I/343 Gaia-PS1-SDSS (GPS1) proper motion catalog (Tian+, 2017)
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 2017ApJS..232....4T (SIMBAD/NED BibCode)
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 mr∼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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
gps1.sam 481 1000 Gaia-PS1-SDSS (GPS1) proper motion catalog,
sample output (on a total of 345,274,875 sources)
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/312 : PPMX Catalog of positions and proper motions (Roeser+ 2008)
I/317 : The PPMXL Catalog (Roeser+ 2010)
I/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)
J/AJ/127/3034 : Proper-motion catalog combining USNO-B and SDSS (Munn+, 2004)
J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)
http://dc.zah.uni-heidelberg.de/gps1/q/cone/info : The GPS1 catalog on GAVO
Byte-by-byte Description of file: gps1.sam
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Bytes Format Units Label Explanations
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1- 13 F13.9 deg RAdeg Right ascension from fit
(ICRS, Epoch 2010) (1)
15- 27 F13.9 deg DEdeg Declination from fit (ICRS, Epoch 2010) (1)
29- 48 I20 --- objid Object identifier (not unique; this is not
the Pan-STARRS1 identifier) (2)
50- 55 F6.3 mas e_RAdeg [0.01/100]? Error in RA from Gaia DR1 (1)
57- 62 F6.3 mas e_DEdeg [0.02/100]? Error in DEC from Gaia DR1 (1)
64- 76 F13.9 deg RAPdeg Right Ascension from Pan-STARRS1
78- 90 F13.9 deg DEPdeg Declination from Pan-STARRS1
92-104 F13.3 mas/yr pmRA Proper motion in RA with cos(δ)
applied; robust fit
106-116 F11.3 mas/yr e_pmRA [0.006/4865976] Error of proper motion
in RA, cos(δ) applied; robust fit (3)
118-127 F10.3 mas/yr pmDE Proper motion in Declination; robust fit
129-140 F12.3 mas/yr e_pmDE Error of proper motion in Declination;
robust fit (3)
142-154 F13.3 mas/yr pmRAx Proper motion in RA with cos(δ)
applied; x-validation fit
156-166 F11.3 mas/yr e_pmRAx [0.1/4865976]? Error of proper motion in RA,
cos(δ) applied; x-validation fit (3)
168-177 F10.3 mas/yr pmDEx Proper motion in Declination;
x-validation fit
179-190 F12.3 mas/yr e_pmDEx ? Error of proper motion in Declination;
x-validation fit (3)
192-204 F13.3 mas/yr pmRAng Proper motion in RA with cos(δ)
applied; fit without Gaia
206-217 F12.3 mas/yr e_pmRAng ? Error of proper motion in RA, cos(δ)
applied; fit without Gaia (3)
219-229 F11.3 mas/yr pmDEng [-185001/30992] Proper motion in DEC;
fit without Gaia
231-242 F12.3 mas/yr e_pmDEng ? Error of proper motion in Declination;
fit without Gaia (3)
244-256 F13.3 mas/yr pmRAps Proper motion in RA with cos(δ)
applied; fit with only Pan-STARRS
258-269 F12.3 mas/yr e_pmRAps ? Error of proper motion in RA, cos(δ)
applied; fit with only Pan-STARRS (3)
271-280 F10.3 mas/yr pmDEps [-85810/11545] Proper motion in Declination;
fit with only Pan-STARRS
282-293 F12.3 mas/yr e_pmDEps Error of proper motion in Declination;
fit with only Pan-STARRS (3)
295-303 E9.3 --- chi2pmRA Reduced Χ2 for the robust fit of
proper motion in RA
305-313 E9.3 --- chi2pmDE Reduced Χ2 for the robust fit of
proper motion in DEC
315-323 E9.3 --- chi2pmRAps Reduced Χ2 for the Pan-STARRS 1-only
fit of proper motion in RA
325-333 E9.3 --- chi2pmDEps Reduced Χ2 for the Pan-STARRS 1-only
fit of proper motion in DEC
335-341 F7.3 mag gmag [-33/32]? g-band PSF magnitude from
PAN-STARRS1/PS1 DR1 (4)
343-349 F7.3 mag e_gmag [0/197]? gmag uncertainty
351-356 F6.3 mag rmag [-5/29]? r-band PSF magnitude from
PAN-STARRS1/PS1 DR1 (4)
358-363 F6.3 mag e_rmag [0/85]? rmag uncertainty
365-370 F6.3 mag imag [-3/30]? i-band PSF magnitude from
PAN-STARRS1/PS1 DR1 (4)
372-377 F6.3 mag e_imag [0/77]? imag uncertainty
379-384 F6.3 mag zmag [-0.1/29]? z-band PSF magnitude from
PAN-STARRS1/PS1 DR1 (4)
386-392 F7.3 mag e_zmag [0/151]? zmag uncertainty
394-399 F6.3 mag ymag [-5/27]? y-band PSF magnitude from
PAN-STARRS1/PS1 DR1 (4)
401-407 F7.3 mag e_ymag [0/253]? ymag uncertainty
409-414 F6.3 mag Jmag [0/26]? J-band magnitude from 2MASS (4)
416-420 F5.3 mag e_Jmag [0/10]? Jmag uncertainty
422-427 F6.3 mag Hmag [0/25]? H-band magnitude from 2MASS (4)
429-433 F5.3 mag e_Hmag [0/10]? Hmag uncertainty
435-440 F6.3 mag Ksmag [0/21]? Ks-band magnitude from 2MASS (4)
442-446 F5.3 mag e_Ksmag [0/10]? Ksmag uncertainty
448-453 F6.3 mag Gmag [9.7/26.3]? G-band magnitude from Gaia (4)
455-460 F6.4 mag e_Gmag [0.0001/0.5]? Gmag uncertainty
462-463 I2 --- N(PS1) [3/15] Number of PS1 SeasonAVG detections
465-466 I2 --- Nobs [3/16] Number of all the detections
468-469 I2 --- Surveys [0/35] Sum of source codes for the source
catalogues that went into this row (5)
471-475 F5.3 arcsec d(PS1) [0/2] Distance between position in GPS1 and
the associated (closest) position in
Pan-STARRS1 used for (not accounting for
the epoch difference)
477-481 F5.3 arcsec d(G) [0/3] Distance between position in GPS1 and
the associated (closest) position in
Gaia DR1 (not accounting for the epoch
difference)
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Note (1): The positions are SeasonAVGs from Pan-STARRS1 if unavailable
from Gaia DR1. The errors are NULL in these cases.
Note (2): Different items share the same objID, however they are very likely the same object.
Note (3): Note that some values are very large; mostly for sources located at
the Celestial Pole. Objects with errors larger than 1000mas/yr should
be removed.
Note (4): Pan-STARRS1, 2MASS, and Gaia photometry was re-added to the objects
via a blind crossmatch; it does not necessarily correspond to the
photometry of the objects that were used to derive the astrometry, in
particular in crowded fields.
Note (5): Pan-STARRS1 is always present (= 0). Source codes:
5 = 2MASS; 10 = SDSS, 20 = Gaia.
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Acknowledgements:
Markus Demleitner [GAVO] for his help to recover the data;
Bertrand Goldman [Max Planck Institute for Astronomy] for his help
to describe the data.
History:
VO resource provided by the GAVO Data Center
(End) Thomas Boch, Emmanuelle Perret [CDS] 06-Feb-2018