Optical variability of the Seyfert nucleus NGC 7469 in timescales from days to minutes

Details Optical variability of the Seyfert nucleus NGC 7469 in timescales from days to minutes Optical variability of the Seyfert nucleus NGC 7469 in timescales from days to minutes

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1769d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 1769-1787. Research supported by Universidad Nacional Auto

Astronomy and Astrophysics

Astronomy

32

Active Galactic Nuclei, Astronomical Photometry, Irregular Galaxies, Seyfert Galaxies, Variability, Accretion Disks, Black Holes (Astronomy), Brightness Distribution, Starburst Galaxies

Scientific paper

Optical observations of the Seyfert nucleus NGC 7469 are reported. During the first observing run in 1989, night-to-night measurements were performed during 13 photometric nights spanning November 3-30. The largest variation, 0.403 m, within a 20-arcsec diaphragm, occurred in 11 d, and a decrease in brightness of 0.337 m occurred in only 5 d. During the second run in August 1990, all-night monitoring was conducted during five photometric nights using differential photometry techniques. It is concluded that random variability was present during the first four nights with average amplitude of about 0.040 m on average time scales of about 13 min. During the fifth night the variability nearly disappeared. The average fluctuations imply an 8-percent variation in the luminosity of the unresolved nucleus and a rate of change of about 6 x 10 exp 37 erg/sq s. It is argued that the present observations favor the black hole model and that random variability may be explained by the development of local instabilities in the accretion disk.

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