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.
DOIAbstract
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 foun...
Add to ORKG