Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling SN 1996cr's X-ray lines at high-resolution: Sleuthing the
  ejecta/CSM geometry   SN 1996cr, located in the Circinus Galaxy (3.7 Mpc, z ~ 0.001) was
non-detected in X-rays at ~ 1000 days yet brightened to ~ 4 x 10^{39} erg/s
(0.5-8 keV) after 10 years (Bauer et al. 2008). A 1-D hydrodynamic model of the
ejecta-CSM interaction produces good agreement with the measured X-ray light
curves and spectra at multiple epochs. We conclude that the progenitor of SN
1996cr could have been a massive star, M > 30 M_solar, which went from an RSG
to a brief W-R phase before exploding within its ~ 0.04 pc wind-blown shell
(Dwarkadas et al. 2010). Further analysis of the deep Chandra HETG observations
allows line-shape fitting of a handful of bright Si and Fe lines in the
spectrum. The line shapes are well fit by axisymmetric emission models with an
axis orientation ~ 55 degrees to our line-of-sight. In the deep 2009 epoch the
higher ionization Fe XXVI emission is constrained to high lattitudes: the
Occam-est way to get the Fe H-like emission coming from high latitude/polar
regions is to have more CSM at/around the poles than at mid and lower
lattitudes, along with a symmetric ejecta explosion/distribution. Similar
CSM/ejecta characterization may be possible for other SNe and, with
higher-throughput X-ray observations, for gamma-ray burst remnants as well.

24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex