Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Astrometric excess noise in Gaia EDR3 and the search for X-ray binaries   Astrometric noise (AEN) in excess of parallax and proper motion is a
potential signature of orbital wobble of individual components in binary star
systems. The combination of X-ray selection with astrometric noise could then
be a powerful tool for robustly isolating accreting binaries in large surveys.
Here, we mine the Gaia EDR3 catalogue for Galactic sources with significant
values of astrometric noise over the parameter space expected for known and
candidate X-ray binaries (XRBs). Cross-matching our sample with the Chandra
Source Catalogue returns a primary sample of ~6,500 X-ray sources with
significant AEN. X-ray detection efficiency for objects with significant AEN is
a factor of ~4.5 times higher than in a matched control sample exhibiting low
AEN. The primary sample branches off the main sequence much more than control
objects in colour-mag space, and includes a higher fraction of known binaries,
variables and young stellar object class types. However, values of AEN reported
in the Gaia pipeline releases so far can exceed expectations for individual
XRBs with known semi-major axis size and other system parameters. It is likely
that other factors (possibly attitude and modelling uncertainties, as well as
source variability) currently dominate the observed excess noise in such
systems. Confirmation of their nature must therefore await future Gaia
releases. The full X-ray matched catalogue is released here to enable legacy
follow-up.

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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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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: stat
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys