Optical monitoring of the nuclear variability of the Seyfert galaxy NGC 4151

Details Optical monitoring of the nuclear variability of the Seyfert galaxy NGC 4151 Optical monitoring of the nuclear variability of the Seyfert galaxy NGC 4151

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229...80s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 80-82.

Astronomy and Astrophysics

Astrophysics

13

Galactic Nuclei, Seyfert Galaxies, Astronomical Photometry, Astronomical Spectroscopy

Scientific paper

Flux from the active nucleus of NGC 4151 has been monitored for as many nights as possible within not greater than 3-week periods in 1987, 1988, and 1989 at optical wavelengths, in order to detect the shortest period in its temporal variability. The galaxy has been shown to be in a quiescent phase during each of the 18- and 20-night periods in 1987 and 1988, but a jump of 0.234 mag was observed in the U-band over just seven nights during the 21-night period in 1989.

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