NGC 4151 entering in an active phase |
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| Authors: | P -E Christopoulou C D Goudis N Solomos S Kemp |
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| Institution: | (1) Astronomical Laboratory, Department of Physics, University of Patras, Greece;(2) Present address: Department of Astronomy, Queens University, Belfast, Northern Ireland |
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| Abstract: | Photometric observations of the nucleus of NGC 4151 obtained in a period of 16 nights in April 1990 in the 5672 Å continuum and theU-band have clearly shown that the nucleus has entered into an active phase and its energy output is still rising. |
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