Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A complete radio study of SNR G15.4+0.1 from new GMRT observations   The supernova remnant G15.4+0.1 is considered to be the possible counterpart
of the gamma-ray source HESSJ1818-154. With the goal of getting a complete view
of this remnant and understanding the nature of the gamma-ray flux, we
conducted a detailed radio study that includes the search for pulsations and a
model of the broadband emission for the G15.4+0.1/HESSJ1818-154 system.
Low-frequency imaging at 624 MHz and pulsar observations at 624 and 1404 MHz
towards G15.4+0.1 were carried out with the Giant Metrewave Radio Telescope
(GMRT). We correlated the new radio data with observations of the source at
X-ray and infrared wavelengths from XMM-Newton and Herschel observatories,
respectively. To characterize the neutral hydrogen medium (HI) towards
G15.4+0.1, we used data from the Southern Galactic Plane Survey. We modelled
the spectral energy distribution using both hadronic and leptonic scenarios.
From the combination of the new GMRT observations with existing data, we
derived a continuum spectral index alpha=-0.62+-0.03 for the whole remnant. The
local synchrotron spectra of G15.4+0.1, calculated from the combination of the
GMRT data with 330 MHz observations from the VLA, tends to be flatter in the
central part of the remnant, accompanying the region where the blast wave is
impinging molecular gas. No spectral index trace was found indicating the radio
counterpart to the pulsar wind nebula proposed from X-ray observations. In
addition, the search for radio pulsations yielded negative results. Emission at
far-infrared wavelengths is observed in the region where the SNR shock is
interacting with dense molecular clumps. We also identified HI features forming
a shell that wraps most of the outer border of G15.4+0.1. Characteristic
parameters were estimated for the shocked HI gas. We found that either a purely
hadronic or leptonic model is compatible with the broadband emission known so
far.

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The categories of this paper are: hep-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn