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Acciari, VA,Aliu, E,Arlen, T,Aune, T,Bautista, M,Beilicke, M,Benbow, W,Boltuch, D,Bradbury, SM,Buckley, JH,Bugaev, V,Butt, Y,Byrum, K,Cesarini, A,Ciupik, L,Cui, W,Dickherber, R,Duke, C,Finley, JP,Finnegan, G,Fortson, L,Furniss, A,Galante, N,Gall, D,Gillanders, GH,Godambe, S,Gotthelf, EV,Grube, J,Guenette, R,Gyuk, G,Hanna, D,Holder, J,Hui, CM,Humensky, TB,Imran, A,Kaaret, P,Karlsson, N,Kertzman, M,Kieda, D,Konopelko, A,Krawczynski, H,Krennrich, F,Lang, MJ,LeBohec, S,Maier, G,McArthur, S,McCann, A,McCutcheon, M,Moriarty, P,Muhkerjee, R,Ong, RA,Otte, AN,Pandel, D,Perkins, JS,Pohl, M,Quinn, J,Ragan, K,Reyes, LC,Reynolds, PT,Roache, E,Rose, HJ,Schroedter, M,Sembroski, GH,Senturk, GD,Slane, P,Smith, AW,Steele, D,Swordy, SP,Tesic, G,Theiling, M,Thibadeau, S,Vassiliev, VV,Vincent, S,Wakely, SP,Wa
2010
August
Astrophysical Journal Letters
DISCOVERY OF VERY HIGH ENERGY gamma-RAY EMISSION FROM THE SNR G54.1+0.3
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()
Optional Fields
gamma rays: general ISM: supernova remnants pulsars: individual (J1930+1852, J1928+1746) PULSAR WIND NEBULAE SUPERNOVA REMNANT G54.1+0.3 CRAB-NEBULA VERITAS TELESCOPE ASTRONOMY G0.9+0.1 CATALOG SEARCH
719
69
73
We report the discovery of very high energy (VHE) gamma-ray emission from the direction of the SNR G54.1+ 0.3 using the VERITAS ground-based gamma-ray observatory. The TeV signal has an overall significance of 6.8s and appears pointlike given the resolution of the instrument. The integral flux above 1 TeV is 2.5% of the Crab Nebula flux and significant emission is measured between 250 GeV and 4 TeV, well described by a power-law energy spectrum dN/dE similar to E-Gamma with a photon index Gamma = 2.39 +/- 0.23(stat) +/- 0.30sys. We find no evidence of time variability among observations spanning almost two years. Based on the location, the morphology, the measured spectrum, the lack of variability, and a comparison with similar systems previously detected in the TeV band, the most likely counterpart of this new VHE gamma-ray source is the pulsar wind nebula (PWN) in the SNR G54.1+0.3. The measured X-ray to VHE gamma-ray luminosity ratio is the lowest among all the nebulae supposedly driven by young rotation-powered pulsars, which could indicate a particle-dominated PWN.
DOI 10.1088/2041-8205/719/1/L69
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