Iron Emission: A Powerful Probe of the Quasar Central Engine

Details Iron Emission: A Powerful Probe of the Quasar Central Engine Iron Emission: A Powerful Probe of the Quasar Central Engine

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9549v&link_type=abstract

HST Proposal ID #9549

Computer Science

Hst Proposal Id #9549 Agn/Quasars

Scientific paper

We will study the optical and UV feii emission in a large sample of low-z active galaxies with the primary goal to constrain the origin of this emission and to gain insight into the unknown feii excitation mechanisms. This will enable significant progress to be made in the theoretical modeling of the complex feii spectrum. Understanding this spectrum is key as feii is THE major coolant of the broad line region {BLR}, which is expected to be energetically important for the central engine. We will use mostly hst archival data but also available X-ray and ground-based data. We will apply our own improved version of the successful feii template fitting method to extract, accurately measure, and study the complicated feii emission spectrum, which is hard to measure with traditional methods. We will analyze the resulting unique database of feii emission spectra in two ways: {1} We will perform multivariate analyses to quantify how the UV feii relates to the X-ray and UV continuum properties and to the optical feii emission. {2} We will analyze the archival hst UV and available optical data from the AGN Watch monitoring program of NGC 5548 to assess how the UV and optical feii interrelate and respond to variations in the UV continuum, one of the potential feii drivers. Our broad goal is to ultimately quantify the conditions favorable for the generation of feii emission.

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