Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas

We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level of ∼ 6% of the Crab Nebula flux, the new VERITAS data reveal a prominent fla...

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Autores principales: Acciari, V.A., Aliu, E., Beilicke, M., Benbow, W., Boltuch, D., Böttcher, M., Bradbury, S.M., Bugaev, V., Byrum, K., Cesarini, A., Ciupik, L., Cogan, P., Cui, W., Dickherber, R., Duke, C., Falcone, A., Finley, J.P., Finnegan, G., Fortson, L., Furniss, A., Galante, N., Gall, D., Gibbs, K., Guenette, R., Gillanders, G.H., Godambe, S., Grube, J., Hanna, D., 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., Maier, G., McArthur, S., McCann, A., Moriarty, P., Nagai, T., Ong, R.A., Otte, A.N., Pandel, D., Perkins, J.S., Pichel, A., 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., Vassiliev, V.V., Vincent, S., Wakely, S.P., Weekes, T.C., Weinstein, A., Weisgarber, T., Williams, D.A.
Formato: JOUR
Materias:
Galaxies: active
Gamma rays:galaxies
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_20418205_v709_n2PART2_pL163_Acciari
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_20418205_v709_n2PART2_pL163_Acciari2023-10-03T16:37:59Z Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas Acciari, V.A. Aliu, E. Beilicke, M. Benbow, W. Boltuch, D. Böttcher, M. Bradbury, S.M. Bugaev, V. Byrum, K. Cesarini, A. Ciupik, L. Cogan, P. Cui, W. Dickherber, R. Duke, C. Falcone, A. Finley, J.P. Finnegan, G. Fortson, L. Furniss, A. Galante, N. Gall, D. Gibbs, K. Guenette, R. Gillanders, G.H. Godambe, S. Grube, J. Hanna, D. 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. Maier, G. McArthur, S. McCann, A. Moriarty, P. Nagai, T. Ong, R.A. Otte, A.N. Pandel, D. Perkins, J.S. Pichel, A. 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. Vassiliev, V.V. Vincent, S. Wakely, S.P. Weekes, T.C. Weinstein, A. Weisgarber, T. Williams, D.A. Galaxies: active Gamma rays:galaxies We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level of ∼ 6% of the Crab Nebula flux, the new VERITAS data reveal a prominent flare reaching ∼ 20% of the Crab. While very high energy (VHE) flares are quite common in many nearby blazars, the case of 1ES 1218+304 (redshift z = 0.182) is particularly interesting since it belongs to a group of blazars that exhibit unusually hard VHE spectra considering their redshifts. When correcting the measured spectra for absorption by the extragalactic background light, 1ES 1218+304 and a number of other blazars are found to have differential photon indices Γ≤ 1.5. The difficulty in modeling these hard spectral energy distributions in blazar jets has led to a range of theoretical γ-ray emission scenarios, one of which is strongly constrained by these new VERITAS observations. We consider the implications of the observed light curve of 1ES 1218+304, which shows day scale flux variations, for shock acceleration scenarios in relativistic jets, and in particular for the viability of kiloparsec-scale jet emission scenarios. © 2010. 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_20418205_v709_n2PART2_pL163_Acciari
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Galaxies: active
Gamma rays:galaxies
spellingShingle Galaxies: active
Gamma rays:galaxies
Acciari, V.A.
Aliu, E.
Beilicke, M.
Benbow, W.
Boltuch, D.
Böttcher, M.
Bradbury, S.M.
Bugaev, V.
Byrum, K.
Cesarini, A.
Ciupik, L.
Cogan, P.
Cui, W.
Dickherber, R.
Duke, C.
Falcone, A.
Finley, J.P.
Finnegan, G.
Fortson, L.
Furniss, A.
Galante, N.
Gall, D.
Gibbs, K.
Guenette, R.
Gillanders, G.H.
Godambe, S.
Grube, J.
Hanna, D.
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.
Maier, G.
McArthur, S.
McCann, A.
Moriarty, P.
Nagai, T.
Ong, R.A.
Otte, A.N.
Pandel, D.
Perkins, J.S.
Pichel, A.
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.
Vassiliev, V.V.
Vincent, S.
Wakely, S.P.
Weekes, T.C.
Weinstein, A.
Weisgarber, T.
Williams, D.A.
Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
topic_facet Galaxies: active
Gamma rays:galaxies
description We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level of ∼ 6% of the Crab Nebula flux, the new VERITAS data reveal a prominent flare reaching ∼ 20% of the Crab. While very high energy (VHE) flares are quite common in many nearby blazars, the case of 1ES 1218+304 (redshift z = 0.182) is particularly interesting since it belongs to a group of blazars that exhibit unusually hard VHE spectra considering their redshifts. When correcting the measured spectra for absorption by the extragalactic background light, 1ES 1218+304 and a number of other blazars are found to have differential photon indices Γ≤ 1.5. The difficulty in modeling these hard spectral energy distributions in blazar jets has led to a range of theoretical γ-ray emission scenarios, one of which is strongly constrained by these new VERITAS observations. We consider the implications of the observed light curve of 1ES 1218+304, which shows day scale flux variations, for shock acceleration scenarios in relativistic jets, and in particular for the viability of kiloparsec-scale jet emission scenarios. © 2010. The American Astronomical Society. All rights reserved.
format JOUR
author Acciari, V.A.
Aliu, E.
Beilicke, M.
Benbow, W.
Boltuch, D.
Böttcher, M.
Bradbury, S.M.
Bugaev, V.
Byrum, K.
Cesarini, A.
Ciupik, L.
Cogan, P.
Cui, W.
Dickherber, R.
Duke, C.
Falcone, A.
Finley, J.P.
Finnegan, G.
Fortson, L.
Furniss, A.
Galante, N.
Gall, D.
Gibbs, K.
Guenette, R.
Gillanders, G.H.
Godambe, S.
Grube, J.
Hanna, D.
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.
Maier, G.
McArthur, S.
McCann, A.
Moriarty, P.
Nagai, T.
Ong, R.A.
Otte, A.N.
Pandel, D.
Perkins, J.S.
Pichel, A.
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.
Vassiliev, V.V.
Vincent, S.
Wakely, S.P.
Weekes, T.C.
Weinstein, A.
Weisgarber, T.
Williams, D.A.
author_facet Acciari, V.A.
Aliu, E.
Beilicke, M.
Benbow, W.
Boltuch, D.
Böttcher, M.
Bradbury, S.M.
Bugaev, V.
Byrum, K.
Cesarini, A.
Ciupik, L.
Cogan, P.
Cui, W.
Dickherber, R.
Duke, C.
Falcone, A.
Finley, J.P.
Finnegan, G.
Fortson, L.
Furniss, A.
Galante, N.
Gall, D.
Gibbs, K.
Guenette, R.
Gillanders, G.H.
Godambe, S.
Grube, J.
Hanna, D.
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.
Maier, G.
McArthur, S.
McCann, A.
Moriarty, P.
Nagai, T.
Ong, R.A.
Otte, A.N.
Pandel, D.
Perkins, J.S.
Pichel, A.
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.
Vassiliev, V.V.
Vincent, S.
Wakely, S.P.
Weekes, T.C.
Weinstein, A.
Weisgarber, T.
Williams, D.A.
author_sort Acciari, V.A.
title Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
title_short Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
title_full Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
title_fullStr Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
title_full_unstemmed Discovery of variability in the very high energy γ-ray emission of 1ES 1218+304 with veritas
title_sort discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas
url http://hdl.handle.net/20.500.12110/paper_20418205_v709_n2PART2_pL163_Acciari
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