Bulletin of the American Physical Society
Fall 2009 Meeting of the Four Corners Section of the APS
Volume 54, Number 14
Friday–Saturday, October 23–24, 2009; Golden, Colorado
Session B1: Astroparticle Symposium I: VHE Gamma Rays 1 |
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Chair: David Kieda, University of Utah Room: Green Center 210N |
Friday, October 23, 2009 2:10PM - 2:34PM |
B1.00001: VERITAS observation of the E$>$200GeV gamma ray sky Stephan LeBohec VERITAS is an array of four 12-m diameter imaging atmospheric Cherekov telescopes located in southern Arizona. The array has been in full operation since Fall 2007 and is sensitive to very high energy gamma-rays above 100 GeV. VERITAS has been used to detect new sources of TeV emission, such as the blazars 1ES 0806+524, RGB J0710+591 and W Comae and to study many other source classes including supernova remnants, gamma-ray binaries and radio galaxies. We will present a review of recent VERITAS results. [Preview Abstract] |
Friday, October 23, 2009 2:34PM - 2:46PM |
B1.00002: Observations of SNR Cassiopeia A with VERITAS Brad Smith, Dongqing Huang, Alexander Konopelko We report on observations of very high-energy gamma rays from the shell-type supernova remnant Cassiopeia A with the VERITAS stereoscopic array of four imaging atmospheric Cerenkov telescopes in Arizona. The total exposure time for these observations accounts for 21 hrs. The gamma-ray source associated with the SNR Cassiopeia A was decisively resolved above 200 GeV with a high statistical significance. The estimated integral flux for this gamma-ray source is about 5{\%} of the Crab-Nebula flux. The photon spectrum is compatible with a power law. Along with a detailed description of the analysis results we present a short discussion of the physical mechanisms that may be responsible for the observed gamma-ray emission. [Preview Abstract] |
Friday, October 23, 2009 2:46PM - 2:58PM |
B1.00003: Search for VHE gamma-ray emission from SNR Gamma Cygni using VERITAS Matthew Shaw The nearby (d$\sim $1.8 kpc) F8 star Gamma Cygni is located in a shell-type Supernova remnant associated with the bright EGRET unidentified source 3EG J2020+4017. In 2009, we observed Gamma Cygni at TeV (10$^{12}$ eV) energies using VERITAS, an Imaging Atmospheric Cherenkov Telescope observatory located in southern Arizona. From observations made between May 24th and June 24th 2009, we selected 730 minutes of useable data for analysis. The data was analyzed using the standard GRISU package, with modifications to account for the optically bright star Gamma Cygni (V=+2.23). At the meeting I will present some initial results of this analysis. [Preview Abstract] |
Friday, October 23, 2009 2:58PM - 3:10PM |
B1.00004: Search for VHE gamma rays from ULIR Galaxy NGC 6240 Zephne Larsen NGC 6240 is an ultra luminous IR galaxy resulting from the merger of two smaller galaxies. Its extraordinary IR luminosity may be due to the presence of intense star forming regions and/or supermassive black holes. It was observed in the spring of 2009 for 1360 minutes using the VERITAS Very High Energy (VHE) gamma-ray telescope array in southern Arizona. The data have been analyzed with the GrISU analysis package, using standard cuts and the ring background estimation method. We find no significant excess of TeV gamma rays arriving from the direction of NGC 6240, allowing us to set an upper limit on the VHE gamma-ray emission from this source: Flux $<$ 1.37{\%} Crab (E $>$ 300 GeV). [Preview Abstract] |
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