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I/351 The extended Gaia-PS1-SDSS (GPS1+) proper motion catalog (Tian+, 2020)
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The extended Gaia-PS1-SDSS (GPS1+) proper motion catalog.
Tian H.-J., Xu Y., Liu C., Rix H.-W., Sesar B., Goldman B.
<Astrophys. J. Suppl. Ser., 248, 28 (2020)>
=2020ApJS..248...28T
=2021yCat.1351....0T
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ADC_Keywords: Proper motions ; Positional data ; Surveys
Keywords: Galaxy kinematics ; Astrometry ; Catalogs ; Galaxy dynamics ;
Proper motions
Abstract:
The Gaia + PanSTARRS1 (PS1) + Sloan Digital Sky Survey (SDSS) + Two
Micron All-Sky Survey (2MASS) (GPS1) catalog was released in 2017. It
delivered precise proper motions for around 350 million sources down
to a magnitude of r 20mag. In this study, we present GPS1+, the
extension GPS1 catalog down to r 22.5mag, based on Gaia data release 2
(DR2), PS1, SDSS, and 2MASS astrometry. GPS1+ totally provides proper
motions for 400 million sources with a characteristic systematic
error of less than 0.1mas/yr. This catalog is divided into two
subsamples, i.e., the primary and secondary parts. The primary
264 million sources have either or both Gaia and SDSS astrometry,
with a typical precision of 2.0-5.0mas/yr. In this part, 160 million
sources have Gaia proper motions, and we provide another new proper
motion for each of them by building a Bayesian model. Relative to
Gaia's values, the precision is improved by 0.1dex on average; 50
million sources are the objects whose proper motions are missing in
Gaia DR2, and we provide their proper motions with a precision of
4.5mas/yr. The remaining 54 million faint sources are beyond Gaia
detecting capability, and we provide their proper motions for the
first time with a precision of 7.0mas/yr. However, the secondary
136 million sources only have PS1 astrometry, where the average
precision is worse than 15.0mas/yr. The large uncertainty probably
limits it to qualitative applications. All the proper motions have
been validated using QSOs and the existing Gaia proper motions. The
catalog will be available via the TAP Service in the German
Astrophysical Virtual Observatory.
Description:
We still use the four basic imaging surveys, i.e., Gaia, PS1 (II/349),
SDSS, and 2MASS, to build the GPS1+ catalog. Unlike GPS1 (I/343),
GPS1+ will be based on the Gaia DR2 (I/345), but the other three
astrometric data sets remain the same as those used in GPS1, i.e., the
same data version and treatment.