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

Abstract

view Abstract Citations (50) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectroscopic Monitoring of Active Galactic Nuclei from CTIO. I. NGC 3227 Winge, Claudia ; Peterson, Bradley M. ; Horne, Keith ; Pogge, Richard W. ; Pastoriza, Miriani G. ; Storchi-Bergmann, Thaisa Abstract 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 Hβ and He II λ4686 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 Hβ and He II λ4686 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 > 10 Gyr) with a metallicity twice the solar value. The synthesis also yields an internal color excess E(B - V)~0.04. The mean contribution of the stellar population to the inner 5" x 10" spectra during the campaign was ~40%. Publication: The Astrophysical Journal Pub Date: June 1995 DOI: 10.1086/175730 Bibcode: 1995ApJ...445..680W Keywords: Active Galactic Nuclei; Light Curve; Mapping; Seyfert Galaxies; Star Distribution; Emission Spectra; H Beta Line; H Ii Regions; Metallicity; Time Series Analysis; Astronomy; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 3227; GALAXIES: SEYFERT; GALAXIES: STELLAR CONTENT full text sources ADS | data products SIMBAD (1) NED (1) Related Materials (1) Part 2: 1996ApJ...469..648W