Detection of the bl lacertae object h1426+428 at tev gamma‐ray energies
- Horan, D.
- Badran, H. M.
- Bond, I. H.
- Bradbury, S. M.
- Buckley, J. H.
- Carson, M. J.
- Carter‐Lewis, D. A.
- Catanese, M.
- Cui, W.
- Dunlea, S.
- Das, D.
- de la Calle Perez, I.
- D’Vali, M.
- Fegan, D. J.
- Fegan, S. J.
- Finley, J. P.
- Gaidos, J. A.
- Gibbs, K.
- Gillanders, G. H.
- Hall, T. A.
- Hillas, A. M.
- Holder, J.
- Jordan, M.
- Kertzman, M.
- Kieda, D.
- Kildea, J.
- Knapp, J.
- Kosack, K.
- Krennrich, F.
- Lang, M. J.
- LeBohec, S.
- Lessard, R.
- Lloyd‐Evans, J.
- McKernan, B.
- Moriarty, P.
- Muller, D.
- Ong, R.
- Pallassini, R.
- Petry, D.
- Quinn, J.
- Reay, N. W.
- Reynolds, P. T.
- Rose, H. J.
- Sembroski, G. H.
- Sidwell, R.
- Stanton, N.
- Swordy, S. P.
- Vassiliev, V. V.
- Wakely, S. P.
- Weekes, T. C.
DOIAbstract
A very high energy gamma-ray signal has been detected at the 5.5sigma level from H1426+ 428, an X-ray-selected BL Lacertae object at a redshift of 0.129. The object was monitored from 1995 to 1998 with the Whipple 10 m imaging atmospheric Cerenkov telescope as part of a general blazar survey; the results of these observations, although not statistically significant, were consistently positive. X-ray observations of H1426+ 428 during 1999 with the BeppoSAX instrument revealed that the peak of its synchrotron spectrum occurs at greater than 100 keV, leading to the prediction of observable TeV emission from this object. H1426+ 428 was monitored extensively at the Whipple Observatory during the 1999, 2000, and 2001 observing seasons. The strong...
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