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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Christopoulou, P.E., Goudis, C.D., Solomos, N. et al. NGC 4151 entering in an active phase. Astrophys Space Sci 201, 297–302 (1993). https://doi.org/10.1007/BF00627202
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DOI: https://doi.org/10.1007/BF00627202