The Seyfert Galaxy NGC4151 - Peak Activity on the Decline

Details The Seyfert Galaxy NGC4151 - Peak Activity on the Decline The Seyfert Galaxy NGC4151 - Peak Activity on the Decline

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..407c&link_type=abstract

Astronomy and Astrophysics, Vol.272, NO. 2/MAYII, P. 407, 1993

Astronomy and Astrophysics

Astrophysics

Scientific paper

New photometric observations were obtained in 1991 to monitor the active galactic nucleus of the Seyfert galaxy NGC 4151 at optical wavelengths (5672 A continuum and U-band). The results show that the energy output from the nucleus of the galaxy has reached peak values particularly in the U-band where a rise of 1.3 mag, probably the biggest ever detected in the recorded history of the galaxy, was observed with respect to its mean value of the 1987 quiescent phase. This activity seems however to be on the decline (March 1991). If this is not a spurious event, an 8 yr time span scale between the 1983 and 1991 maxima might be relevant to the power mechanism responsible for the activity of the nucleus.

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