NOAO >   Observing Info >   Approved Programs >   2003B-0107

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Proposal Information for 2003B-0107


PI: Gerald Cecil, University of North Carolina, gerald@thececils.org
Address: Department of Physics and Astronomy, CB\# 3255 Phillips Hall, Chapel, Hill, NC, 27599-3255, USA

CoI: Mike Dopita, Australian National University
CoI: Fred Hamann, University of Florida
CoI: Brent Groves, Australian National University

Title: Dynamics of the Nuclear Outflow in NGC 1068

Abstract: Gas flows at high velocities from AGN, often associated with radio plasma. Associated Absorber Line (AAL) systems appear blueshifted by several thousand km/s from broad UV resonance emission lines; at low-z, 60% of Seyfert 1 galaxies show AALs on C IV but the location of this gas is unknown. With HST/STIS we have mapped the outflow of NGC 1068 in [O III] and Hbeta over 6", finding filaments whose velocities increase smoothly over 20 pcs from a few hundred to several THOUSAND km/s wrt galaxy systemic. This spatially resolved gradient implies an accelerating outflow. The [O III] profiles at least mimic kinematically C IV AAL profiles. We propose to map the outflow in many more spectral lines, to test in detail this resemblance and to study how the radio jet influences gas motions. GMOS/IFU would obtain optical emission-line spectra spanning 100 eV in ionization whose flux ratios map gas temperatures, densities, and ionization parameters. We would then model photoionization to constrain the gas column hence total mass at various flow points to develop robust constraints on the flow KE hence duty cycle and nature of the particle accelerator. This program would highlight the revolutionary capabilities of the GMOS/IFU and its important synergy with space observatories on apparently complex flows.


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