My main research areas include Supernovae (SNe) and
(SNRs. See the Chandra-view
of SNRs ! ) : their plasma physics and
observations of them with the
HETG on Chandra.
The high resolution of the HETG can provide better identification
and measurement of the emission lines in some SNRs, helping to determine
the plasma properties.
In addition, measurement of Doppler shifts of lines gives velocity
information along the line-of-sight,
adding a "third dimension" to the structure of the remnant.
For more details see the review article
"Kinematics of SN/SNRs: Status of X-Ray Observations",
In the past years I've continued research of core-collapse supernova
remnants (SNRs) using high resolution data from the Chandra HETG.
Research focussed on three objects: SN 1987A, SN 1996cr and the Cas A SNR.
For SN 1987A, HETG lineshapes indicate two Doppler components,
hydrodynamic models of these can be combined to model the observed
spectra and light curves. The results were recently published, see
Dewey et al (2012), http://arxiv.org/abs/1111.5314 .
After initial global hyrodynamic modeling of SN 1996cr (Dwarkadas,
Dewey & Bauer, 2010) detailed fitting was done of the HETG line shapes
using simple 3D models of the ejecta-CSM emission geometry as summarized
in a GRB meeting proceedings article, http://arxiv.org/abs/1102.1442 .
Following the 3-D Cas A modeling progress of DeLaney et al. (2010,
http://arxiv.org/abs/1011.3858), a second epoch HETG observation of
Cas A was taken and analyzed. Spatial-spectral models of individual bright
features were used to determine their velocities and better resolve
closely-spaced emission lines.
Most recently I am working on the 3-epochs of HETG observations of the
SNR E0102 . . .