Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-ray Emission from Strongly Asymmetric Circumstellar Material in the
  Remnant of Kepler's Supernova   Kepler's supernova remnant resulted from a thermonuclear explosion, but is
interacting with circumstellar material (CSM) lost from the progenitor system.
We describe a statistical technique for isolating X-ray emission due to CSM
from that due to shocked ejecta. Shocked CSM coincides well in position with 24
$\mu$m emission seen by {\sl Spitzer}. We find most CSM to be distributed along
the bright north rim, but substantial concentrations are also found projected
against the center of the remnant, roughly along a diameter with position angle
$\sim 100^\circ$. We interpret this as evidence for a disk distribution of CSM
before the SN, with the line of sight to the observer roughly in the disk
plane. We present 2-D hydrodynamic simulations of this scenario, in qualitative
agreement with the observed CSM morphology. Our observations require Kepler to
have originated in a close binary system with an AGB star companion.

36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc