TeV Observations of the Variability and Spectrum of Markarian 501
J. Quinn, I. H. Bond, P. J. Boyle, J. H. Buckley, S. M. Bradbury, A. C. Breslin, A. M. Burdett, J. Bussons Gordo, D. A. Carter-Lewis, M. Catanese, M. F. Cawley, D. J. Fegan, J. P. Finley, J. A. Gaidos, A. Hall, A. M. Hillas, F. Krennrich, R. C. Lamb, R. W. Lessard, C. Masterson, J. E. McEnery, G. Mohanty, P. Moriarty, A. J. Rodgers, H. J. Rose, F. W. Samuelson, G. H. Sembroski, R. Srinivasan, T. C. Weeke, J. Zweerink
Abstract
Markarian 501 is only the second extragalactic source to be detected with high statistical certainty at TeV energies; it is similar in many ways to Markarian 421. The Whipple Observatory gamma-ray telescope has been used to observe the AGN Markarian 501 in 1996 and 1997, the years subsequent to its initial detection. The apparent variability on the one-day time-scale observed in TeV gamma rays in 1995 is confirmed and compared with the variability in Markarian 421. Observations at X-ray and optical wavelengths from 1997 are also presented.
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