Veritas observations of day-scale flaring of M 87 in 2010 April

Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Bradbury, S.M.; Buckley, J.H.; Bugaev, V.; Byrum, K.; Cannon, A.; Cesarini, A.; Ciupik, L.; Collins-Hughes, E.; Connolly, M.P.; Cui, W.; Dickherber, R.; Duke, C.; Errando, M.; Falcone, A.; Finley, J.P.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Godambe, S.; Griffin, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Huan, H.; Hughes, G.; Hui, C.M.; Humensky, T.B.; Imran, A.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Lang, M.J.; Lebohec, S.; Madhavan, A.S.; Maier, G.; Majumdar, P.; McArthur, S.; McCann, A.; Moriarty, P.; Mukherjee, R.; Nũez, P.D.; Ong, R.A.; Orr, M.; Otte, A.N.; Park, N.; Perkins, J.S.; Pichel, A.; Pohl, M.; Prokoph, H.; Quinn, J.; Ragan, K.; Reyes, L.C.; Reynolds, P.T.; Roache, E.; Rose, H.J.; Ruppel, J.; Saxon, D.B.; Schroedter, M.; Sembroski, G.H.; Entürk, G.D.; Skole, C.; Staszak, D.; Teić, G.; Theiling, M.; Thibadeau, S.; Tsurusaki, K.; Tyler, J.; Varlotta, A.; Vassiliev, V.V.; Vincent, S.; Vivier, M.; Wakely, S.P.; Ward, J.E.; Weekes, T.C.; Weinstein, A.; Weisgarber, T.; Williams, D.A.; Zitzer, B.

doi:10.1088/0004-637X/746/2/141

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Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Bradbury, S.M.; Buckley, J.H.; Bugaev, V.; Byrum, K.; Cannon, A.; Cesarini, A.; Ciupik, L.; Collins-Hughes, E.; Connolly, M.P.; Cui, W.; Dickherber, R.; Duke, C. (...) Zitzer, B. "Veritas observations of day-scale flaring of M 87 in 2010 April" (2012) Astrophysical Journal. 746(2)

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Abstract:

VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of the radio galaxy M 87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of (0.70 ± 0.16) × 10-11 cm-2 s-1 at energies above 350GeV. In 2010 April, VERITAS detected a flare from M 87 with peak flux of (2.71 ± 0.68) × 10-11 cm-2 s-1 for E > 350GeV. The source was observed for six consecutive nights during the flare, resulting in a total of 21 hr of good-quality data. The most rapid flux variation occurred on the trailing edge of the flare with an exponential flux decay time of 0.90+0.22 -0.15days. The shortest detected exponential rise time is three times as long, at 2.87 +1.65 -0.99days. The quality of the data sample is such that spectral analysis can be performed for three periods: rising flux, peak flux, and falling flux. The spectra obtained are consistent with power-law forms. The spectral index at the peak of the flare is equal to 2.19 ± 0.07. There is some indication that the spectrum is softer in the falling phase of the flare than the peak phase, with a confidence level corresponding to 3.6 standard deviations. We discuss the implications of these results for the acceleration and cooling rates of VHE electrons in M 87 and the constraints they provide on the physical size of the emitting region. © 2012. The American Astronomical Society. All rights reserved.

Registro:

Documento:	Artículo
Título:	Veritas observations of day-scale flaring of M 87 in 2010 April
Autor:	Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Bouvier, A.; Bradbury, S.M.; Buckley, J.H.; Bugaev, V.; Byrum, K.; Cannon, A.; Cesarini, A.; Ciupik, L.; Collins-Hughes, E.; Connolly, M.P.; Cui, W.; Dickherber, R.; Duke, C.; Errando, M.; Falcone, A.; Finley, J.P.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Godambe, S.; Griffin, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Huan, H.; Hughes, G.; Hui, C.M.; Humensky, T.B.; Imran, A.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Krawczynski, H.; Krennrich, F.; Lang, M.J.; Lebohec, S.; Madhavan, A.S.; Maier, G.; Majumdar, P.; McArthur, S.; McCann, A.; Moriarty, P.; Mukherjee, R.; Nũez, P.D.; Ong, R.A.; Orr, M.; Otte, A.N.; Park, N.; Perkins, J.S.; Pichel, A.; Pohl, M.; Prokoph, H.; Quinn, J.; Ragan, K.; Reyes, L.C.; Reynolds, P.T.; Roache, E.; Rose, H.J.; Ruppel, J.; Saxon, D.B.; Schroedter, M.; Sembroski, G.H.; Entürk, G.D.; Skole, C.; Staszak, D.; Teić, G.; Theiling, M.; Thibadeau, S.; Tsurusaki, K.; Tyler, J.; Varlotta, A.; Vassiliev, V.V.; Vincent, S.; Vivier, M.; Wakely, S.P.; Ward, J.E.; Weekes, T.C.; Weinstein, A.; Weisgarber, T.; Williams, D.A.; Zitzer, B.
Filiación:	Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027, United States Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, United States Santa Cruz Institute for Particle Physics, Department of Physics, University of California, Santa Cruz, CA 95064, United States Department of Physics, Washington University, St. Louis, MO 63130, United States Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645, United States School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, United States School of Physics, University College Dublin, Belfield, Dublin 4, Ireland School of Physics, National University of Ireland Galway, University Road, Galway, Ireland Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605, United States Department of Physics, Purdue University, West Lafayette, IN 47907, United States Department of Physics, Grinnell College, Grinnell, IA 50112-1690, United States Department of Astronomy and Astrophysics, 525 Davey Lab, Pennsylvania State University, University Park, PA 16802, United States Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112, United States School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, United States Department of Physics and Astronomy, University of Iowa, Van Allen Hall, Iowa City, IA 52242, United States Physics Department, McGill University, Montreal, QC H3A 2T8, Canada Department of Physics and Astronomy, Bartol Research Institute, University of Delaware, Newark, DE 19716, United States Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, United States DESY, Platanenallee 6, 15738 Zeuthen, Germany Physics Department, Columbia University, New York, NY 10027, United States Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States Department of Physics and Astronomy, DePauw University, Greencastle, IN 46135-0037, United States Department of Life and Physical Sciences, Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland School of Physics, Center for Relativistic Astrophysics, Georgia Institute of Technology, 837 State Street NW, Atlanta, GA 30332-0430, United States CRESST and Astroparticle Physics Laboratory NASA/GSFC, Greenbelt, MD 20771, United States University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States Instituto de Astronomia y Fisica Del Espacio, Casilla de Correo 67-Sucursal 28, C1428ZAA Ciudad Autónoma de Buenos Aires, Argentina Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam-Golm, Germany Physics Department, California Polytechnic State University, San Luis Obispo, CA 94307, United States Department of Applied Physics and Instrumentation, Cork Institute of Technology, Bishopstown, Cork, Ireland
Palabras clave:	gamma rays: galaxies
Año:	2012
Volumen:	746
Número:	2
DOI:	http://dx.doi.org/10.1088/0004-637X/746/2/141
Título revista:	Astrophysical Journal
Título revista abreviado:	Astrophys. J.
ISSN:	0004637X
Registro:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v746_n2_p_Aliu

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Citas:

---------- APA ----------

Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Bouvier, A., Bradbury, S.M.,..., Zitzer, B. (2012) . Veritas observations of day-scale flaring of M 87 in 2010 April. Astrophysical Journal, 746(2).
http://dx.doi.org/10.1088/0004-637X/746/2/141

---------- CHICAGO ----------

Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Bouvier, A., et al. "Veritas observations of day-scale flaring of M 87 in 2010 April" . Astrophysical Journal 746, no. 2 (2012).
http://dx.doi.org/10.1088/0004-637X/746/2/141

---------- MLA ----------

Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Bouvier, A., et al. "Veritas observations of day-scale flaring of M 87 in 2010 April" . Astrophysical Journal, vol. 746, no. 2, 2012.
http://dx.doi.org/10.1088/0004-637X/746/2/141

---------- VANCOUVER ----------

Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Bouvier, A., et al. Veritas observations of day-scale flaring of M 87 in 2010 April. Astrophys. J. 2012;746(2).
http://dx.doi.org/10.1088/0004-637X/746/2/141