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J/other/RAA/19.29 Compilation of known QSOs for the Gaia mission (Liao+, 2019)
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Beginning of ReadMe :J/other/RAA/19.29 Compilation of known QSOs for the Gaia mission (Liao+, 2019)
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A compilation of known QSOs for the Gaia mission.
Liao S.-L., Qi Z.-x., Guo S.-f., Cao Z.-h.
<Res. Astron. Astrophys., 19, 29 (2019)>
=2019RAA....19...29L (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Photometry, SDSS ; Photometry, infrared ; Redshifts
Keywords: astrometry - catalogs - quasars - astrometric - parallax bias -
Gaia catalog
Abstract:
Quasars are essential for astrometric in the sense that they are
spatial stationary because of their large distance from the Sun. The
European Space Agency (ESA) space astrometric satellite Gaia is
scanning the whole sky with unprecedented accuracy up to a few uas
level. However, Gaia's two fields of view observations strategy may
introduce a parallax bias in the Gaia catalog. Since it presents no
significant parallax, quasar is perfect nature object to detect such
bias. More importantly, quasars can be used to construct a Celestial
Reference Frame in the optical wavelengths in Gaia mission. In this
paper, we compile the most reliable quasars existing in
literatures.The final compilation (designated as Known Quasars Catalog
for Gaia mission, KQCG) contains 1842076 objects, among of them,
797632 objects are found in Gaia DR1 after cross-identifications. This
catalog will be very useful in Gaia mission.
Description:
KQCG (Known QSOs catalog for Gaia mission) is a compilation of quasars
from LQAC3, SDSS DRQ14, LAMOST DR5 and MIRAGNs from AllWISE. This
catalog convers the whole sky, and contains 1842076 objects. KQCG can
be used in the Gaia mission in the following three aspects: 1) They
can be selected to build the Gaia celestial reference frame. With such
a large number of QSOs and uniform spatial distribution, one can
statistics analysis the overall properties of this new Celestial
Reference Frame with respect to their spatial distribution, accuracy,
magnitude distribution. 2). As the parallaxes and the proper motions
of the QSOs can be treated as zero, they can be used to detect the
parallax bias of the Gaia catalog and as additional quality indicators
to evaluate the overall quality of the Gaia catalog. 3). A comparison
of those QSOs in radio wavelength with optical counterparts can be
made between the Gaia solution and the VLBI solution. More
importantly, these QSOs in radio wavelength with optical counterparts
can be used to link the ICRF between the radio and optical band.