Download or read book Observations of the Crab Nebula and Pulsar in the Optical and Gamma ray Bands with STACEE written by Pascal Fortin and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) is an atmospheric Cherenkov telescope that detects cosmic gamma-rays using the wavefront-sampling technique. STACEE uses the large mirror area of the National Solar Thermal Test Facility (NSTTF) to achieve an energy threshold below 200 GeV. This telescope was used to search for high-energy gamma-ray emission from the Crab Nebula and pulsar. A statistical excess of 4.07sigma in the number of on-source events compared to off-source events was detected in 15 hours of on-source observing time, corresponding to an integral flux above the energy threshold (Ethr = 185 +/- 35 GeV) of I(E> Ethr) = (2.5 +/- 0.6) x 10-10 photons cm -2 s-1. The observed flux is in agreement with the previous result obtained by STACEE-32 and consistent with the power law spectrum seen at higher energies. A special instrument was developed to make simultaneous observations of the Crab in the optical and gamma-ray bands. Pulsed emission was detected in the optical band, demonstrating the accuracy of the barycentering and epoch folding analysis tools. After barycentering the arrival times and calculating the rotational phases of gamma-ray events, no evidence for pulsed emission from the Crab pulsar was found. The upper limit on the pulsed fraction of the signal was 16.4% at the 99.9% confidence level. Unfortunately, neither the polar cap model, nor the outer gap model is excluded by this new upper limit."--

Download or read book Gamma ray Astrophysics with CACTUS and the Flux of the Crab Nebula written by Paulo Manuel João Afonso and published by . This book was released on 2006 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Energy Gamma ray Observations of the Crab Nebula and Pulsar with the Solar Tower Atmospheric Cherenkov Effect Experiment written by Scott Michael Oser and published by . This book was released on 2000 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for Very High Energy Gamma Rays from the Crab Pulsar nebula written by Almus Thomas Kenter and published by . This book was released on 1989 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for Gamma rays from the Crab Nebula Using a Digitized Spark Chamber written by Donald Avery Kniffen and published by . This book was released on 1969 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observation of Pulsed and Non pulsed Gamma Radiation from the Crab Nebula Near 1 MeV written by Duane Edward Gruber and published by . This book was released on 1974 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gamma ray Imaging of the Crab and Vela Regions with the UCR Double compton Telescope written by Abderrezak Sarmouk and published by . This book was released on 1994 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detection of High Energy Gamma Rays from the Crab Nebula Pulsar and Other Results of the First Balloon Flight of a New Type of Detector written by David Gilbert Koch and published by . This book was released on 1972 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Search for Very High Energy Gamma Rays from the Crab written by Mark Andrew Skinner and published by . This book was released on 1991 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Energy X ray Observations of the Crab Nebula and NPO532 written by Stanley Graham Ryckman and published by . This book was released on 1976 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observation of Pulsed Gamma Rays with Energies Greater Than 250 KeV from the Crab Nebula Pulsar NP 0532 written by and published by . This book was released on 1972 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book OSSE Observations of the Crab Pulsar written by and published by . This book was released on 1994 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present results of the Compton Gamma Ray Observatory OSSE observations of the Crab pulsar, made during MJD 48373-48406 (27 April 1991-30 May 1991) and MJD 48798-48804 (25 June 1992-1 July 1992). Pulsar light curves and spectra over the ~0.05 to 10 MeV range are presented. The arrival time of the gamma-ray peak and the radio peak agree to within 30 microsecs, which is better than the ~300 microsecs accuracy of the measurements. The overall pulse phase averaged spectrum in the 0.1-10 MeV range is well-fit by a power law of the form 0:05 x (E/0.13 MeV)(exp 1.99 plus or minus 0.03) photons sq cm s(exp -1). The outer-gap model (with gap parameter equal to 0.46) provided to us by Ho agrees with the data to better than 20%. The spectra of the bridge and second peak are slightly harder that the first peak as measured by the hardness ratio (~110-220 keV)/(~50-105 keV): P1 = 0.54 plus or minus 0.01, P2 = 0.63 plus or minus 0.01, bridge = 0.68 plus or minus 0.03. The phase of the two peaks in the light curve is constant over the 50-550 keV range to within the accuracy of the measurements (better than 0.02 in in phase).

Download or read book High Resolution Gamma ray Spectroscopy of the Crab written by Lyle Monroe Bartlett and published by . This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Quasars Pulsars Black Holes and HEAO s written by and published by . This book was released on 1974 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Observations of the Crab Pulsar in Gamma Rays Above 1 Teraelectronvolt written by Max Ludwig Ahnen and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interstellar Absorption of the Crab Nebula s Soft X ray Flux and the X ray Spectrum of the Crab Pulsar written by Philip L.- Coleman and published by . This book was released on 1971 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: