Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Model for the Optical/IR Emission from Magnetars   A number of Anomalous X-ray Pulsars (AXPs) have recently been detected in the
optical/IR wavelengths. We use their inferred brightness to place general
constraints on any model for this emission within the magnetar framework. We
find that neutron-star surface emission cannot account for the observations and
that the emission must be magnetospheric in origin. We propose a model for the
optical/IR emission in which a distribution of energetic electrons in the
neutron-star magnetosphere emits synchrotron radiation. This model can
naturally reproduce the observed brightness and the rising spectra of AXPs as
well as the observed pulsations at the stellar spin frequency and the
correlation of the IR flux with their bursting activity.

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The categories of this paper are: cs
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: math
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph