Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new search strategy for microquasar candidates using NVSS/2MASS and
  XMM-Newton data   Microquasars are ideal natural laboratories for understanding
accretion/ejection processes, studying the physics of relativistic jets, and
testing gravitational phenomena. Nevertheless, these objects are difficult to
find in our Galaxy. The main goal of this work is to increase the number of
known systems of this kind. We have developed an improved search strategy based
on positional cross-identification with very restrictive selection criteria to
find new MQs, taking advantage of more sensitive modern radio and X-ray data.
We find 86 sources with positional coincidence in the NVSS/XMM catalogs at
|b|<10 deg. Among them, 24 are well-known objects and the remaining 62 sources
are unidentified. For the fully coincident sources, whenever possible, we
analyzed color-color and hardness ratio diagrams and found that at least 3 of
them display high-mass X-ray binary characteristics, making them potential
microquasar candidates.

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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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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: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th