He II Reverberation in AGN

Details He II Reverberation in AGN He II Reverberation in AGN

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..311..179b&link_type=abstract

AGN Physics with the Sloan Digital Sky Survey, Proceedings of a conference held in Princeton, NJ, USA, 27-31 July 2003, Edited b

Physics

Scientific paper

Observations of emission line variability in the broad line region (BLR) of active galactic nuclei (AGN) show that the response of He II (λ)1640 to changes in the ionizing continuum of the central engine is three times shorter than that of He II (λ)4686 and C IV (λ)1549. Various models invoking radius-dependent pressure laws, locally optimally emitting cloud distributions, anisotropic beaming, and disk obscuration do not reproduce this observation. This suggests that an important component of AGN structure has yet to be explained.

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