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I/343 Gaia-PS1-SDSS (GPS1) proper motion catalog (Tian+, 2017)
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A Gaia-PS1-SDSS (GPS1) proper motion catalog covering 3/4 of the sky.
Tian H.-J., Gupta P., Sesar B., Rix H.-W., Martin N.F., Liu C., Goldman B.,
Platais I., Kudritzki R.-P., Waters C.Z.
<Astrophys. J. Suppl. Ser., 232, 4-4 (2017)>
=2017ApJS..232....4T (SIMBAD/NED BibCode)
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ADC_Keywords: Proper motions ; Photometry, ugriz ; Photometry, infrared ;
Positional data ; Surveys
Keywords: astrometry; catalogs; Galaxy: kinematics and dynamics; proper motions
Abstract:
We combine Gaia DR1, PS1, Sloan Digital Sky Survey (SDSS), and 2MASS
astrometry to measure proper motions for 350 million sources across
three-fourths of the sky down to a magnitude of m_r_ 20. Using
positions of galaxies from PS1, we build a common reference frame for
the multi-epoch PS1, single-epoch SDSS and 2MASS data, and calibrate
the data in small angular patches to this frame. As the Gaia DR1
excludes resolved galaxy images, we choose a different approach to
calibrate its positions to this reference frame: we exploit the fact
that the proper motions of stars in these patches are linear. By
simultaneously fitting the positions of stars at different epochs
of-Gaia DR1, PS1, SDSS, and 2MASS-we construct an extensive catalog of
proper motions dubbed GPS1. GPS1 has a characteristic systematic error
of less than 0.3mas/yr and a typical precision of 1.5-2.0mas/yr. The
proper motions have been validated using galaxies, open clusters,
distant giant stars, and QSOs. In comparison with other published
faint proper motion catalogs, GPS1's systematic error (<0.3mas/yr)
should be nearly an order of magnitude better than that of PPMXL and
UCAC4 (>2.0mas/yr). Similarly, its precision ( 1.5mas/yr) is a
four-fold improvement relative to PPMXL and UCAC4 ( 6.0mas/yr). For
QSOs, the precision of GPS1 is found to be worse ( 2.0-3.0mas/yr),
possibly due to their particular differential chromatic refraction.
Description:
In order to construct proper motions, we analyze and model catalog
positions from four different imaging surveys, as discussed below.
Gaia DR1 is based on observations collected between 2014 July 25 and
2015 September 16. PS1 observations were collected between 2010 and
2014. The SDSS DR9 data used here were obtained in the years between
2000 and 2008. The images from 2MASS were taken between 1997 and 2001.