Veritas observations of day-scale flaring of M 87 in 2010 April
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 d...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_0004637X_v746_n2_p_Aliu |
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todo:paper_0004637X_v746_n2_p_Aliu2023-10-03T14:02:18Z 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. gamma rays: galaxies 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v746_n2_p_Aliu |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
gamma rays: galaxies |
| spellingShingle |
gamma rays: galaxies 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. Veritas observations of day-scale flaring of M 87 in 2010 April |
| topic_facet |
gamma rays: galaxies |
| description |
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. |
| format |
JOUR |
| author |
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. |
| author_facet |
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. |
| author_sort |
Aliu, E. |
| title |
Veritas observations of day-scale flaring of M 87 in 2010 April |
| title_short |
Veritas observations of day-scale flaring of M 87 in 2010 April |
| title_full |
Veritas observations of day-scale flaring of M 87 in 2010 April |
| title_fullStr |
Veritas observations of day-scale flaring of M 87 in 2010 April |
| title_full_unstemmed |
Veritas observations of day-scale flaring of M 87 in 2010 April |
| title_sort |
veritas observations of day-scale flaring of m 87 in 2010 april |
| url |
http://hdl.handle.net/20.500.12110/paper_0004637X_v746_n2_p_Aliu |
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