Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dust-to-gas ratios in the Kepler supernova remnant   A new method to evaluate the dust-to-gas ratios in the Kepler SNR is
presented. Dust emission in the infrared and bremsstrahlung are calculated
consistently, considering that dust grains are collisionally heated by the gas
throughout the front and downstream of both the expanding and the reverse
shocks. The dust-to-gas ratios are determined by the ratio of the dust emission
bump and bremsstrahlung in the infrared. A maximum dust mass < 0.16 Mo is
calculated.

35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat