula at energies above 200 GeV. Fourteen new sources were detected at a significance level greater than 4 sigma in addition to three previously known sources in this area. Detailed spectral and morphological information for these new sources …
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Collecting heat during the day, observing the sky at night : the use of a heliostat field near Almeria to search for cosmic gamma rays
… detector on 18 different sources, among them the Crab nebula, the blazar Markarian 421 and the gamma-ray burst GRB010222. Evidence for a gamma-ray flux from the direction of the Crab pulsar and Markarian 421 was found, proving the feasibility of solar arrays for the observation of gamma-ray …
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GAMMA-RAY IMAGING OBSERVATIONS OF THE CRAB AND CYGNUS REGIONS
… were obtained, including observations of the Crab and Cygnus regions.</p><p>The Crab Nebula/pulsar was observed to have a featureless power-law spectrum with a best fit form of $5.1 \times 10\sp{-3} {\rm E\sb{MeV}}\sp{-1.88}$ photons ${\rm cm\sp{-2}\ s\sp{-1}\ MeV}\sp{-1},$ consistent with …