Evidence for long-term gamma-ray and x-ray variability from the unidentified tev source hess j0632+057
- Acciari, V. A.
- Aliu, E.
- Arlen, T.
- Beilicke, M.
- Benbow, W.
- Boltuch, D.
- Bradbury, S. M.
- Buckley, J. H.
- Bugaev, V.
- Byrum, K.
- Cannon, A.
- Cesarini, A.
- Cesarini, A.
- Chow, Y. C.
- Ciupik, L.
- Cogan, P.
- Dickherber, R.
- Duke, C.
- Ergin, T.
- Falcone, A.
- Fegan, S. J.
- Finley, J. P.
- Finnegan, G.
- Fortin, P.
- Fortson, L.
- Furniss, A.
- Gibbs, K.
- Gillanders, G. H.
- Grube, J.
- Guenette, R.
- Gyuk, G.
- Hanna, D.
- Holder, J.
- Horan, D.
- Hui, C. M.
- Humensky, T. B.
- Imran, A.
- Kaaret, P.
- Karlsson, N.
- Kertzman, M.
- Kieda, D.
- Kildea, J.
- Konopelko, A.
- Krawczynski, H.
- Krennrich, F.
- Lang, M. J.
- LeBohec, S.
- LeBohec, S.
- Maier, G.
- McCann, A.
- McCutcheon, M.
- Millis, J.
- Millis, J.
- Moriarty, P.
- Mukherjee, R.
- Ong, R. A.
- Otte, A. N.
- Pandel, D.
- Perkins, J. S.
- Petry, D.
- Pohl, M.
- Quinn, J.
- Ragan, K.
- Reyes, L. C.
- Reynolds, P. T.
- Rose, H. J.
- Schroedter, M.
- Sembroski, G. H.
- Smith, A. W.
- Steele, D.
- Swordy, S.
- Theiling, M.
- Toner, J. A.
- Varlotta, A.
- Vassiliev, V. V.
- Vincent, S.
- Wagner, R. G.
- Wakely, S. P.
- Ward, J. E.
- Weekes, T. C.
- Weinstein, A.
- Weisgarber, T.
- Williams, D. A.
- Wissel, S.
- Wood, M.
DOIAbstract
HESS J0632+057 is one of only two unidentified very-high-energy gamma-ray sources which appear to be point-like within experimental resolution. It is possibly associated with the massive Be star MWC 148 and has been suggested to resemble known TeV binary systems like LS I + 61 303 or LS 5039. HESS J0632+057 was observed by VERITAS for 31 hr in 2006, 2008, and 2009. During these observations, no significant signal in gamma rays with energies above 1 TeV was detected from the direction of HESS J0632+057. A flux upper limit corresponding to 1.1% of the flux of the Crab Nebula has been derived from the VERITAS data. The nondetection by VERITAS excludes with a probability of 99.993% that HESS J0632+057 is a steady gamma-ray emitter. Contemporane...
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