The size of the broad-line region in the Seyfert galaxy NGC 4151

Details The size of the broad-line region in the Seyfert galaxy NGC 4151 The size of the broad-line region in the Seyfert galaxy NGC 4151

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..111p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 111-120.

Astronomy and Astrophysics

Astrophysics

30

Active Galactic Nuclei, Emission Spectra, Line Spectra, Seyfert Galaxies, Stellar Spectrophotometry, Cross Correlation, H Alpha Line, Ultraviolet Spectra, Variable Stars

Scientific paper

Cross-correlation analysis of broad emission-line and optical continuum fluxes obtained from new spectro-photometric observations of NGC 4151 is used to estimate the size of the broad-line region (BLR) in this galaxy. The size of the BLR is found to be about 6 lt-days, though this may easily be in error by a factor of two. While the uncertainty is rather large, it is emphasized that this is a considerable improvement over previous determinations in which the magnitude of the uncertainties was not fully appreciated. It is also pointed out that there is insufficient evidence to support earlier claims that the different BLR radii inferred from cross-correlation of different broad lines with the continuum provide evidence for ionization stratification within the BLR.

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