Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11752d&link_type=abstract
HST Proposal ID #11752. Cycle 17
Other
Scientific paper
We will be using archival STIS and FOS spectroscopy to identify and model the broad emission lines for 14 nearby, low luminosity AGNs {LLAGNs} whose the central mass distributions have been determined from gas kinematics. Since the 2-D gravitational field strength is already known for these galaxies, the relationship between velocity and radius may be established, given a kinematic model for the broad emission line gas. We will investigate various kinematic models for the broad line gas including inflow, rotating accretion disks and the atmospheres of stars orbiting close to the AGN. These low luminosity AGNs are unable to sustain outflows which greatly simplifies the modeling. We have already demonstrated in a recent publication {Devereux & Shearer 2007} that our new analysis technique has the potential to yield the size of the broad line region, the mass inflow rate, the volume filling factor, and the radial density profile for the broad line gas. Additionally, archival WFPC2 and ACS UV imaging will allow us to measure, or set a limit, on the ionization provided by the AGN, for half of the galaxies in our sample. We have a Cycle 17 GO proposal {# 106} pending to image the remainder with the SBC of ACS. Our recently published results indicate that the broad line region in M81 is very large 1 pc which may explain why the AGN is unable to sustain the ionization seen there. We wish to explore this discrepancy for the other galaxies in our sample. However, regardless of whether or not our GO proposal is accepted, this archival proposal will allow us to find the broad line region size for 14 nearby low luminosity AGNs and the relationship between broad line region size and ionization for 6 of these.;
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