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Title:
A connection between star formation activity and cosmic rays in the starburst galaxy M82
Authors:
VERITAS Collaboration; Acciari, V. A.; Aliu, E.; Arlen, T.; Aune, T.; Bautista, M.; Beilicke, M.; Benbow, W.; Boltuch, D.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Byrum, K.; Cannon, A.; Celik, O.; Cesarini, A.; Chow, Y. C.; Ciupik, L.; Cogan, P.; Colin, P.; Cui, W.; Dickherber, R.; Duke, C.; Fegan, S. J.; Finley, J. P.; Finnegan, G.; Fortin, P.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Gibbs, K.; Gillanders, G. H.; Godambe, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Horan, D.; Hui, C. M.; Humensky, T. B.; Imran, A.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Kildea, J.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Lebohec, S.; Maier, G.; McArthur, S.; McCann, A.; McCutcheon, M.; Millis, J.; Moriarty, P.; Mukherjee, R.; Nagai, T.; Ong, R. A.; Otte, A. N.; Pandel, D.; Perkins, J. S.; Pizlo, F.; Pohl, M.; Quinn, J.; Ragan, K.; Reyes, L. C.; Reynolds, P. T.; Roache, E.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Smith, A. W.; Steele, D.; Swordy, S. P.; Theiling, M.; Thibadeau, S.; Varlotta, A.; Vassiliev, V. V.; Vincent, S.; Wagner, R. G.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; Weisgarber, T.; Williams, D. A.; Wissel, S.; Wood, M.; Zitzer, B.
Affiliation:
AA(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.; Department of Life and Physical Sciences, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland.), AB(Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, Delaware 19716, USA.), AC(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), AD(Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, California 95064, USA.), AE(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), AF(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), AG(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), AH(Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, Delaware 19716, USA.), AI(School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.), AJ(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), AK(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), AL(Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.), AM(School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.), AN(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), AO(School of Physics, National University of Ireland, Galway, Ireland.), AP(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), AQ(Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, Illinois 60605, USA.), AR(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), AS(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), AT(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), AU(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), AV(Department of Physics, Grinnell College, Grinnell, Iowa 50112-1690, USA.), AW(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), AX(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), AY(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), AZ(Department of Physics and Astronomy, Barnard College, Columbia University, New York, New York 10027, USA.), BA(Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, Illinois 60605, USA.), BB(Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, California 95064, USA.), BC(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), BD(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), BE(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), BF(School of Physics, National University of Ireland, Galway, Ireland.), BG(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), BH(School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.), BI(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), BJ(Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, Illinois 60605, USA.), BK(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), BL(Department of Physics and Astronomy and the Bartol Research Institute, University of Delaware, Newark, Delaware 19716, USA.), BM(Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France.), BN(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), BO(Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.), BP(Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.), BQ(Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, Iowa 52242, USA.), BR(Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, Illinois 60605, USA.), BS(Department of Physics and Astronomy, DePauw University, Greencastle, Indiana 46135-0037, USA.), BT(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), BU(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), BV(Department of Physics, Pittsburg State University, 1701 South Broadway, Pittsburg, Kansas 66762, USA.), BW(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), BX(Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.), BY(School of Physics, National University of Ireland, Galway, Ireland.), BZ(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), CA(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), CB(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), CC(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), CD(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), CE(Department of Physics, Anderson University, 1100 East 5th Street, Anderson, Indiana 46012, USA.), CF(Department of Life and Physical Sciences, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland.), CG(Department of Physics and Astronomy, Barnard College, Columbia University, New York, New York 10027, USA.), CH(Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.), CI(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), CJ(Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, California 95064, USA.), CK(Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, Iowa 52242, USA.), CL(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), CM(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), CN(Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.), CO(School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.), CP(Physics Department, McGill University, Montreal, Quebec H3A 2T8, Canada.), CQ(Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA.), CR(Department of Applied Physics and Instrumentation, Cork Institute of Technology, Bishopstown, Cork, Ireland.), CS(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), CT(School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.), CU(Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.), CV(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), CW(Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.), CX(Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, Illinois 60605, USA.), CY(Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.), CZ(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), DA(Department of Physics, Washington University, St Louis, Missouri 63130, USA.), DB(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.), DC(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), DD(Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA.), DE(Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.), DF(Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.), DG(School of Physics, University College Dublin, Belfield, Dublin 4, Ireland.), DH(Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, Arizona 85645, USA.), DI(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), DJ(Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.), DK(Santa Cruz Institute for Particle Physics and Department of Physics, University of California, Santa Cruz, California 95064, USA.), DL(Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA.), DM(Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.), DN(Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.)
Publication:
Nature, Volume 462, Issue 7274, pp. 770-772 (2009). (Nature Homepage)
Publication Date:
12/2009
Origin:
NATURE
Abstract Copyright:
(c) 2009: Nature
DOI:
10.1038/nature08557
Bibliographic Code:
2009Natur.462..770V

Abstract

Although Galactic cosmic rays (protons and nuclei) are widely believed to be mainly accelerated by the winds and supernovae of massive stars, definitive evidence of this origin remains elusive nearly a century after their discovery. The active regions of starburst galaxies have exceptionally high rates of star formation, and their large size-more than 50 times the diameter of similar Galactic regions-uniquely enables reliable calorimetric measurements of their potentially high cosmic-ray density. The cosmic rays produced in the formation, life and death of massive stars in these regions are expected to produce diffuse γ-ray emission through interactions with interstellar gas and radiation. M82, the prototype small starburst galaxy, is predicted to be the brightest starburst galaxy in terms of γ-ray emission. Here we report the detection of >700-GeV γ-rays from M82. From these data we determine a cosmic-ray density of 250eVcm-3 in the starburst core, which is about 500 times the average Galactic density. This links cosmic-ray acceleration to star formation activity, and suggests that supernovae and massive-star winds are the dominant accelerators.
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