Spectroscopic monitoring of active Galactic nuclei from CTIO. 1: NGC 3227

Details Spectroscopic monitoring of active Galactic nuclei from CTIO. 1: NGC 3227 Spectroscopic monitoring of active Galactic nuclei from CTIO. 1: NGC 3227

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...445..680w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 445, no. 2, p. 680-690

Astronomy and Astrophysics

Astrophysics

42

Active Galactic Nuclei, Light Curve, Mapping, Seyfert Galaxies, Star Distribution, Emission Spectra, H Beta Line, H Ii Regions, Metallicity, Time Series Analysis

Scientific paper

The results of a five-month monitoring campaign on the Seyfert 1.5 galaxy NGC 3227 are presented. Variability was detected in the continuum and in the broad emission lines. Cross correlations of the 4200 A continuum light curve with the H beta and He II wavelength 4686 emission-line light curves indicate delays of 18 +/- 5 and 16 +/- 2 days, respectively, between the continuum variations and the response of the lines. We apply a maximum entropy method to solve for the transfer function that relates the H beta and He II wavelength 4686 lines and 4200 A continuum variability and the result of this analysis suggests that there is a deficit of emission-line response due to gas along the line of sight to the continuum source for both lines. Using a composite off-nuclear spectrum, we synthesize the bulge stellar population, which is found to be mainly old (77% with age greater than 10 Gyr) with a metallicity twice the solar value. The synthesis also yields an internal color excess E(B - V) approximately equal 0.04. The mean contribution of the stellar population to the inner 5 sec x 10 sec spectra during the campaign was approximately equal 40%.

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