Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gaia Parallax of Milky Way Globular Clusters -- A Solution of Mixture
  Model   We have established a mixture model approach to derive the parallax of the
Milky Way globular clusters. It avoids the problem of cluster membership
determination and provides a completely independent astrometrical solution by
purely using the parallax data. This method is validated with simulated
clusters of \cite{2017MNRAS.467..412P}. We have resolved 120 real globular
clusters by the mixture model using parallaxes of the second data release of
\gaia. They construct the largest direct parallax sample up to now. In
comparing with other direct parallax results based on cluster members,
including 75 clusters of \cite{2018A&A...616A..12G}, our method presents its
accuracy, especially for some particular clusters. A systematic offset of
$-27.6\pm1.7$ $\mu$as, together with a scatter of $22.8\pm1.3$ $\mu$as is found
in comparing with other indirect parallax measurements. They are consistent
with the global value and the variation of the zero-point of current \gaia
parallaxes. Distances of several specific nearby globular clusters are
discussed while the closest ones can reach high precisions, even taking the
systematic error into account.

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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-lat
5
The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga