Three-Dimensional Fabry-Perot Imaging of Filamentary Structures in Cas A and Nova GK Persei
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**Session 2 -- Planetary Nebula and Supernova Remnants**
*Display presentation, Monday, 9:20-6:30, Pauley Room*

## [2.13] Three-Dimensional Fabry-Perot Imaging of Filamentary Structures in Cas A and Nova GK Persei

*S. Lawrence, G. MacAlpine (U. Mich.), A. Uomoto (JHU), B. Woodgate, W. Waller, L. Brown, R. Oliversen (GSFC)*
Previous two-dimensional spectroscopy of Cas A and Nova GK Persei has shown
that these objects have significant asymmetries and anisotropies in their
filamentary structures, velocity fields and elemental abundance distributions.
This work expands our views of these objects into three dimensions using
the first complete Fabry-Perot imaging scans of their filamentary emission.
The Goddard Astronomical Fabry-Perot Imaging Camera was used at the
Michigan-Dartmouth-MIT Observatory 2.4m Hiltner telescope to scan through
the Doppler-broadened line profiles of these objects, generating data cubes
in $\alpha$-$\delta$-$\lambda$ (position-wavelength) space.
By assuming object distances and constant radial velocities, these cubes
were translated into three-dimensional spatial models.

For Cas A, the distribution of the quasi-stationary flocculi was derived from
$\hbox{H}
\alpha\ +$ [NII] $\lambda\lambda$6548, 6583 emission with 150 km
$\hbox{s}^{-1}$ resolution, and the distribution of the fast-moving knots
from [SII] $\lambda\lambda$6717, 6731 emission with 550 km $\hbox{s}^{-1}$
resolution.
For Nova GK Persei, a model was constructed from
$\hbox{H}
\alpha\ +$ [NII] $\lambda\lambda$6548, 6583 emission with a resolution
of 150 km $\hbox{s}^{-1}$.

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