Discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas
dc.contributor.author | Acciari, V. A. | |
dc.contributor.author | Aliu, E. | |
dc.contributor.author | Beilicke, M. | |
dc.contributor.author | Benbow, W. | |
dc.contributor.author | Boltuch, D. | |
dc.contributor.author | Böttcher, M. | |
dc.contributor.author | Bradbury, S. M. | |
dc.contributor.author | Bugaev, V. | |
dc.contributor.author | Byrum, K. | |
dc.contributor.author | Cesarini, A. | |
dc.contributor.author | Ciupik, L. | |
dc.contributor.author | Cogan, P. | |
dc.contributor.author | Cui, W. | |
dc.contributor.author | Dickherber, R. | |
dc.contributor.author | Duke, C. | |
dc.contributor.author | Falcone, A. | |
dc.contributor.author | Finley, J. P. | |
dc.contributor.author | Finnegan, G. | |
dc.contributor.author | Fortson, L. | |
dc.contributor.author | Furniss, A. | |
dc.contributor.author | Galante, N. | |
dc.contributor.author | Gall, D. | |
dc.contributor.author | Gibbs, K. | |
dc.contributor.author | Guenette, R. | |
dc.contributor.author | Gillanders, G. H. | |
dc.contributor.author | Godambe, S. | |
dc.contributor.author | Grube, J. | |
dc.contributor.author | Hanna, D. | |
dc.contributor.author | Hui, C. M. | |
dc.contributor.author | Humensky, T. B. | |
dc.contributor.author | Imran, A. | |
dc.contributor.author | Kaaret, P. | |
dc.contributor.author | Karlsson, N. | |
dc.contributor.author | Kertzman, M. | |
dc.contributor.author | Kieda, D. | |
dc.contributor.author | Krawczynski, H. | |
dc.contributor.author | Krennrich, F. | |
dc.contributor.author | Lang, M. J. | |
dc.contributor.author | LeBohec, S. | |
dc.contributor.author | Maier, G. | |
dc.contributor.author | McArthur, S. | |
dc.contributor.author | McCann, A. | |
dc.contributor.author | Moriarty, P. | |
dc.contributor.author | Nagai, T. | |
dc.contributor.author | Ong, R. A. | |
dc.contributor.author | Otte, A. N. | |
dc.contributor.author | Pandel, D. | |
dc.contributor.author | Perkins, J. S. | |
dc.contributor.author | Pichel, A. | |
dc.contributor.author | Pohl, M. | |
dc.contributor.author | Quinn, J. | |
dc.contributor.author | Ragan, K. | |
dc.contributor.author | Reyes, L. C. | |
dc.contributor.author | Reynolds, P. T. | |
dc.contributor.author | Roache, E. | |
dc.contributor.author | Rose, H. J. | |
dc.contributor.author | Schroedter, M. | |
dc.contributor.author | Sembroski, G. H. | |
dc.contributor.author | Smith, A. W. | |
dc.contributor.author | Steele, D. | |
dc.contributor.author | Swordy, S. P. | |
dc.contributor.author | Theiling, M. | |
dc.contributor.author | Thibadeau, S. | |
dc.contributor.author | Vassiliev, V. V. | |
dc.contributor.author | Vincent, S. | |
dc.contributor.author | Wakely, S. P. | |
dc.contributor.author | Weekes, T. C. | |
dc.contributor.author | Weinstein, A. | |
dc.contributor.author | Weisgarber, T. | |
dc.contributor.author | Williams, D. A. | |
dc.date.accessioned | 2018-09-20T15:58:54Z | |
dc.date.available | 2018-09-20T15:58:54Z | |
dc.date.issued | 2010-01-14 | |
dc.identifier.citation | 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. (2010). Discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas. The Astrophysical Journal 709 (2), L163-L167 | |
dc.identifier.issn | 2041-8205,2041-8213 | |
dc.identifier.uri | http://hdl.handle.net/10379/10112 | |
dc.description.abstract | 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 similar to 6% of the Crab Nebula flux, the new VERITAS data reveal a prominent flare reaching similar to 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 Gamma <= 1.5. The difficulty in modeling these hard spectral energy distributions in blazar jets has led to a range of theoretical gamma-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. | |
dc.publisher | IOP Publishing | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Ireland | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ | |
dc.subject | bl lacertae objects: individual (1es 1218+304=ver j1221+301) | |
dc.subject | galaxies: active | |
dc.subject | gamma rays: galaxies | |
dc.subject | active galactic nuclei | |
dc.subject | extragalactic background light | |
dc.subject | peaked bl-lacertae | |
dc.subject | w-comae | |
dc.subject | blazars | |
dc.subject | spectra | |
dc.subject | acceleration | |
dc.subject | jet | |
dc.subject | constraints | |
dc.subject | telescope | |
dc.title | Discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas | |
dc.type | Article | |
dc.identifier.doi | 10.1088/2041-8205/709/2/l163 | |
dc.local.publishedsource | http://iopscience.iop.org/article/10.1088/2041-8205/709/2/L163/pdf | |
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