Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Order parameters for the high-energy spectra of pulsars   From the hundreds of gamma-ray pulsars known, only a handful show non-thermal
X-ray pulsations. Instead, nine objects pulse in non-thermal X-rays but lack
counterparts at higher energies. Here, we present a physical model for the
non-thermal emission of pulsars above 1 keV. With just four physical
parameters, we fit the spectrum of the gamma/X-ray pulsars along seven orders
of magnitude. We find that all detections can be encompassed in a continuous
variation of the model parameters, and pose that their values could likely
relate to the closure mechanism operating in the accelerating region. The model
explains the appearance of sub-exponential cutoffs at high energies as a
natural consequence of synchro-curvature dominated losses, unveiling that
curvature-only emission may play a relatively minor role --if any-- in the
spectrum of most pulsars. The model also explains the flattening of the X-ray
spectra at soft energies as a result of propagating particles being subject to
synchrotron losses all along their trajectories. Using this model, we show how
observations in gamma-rays can predict the detectability of the pulsar in
X-rays, and viceversa.

24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph