VHE gamma-ray observations of Markarian 501
Whipple Collaboration · Breslin, A. C. · Bond, I. H. · Bradbury, S. M. · Buckley, J. H. · Burdett, A. M. · Carson, M. J. · Carter-Lewis, D. A. · Catanese, M. · Cawley, M. F. · Dunlea, S. · D'Vali, M. · Fegan, D. J. · Fegan, S. J. · Finley, J. P. · Gaidos, J. A. · Hall, T. A. · Hillas, A. M. · Horan, D. · Kildea, J. · Knapp, J. · Krennrich, F. · LeBohec, S. · Lessard, R. W. · Masterson, C. · McKernan, B. · Quinn, J. · Rose, H. J. · Samuelson, F. W. · Sembroski, G. H. · Vassiliev, V. V. · Weekes, T. C.
Original · EN
Markarian 501, a nearby (z=0.033) X-ray selected BL Lacertae object, is a well established source of Very High Energy (VHE, E>=300 GeV) gamma rays. Dramatic variability in its gamma-ray emission on time-scales from years to as short as two hours has been detected. Multiwavelength observations have also revealed evidence that the VHE gamma-ray and hard X-ray fluxes may be correlated. Here we present results of observations made with the Whipple Collaboration's 10 m Atmospheric Cerenkov Imaging Telescope during 1999 and discuss them in the context of observations made on Markarian 501 during the period from 1996-1998.
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