VHE gamma-ray observations of Markarian 501
/ Authors
Whipple Collaboration A. C. Breslin, I. Bond, S. Bradbury, J. Buckley, A. Burdett, M. Carson, D. Carter-Lewis, M. Catanese, M. Cawley, S. Dunlea
and 21 more authors
M. D’Vali, D. Fegan, S. Fegan, J. Finley, J. Gaidos, T. Hall, A. Hillas, D. Horan, J. Kildea, J. Knapp, F. Krennrich, S. LeBohec, R. Lessard, C. Masterson, B. McKernan, J. Quinn, H. Rose, F. Samuelson, G. Sembroski, V. Vassiliev, T. Weekes
/ Abstract
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.
Journal: arXiv: Astrophysics