期刊
ASTROPHYSICAL JOURNAL
卷 587, 期 1, 页码 123-127出版社
UNIV CHICAGO PRESS
DOI: 10.1086/368112
关键词
galaxies : active; galaxies : individual (NGC 5548); galaxies : nuclei; galaxies : Seyfert
We investigate possibility of an intrinsic Baldwin effect (i.e., nonlinear emission-line response to continuum variations) in the broad Hbeta emission line of the active galaxy NGC 5548 using cross-correlation techniques to remove light-travel time effects from the data. We find a nonlinear relationship between the Hbeta emission line and continuum fluxes that is in good agreement with theoretical predictions. We suggest that similar analysis of multiple lines might provide a useful diagnostic of physical conditions in the broad-line region.
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