Structure of the Accretion Disk in the NLS1 NGC 4051

Details Structure of the Accretion Disk in the NLS1 NGC 4051 Structure of the Accretion Disk in the NLS1 NGC 4051

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9850p&link_type=abstract

HST Proposal ID #9850

Computer Science

Hst Proposal Id #9850 Agn/Quasars

Scientific paper

We propose to obtain a UV spectrum of the narrow-line Seyfert 1 {NLS1} galaxy on a target-of-opportunity basis when it goes into a faint state for the purpose of exploring the variable nature of the shape of the ionizing continuum in this source. Previous simultaneous X-ray and optical monitoring of this source reveals that at some times the X-rays and the He II 4686 emission line nearly disappear, while the UV/optical continuum and Balmer lines are weaker, but present and continue to vary. This suggests that there is a variable cutoff in the shape of the ionizing continuum, and in the faint state this occurs at low enough energies to affect all the strong UV lines. By comparing emission-line flux ratios in the low state to those in high states and with photoionization equibrium calculations, we can identify the cutoff energy. The cutoff energy may correspond to a transition radius in the accretion disk, inside of which the source has entered into a low-radiative efficiency mode.

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