High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. II - NGC 5548

Details High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. II - NGC 5548 High-rate spectroscopic active galactic nucleus monitoring at the Wise Observatory. II - NGC 5548

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..108n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 108-113. Research supported by the U.S. - Israel Bi

Mathematics

Probability

49

Active Galactic Nuclei, Astronomical Spectroscopy, Seyfert Galaxies, Astronomical Observatories, Charge Coupled Devices, Monte Carlo Method, Photoionization, Spectral Line Width

Scientific paper

Further results are reported from the spectroscopic monitoring of AGN, described by Maoz et al. (1990), for the Seyfert galaxy NGC 5548. The high sampling rate (44 spectra during a 149-day period) and measurement accuracy (3-4 percent in absolute flux) of the observations allow the resolution of a small pulse in H-alpha, H-beta, and the optical continuum in this object during May-June of 1988. Cross-correlation of the line and continuum light curves yields a very significant peak at a lag of 7 days in the mission-line response to continuum variations. Using Monte-Carlo simulations, the size of the broad-line region (BLR) in this galaxy is found to be 4-10 lt-days with a probability of 68 percent. These results rule out, at the 95-percent significance level, a BLR 14 lt-days or larger for several different assumed gas distributions.

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