Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio counterparts of gamma-ray sources in the Cygnus region   The view of the gamma-ray universe is being continuously expanded by space
high energy (HE) and ground based very-high energy (VHE) observatories. Yet,
the angular resolution limitation still precludes a straightforward
identification of these gamma-ray emitting sources. Radio observations are an
effective tool for searching their possible counterparts at lower energies
because the same population of relativistic electrons responsible for radio
emission can also produce HE/VHE emission via inverse-Compton scattering. The
Cygnus region is crowded by many gamma-ray sources, most of them remaining
unidentified. In order to find possible counterparts to unidentified gamma-ray
sources, we carried out a deep survey of the Cygnus region using the Giant
Metrewave Radio Telescope at 610 MHz and 325 MHz. We did a detailed search for
counterparts in the error circle of HE/VHE sources. We report 36 radio sources
found in the error ellipse of 15 HE sources, and 11 in those of VHE sources.
Eight sources have very steep radio spectral index alpha <-1.5, which are most
likely to be pulsars and will be followed up for periodicity search. Such a
significant number of pulsar candidates within the error circle of HE/VHE
sources prompts fresh look at the energetics and efficacy of pulsars and pulsar
wind nebulae in this context.

16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci