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Using Gaia as an Astrometric Tool for Deep Ground-based Surveys

Published online by Cambridge University Press:  07 March 2018

Dana I. Casetti-Dinescu Open the ORCID record for Dana I. Casetti-Dinescu [Opens in a new window] ,
Terrence M. Girard  and
Michael Schriefer
Dana I. Casetti-Dinescu
Affiliation:
Southern Connecticut State University, 501 Crescent Street, New Haven, CT, USA email: [email protected]
Terrence M. Girard
Affiliation:
14 Dunn Road, Hamden, CT 06518, USA email: [email protected]
Michael Schriefer
Affiliation:
Southern Connecticut State University, 501 Crescent Street, New Haven, CT, USA email: [email protected]
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Abstract

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Gaia DR1 positions are used to astrometrically calibrate three epochs’ worth of Subaru SuprimeCam images in the fields of globular cluster NGC 2419 and the Sextans dwarf spheroidal galaxy. Distortion-correction “maps” are constructed from a combination of offset dithers and reference to Gaia DR1. These are used to derive absolute proper motions in the field of NGC 2419. Notably, we identify the photometrically-detected Monoceros structure in the foreground of NGC 2419 as a kinematically-cold population of stars, distinct from Galactic-field stars. This project demonstrates the feasibility of combining Gaia with deep, ground-based surveys, thus extending high-quality astrometry to magnitudes beyond the limits of Gaia.

Keywords

astrometryGalaxy: kinematics and dynamicsgalaxies: dwarf
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 85 - 87
Copyright
Copyright © International Astronomical Union 2018 

References

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Gaia Collaboration et al., 2016, A&A, 595, 1 Google Scholar