10305( 1) - 04/02/04 11:30 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10305 Version: 1 Check-in Date: 02-Apr-2004 11:30:30 1.Proposal Title: Outflows from Seyfert galaxies: a challenge to current models ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance AR 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Daniel Proga University of Colorado at Boulder CoI: Dr. Timothy R. Kallman NASA Goddard Space Flight Center N CoI: Prof. Mitchell C. Begelman University of Colorado at Boulder N CoI: Dr. Nahum Arav University of Colorado at Boulder N ------------------------------------------------------------------------------------ 6. Abstract We propose to continue our study of outflows from active galactic nuclei (AGN). This phenomenon has been extensively observed with HST as well as modeled. The overall result from previous studies, including our own ongoing HST program, is that broad absorption lines (BAL) in QSOs can be well understood and reproduced within the framework of radiation-driven disk wind models. It is also very likely that the same model is capable of explaining broad emission lines. However, this model is less successful in explaining narrow absorption lines (NAL) observed in Seyfert galaxies. Therefore, we propose to extend the model by including magnetic field effects. Hydromagnetic propulsion is a likely mechanism responsible for producing low velocity outflows from larger radii and thus explaining NAL and their lack of short- term variability. We will continue to use the multi-dimensional, time-dependent, magnetohydrodynamical code ZEUS to compute the wind structure. We will also compute synthetic line profiles and continuum spectra based on the theoretical model and compare the results with HST/STIS and other observations. In general, we propose to follow the procedure which we successfully applied to winds in cataclysmic variables and BAL QSOs. ------------------------------------------------------------------------------------ 10305( 1) - 04/02/04 11:30 - [ 2] Summary Form for Proposal 10305 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category AR ------------------------------------------------------------------------------------------------------------------------------------