The extended Gaia-PS1-SDSS (GPS1+) proper motion catalog. (arXiv:2004.12641v2 [astro-ph.GA] UPDATED)

The extended Gaia-PS1-SDSS (GPS1+) proper motion catalog. (arXiv:2004.12641v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Tian_H/0/1/0/all/0/1">Hai-Jun Tian</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Xu_Y/0/1/0/all/0/1">Yang Xu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Liu_C/0/1/0/all/0/1">Chao Liu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rix_H/0/1/0/all/0/1">Hans-Walter Rix</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sesar_B/0/1/0/all/0/1">Branimir Sesar</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Goldman_B/0/1/0/all/0/1">Bertrand Goldman</a>

The GPS1 catalog was released in 2017. It delivered precise proper motions
for around 350 million sources across three-fourths of the sky down to a
magnitude of $rsim20$,mag. In this study, we present GPS1+ the extension GPS1
catalog down to $rsim22.5$,mag, based on {it Gaia} DR2, PS1, SDSS and 2MASS
astrometry. The GPS1+ totally provides proper motions for $sim$400 million
sources with a characteristic systematic error of less than 0.1masyr. This
catalog is divided into two sub-samples, i.e., the primary and secondary parts.
The primary $sim$264 million sources have either or both of the {it Gaia} and
SDSS astrometry, with a typical precision of 2.0-5.0 masyr. In this part,
$sim$160 million sources have {it Gaia} proper motions, we provide another
new proper motion for each of them by building a Bayesian model. Relative to
{it Gaia}’s values, the precision is improved by $sim$0.1,dex on average at
the faint end; $sim$50 million sources are the objects whose proper motions
are missing in {it Gaia} DR2, we provide their proper motion with a precision
of $sim$4.5masyr; the remaining $sim$54 million faint sources are beyond
{it Gaia} detecting capability, we provide their proper motions for the first
time with a precision of 7.0 masyr. However, the secondary $sim$136 million
sources only have PS1 astrometry, the average precision is worse than 15.0
masyr. All the proper motions have been validated using QSOs and the existing
{it Gaia} proper motions. The catalog will be released on-line and available
via the VO-TAP Service, or via the National Astronomical Data Center serviced
by China-VO: https://nadc.china-vo.org/data/data/gps1p/f.

The GPS1 catalog was released in 2017. It delivered precise proper motions
for around 350 million sources across three-fourths of the sky down to a
magnitude of $rsim20$,mag. In this study, we present GPS1+ the extension GPS1
catalog down to $rsim22.5$,mag, based on {it Gaia} DR2, PS1, SDSS and 2MASS
astrometry. The GPS1+ totally provides proper motions for $sim$400 million
sources with a characteristic systematic error of less than 0.1masyr. This
catalog is divided into two sub-samples, i.e., the primary and secondary parts.
The primary $sim$264 million sources have either or both of the {it Gaia} and
SDSS astrometry, with a typical precision of 2.0-5.0 masyr. In this part,
$sim$160 million sources have {it Gaia} proper motions, we provide another
new proper motion for each of them by building a Bayesian model. Relative to
{it Gaia}’s values, the precision is improved by $sim$0.1,dex on average at
the faint end; $sim$50 million sources are the objects whose proper motions
are missing in {it Gaia} DR2, we provide their proper motion with a precision
of $sim$4.5masyr; the remaining $sim$54 million faint sources are beyond
{it Gaia} detecting capability, we provide their proper motions for the first
time with a precision of 7.0 masyr. However, the secondary $sim$136 million
sources only have PS1 astrometry, the average precision is worse than 15.0
masyr. All the proper motions have been validated using QSOs and the existing
{it Gaia} proper motions. The catalog will be released on-line and available
via the VO-TAP Service, or via the National Astronomical Data Center serviced
by China-VO: https://nadc.china-vo.org/data/data/gps1p/f.

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