[AGN, Quasars, Black Holes -- Oral ]
Spatially Resolved Chandra HETG Spectroscopy of the NLR Ionization
Cone in NGC 1068
Daniel Evans, MIT
Patrick M. Ogle (Caltech), Herman L. Marshall (MIT), Michael A. Nowak (MIT), Kim Weaver (GSFC), Stefano Bianchi (Roma Tre University, Italy), Matteo Guainazzi (ESAC, Spain), Anna Lia Longinotti (MIT), Claude R. Canizares (MIT)
We present results from a new 440-ks Chandra HETG GTO observation
of the canonical Seyfert 2 galaxy NGC 1068. The proximity of NGC 1068,
together with Chandra's superb spatial and spectral resolution, allow an
unprecedented view of its nucleus and circumnuclear NLR. We perform the
first spatially resolved high-resolution X-ray spectroscopy of the
“ionization cone” in any AGN, and use the sensitive line diagnostics
offered by the HETG to measure the ionization state, density, and
temperature at discrete points along the ionized NLR. We argue that the
NLR takes the form of outflowing photoionized gas, rather than gas that
has been collisionally ionized by the small-scale radio jet in NGC 1068.
We investigate evidence for any velocity gradients in the outflow, and
describe our next steps in modeling the NLR as a multiphase biconical
outflow. Our results have key implications for the nature of the nuclei
and circumnuclear environments in AGN, together with the connection
between galactic-scale outflows in AGN as moderators of galaxy evolution.