OBSERVATION OF EXTENDED VERY HIGH ENERGY EMISSION FROM THE SUPERNOVA REMNANT IC 443 WITH VERITAS

V. A. Acciari(Center for Astrophysics Harvard & Smithsonian), E. Aliu(University of Delaware), T. Arlen(University of California, Los Angeles), T. Aune(University of California, Santa Cruz), M. A. Bautista(McGill University), M. Beilicke(Washington University in St. Louis), W. Benbow(Center for Astrophysics Harvard & Smithsonian), S. M. Bradbury(University of Leeds), J. H. Buckley(Washington University in St. Louis), V. Bugaev(Washington University in St. Louis), Y. Butt(Center for Astrophysics Harvard & Smithsonian), K. Byrum(Argonne National Laboratory), A. Cannon(University College Dublin), Ö. Çelik(University of California, Los Angeles), A. Cesarini(Ollscoil na Gaillimhe – University of Galway), Y. C. Chow(University of California, Los Angeles), L. Ciupik(Adler Planetarium), P. Cogan(McGill University), P. Colin(University of Utah), Wei Cui(Purdue University West Lafayette), M. K. Daniel(University of Leeds), R. Dickherber(Washington University in St. Louis), C. Duke(Grinnell College), Vikram V. Dwarkadas(University of Chicago), T. Ergin(Center for Astrophysics Harvard & Smithsonian), S. Fegan(University of California, Los Angeles), J. P. Finley(Purdue University West Lafayette), G. Finnegan(University of Utah), P. Fortin(Barnard College), L. Fortson(Adler Planetarium), A. Furniss(University of California, Santa Cruz), D. Gall(Purdue University West Lafayette), K. Gibbs(Center for Astrophysics Harvard & Smithsonian), G. H. Gillanders(Ollscoil na Gaillimhe – University of Galway), S. Godambe(University of Utah), J. Grube(University College Dublin), R. Guénette(McGill University), G. Gyuk(Adler Planetarium), D. Hanna(McGill University), E. Hays(Goddard Space Flight Center), J. Holder(University of Delaware), D. Horan(École Polytechnique), C. M. Hui(University of Utah), T. B. Humensky(Fermi National Accelerator Laboratory), Asif Imran(Iowa State University), P. Kaaret(University of Iowa), N. Karlsson(Adler Planetarium), M. Kertzman(DePauw University), D. Kieda(University of Utah), J. Kildea(Center for Astrophysics Harvard & Smithsonian), A. Konopelko(Pittsburg State University), H. Krawczynski(Washington University in St. Louis), F. Krennrich(Iowa State University), M. J. Lang(Ollscoil na Gaillimhe – University of Galway), S. LeBohec(University of Utah), G. Maier(McGill University), A. McCann(McGill University), M. McCutcheon(McGill University), J. Millis(Anderson University - Indiana), P. Moriarty(Galway-Mayo Institute of Technology), R. A. Ong(University of California, Los Angeles), A. N. Otte(University of California, Santa Cruz), D. Pandel(University of Iowa), J. S. Perkins(Center for Astrophysics Harvard & Smithsonian), M. Pohl(Iowa State University), J. Quinn(University College Dublin), K. Ragan(McGill University), L. C. Reyes(University of Chicago), P. T. Reynolds(Munster Technological University), E. Roache(Center for Astrophysics Harvard & Smithsonian), H. J. Rose(University of Leeds), M. Schroedter(Iowa State University), G. H. Sembroski(Purdue University West Lafayette), A. W. Smith(Argonne National Laboratory), D. Steele(Adler Planetarium), S. P. Swordy(University of Chicago), M. Theiling(Center for Astrophysics Harvard & Smithsonian), J. A. Toner(Ollscoil na Gaillimhe – University of Galway), L. Valcarcel(McGill University), A. Varlotta(Purdue University West Lafayette), V. V. Vassiliev(University of California, Los Angeles), S. Vincent(University of Utah), R. G. Wagner(Argonne National Laboratory), S. P. Wakely(Fermi National Accelerator Laboratory), J. E. Ward(University College Dublin), T. C. Weekes(Center for Astrophysics Harvard & Smithsonian), A. J. Weinstein(University of California, Los Angeles), T. Weisgarber(University of Chicago), D. A. Williams(University of California, Santa Cruz), Stephanie Wissel(University of Chicago), M. Wood(University of California, Los Angeles), B. Zitzer(Purdue University West Lafayette)
The Astrophysical Journal
June 1, 2009
10.1088/0004-637x/698/2/l133
Cited by 152Open Access
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Abstract

We present evidence that the very high energy (VHE, E > 100 GeV) gamma-ray emission coincident with the supernova remnant IC 443 is extended. IC 443 contains one of the best studied sites of supernova remnant/molecular cloud interaction and the pulsar wind nebula CXOU J061705.3+222127, both of which are important targets for VHE observations. VERITAS observed IC 443 for 37.9 hr during 2007 and detected emission above 300 GeV with an excess of 247 events, resulting in a significance of 8.3 standard deviations ( ) before trials and 7.5 after trials in a point-source search. The emission is centered at 6 h 16 m 51 s +22 30 11 (J2000) 0. 03 stat 0. 08 sys , with an intrinsic extension of 0. 16 0. 03 stat 0. 04 sys . The VHE spectrum is well fit by a power law (dN/dE = N 0 (E/TeV) - ) with a photon index of 2.99 0.38 stat 0.3 sys and an integral flux above 300 GeV of (4.63 0.90 stat 0.93 sys ) 10 -12 cm -2 s -1 . These results are discussed in the context of existing models for gamma-ray production in IC 443.

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