An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548

Details An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548 An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548

2002-12-17

arxiv.org/abs/astro-ph/0212379v1

Astrophys.J. 587 (2003) 123-127

Astronomy and Astrophysics

Astrophysics

15 pages, 4 figures. Accepted for publication in The Astrophysical Journal

Scientific paper

10.1086/368112

We investigate the possibility of an intrinsic Baldwin Effect (i.e.,nonlinear emission-line response to continuum variations) in the broad H-beta 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 H-beta 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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