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P. M. Nied (Metro. St. Col. of Denver), A. C. Sadun, M. Kelly, V. Phillips, P. Baca, J. Holt, A. Galadari (U. Colorado--Denver), P. Boltwood (Boltwood Obs.), H. Krawczynski (Yale U., MPIK Heidelberg), F. Aharonian, D. Horns (MPIK Heidelberg)
We present the results of multifrequency monitoring of the Seyfert galaxy Mkn 421 in optical (R band) and TeV frequencies. The optical data were taken over approximately four months at the Sommers-Bausch Observatory (U. Colorado-Boulder), and at Boltwood Observatory in Canada. The TeV data were taken as part of the HEGRA collaboration.
Routine optical analysis is made to determine maximum size and mass of the emitting region. We also investigate the spectral changes over the optical to TeV range.
We believe we see a mild inverse correlation between the bright and dim phases of the optical and TeV data, respectively. This could be indicative of a lag period between the two brightness increases or, this could be indicative of the suppression of one energy channel in response to the emission in the other. To do a proper cross-correlation frequency study one would require more data, particularly in the TeV. Any subsequent project involving the observation of Mkn 421 will require a denser data set.