Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..416o&link_type=abstract
Astronomy Letters, Volume 19, Issue 6, November 1993, pp.416-419; Pis'ma v Astronomicheskii Zhurnal, Vol. 19, p. 1021
Astronomy and Astrophysics
Astronomy
12
Scientific paper
Based on published photometric monitoring results for NGC 4151 during 1970-1980 in the near infrared, we construct a composite light curve in the K band (2.2 micron). Using special cross-correlation analysis methods, we find that the flux variability in the K band lags that of the U by 18 +/- 6 days. The error in the delay was found by applying cross- correlation analysis to a model series, with the same temporal distribution, power spectrum, and signal-to-noise ratio as the actual data. If the IR emission is due to thermal reemission by dust, for agreement with observations it is necessary to propose a special geometry for the emission region. A model of the IR emitting region as a thin disk with large inclination to the line of sight agrees better with the observational data than a spherically symmetric model. These results, however, do not indicate an unambiguous preference for any one of the possible mechanisms of IR emission.
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