Aurigaia: mock Gaia DR2 stellar catalogues from the Auriga cosmological simulations
Robert J. J. Grand, John Helly, Azadeh Fattahi, Marius Cautun, Shaun, Cole, Andrew P. Cooper, Alis J. Deason, Carlos Frenk, Facundo A. G\'omez,, Jason A. S. Hunt, Federico Marinacci, R\"udiger Pakmor, Christine M. Simpson,, Volker Springel, Dandan Xu

TL;DR
This paper introduces mock Gaia DR2 stellar catalogues derived from high-resolution cosmological simulations of Milky Way-like galaxies, enabling detailed comparison between models and actual Gaia data for galaxy formation studies.
Contribution
The authors provide publicly available mock Gaia DR2 catalogues based on six high-resolution AURIGA simulations, using two methods to preserve phase-space distribution and include comprehensive stellar data.
Findings
Detection of a flared young stellar disc up to 15 kpc radius.
Accurate measurement of stellar halo spin out to 100 kpc using RR Lyrae stars.
The catalogues facilitate testing analysis methods and interpreting Gaia data in galaxy formation context.
Abstract
We present and analyse mock stellar catalogues that match the selection criteria and observables (including uncertainties) of the Gaia satellite data release 2 (DR2). The source are six cosmological high-resolution magneto-hydrodynamic CDM zoom simulations of the formation of Milky Way analogues from the AURIGA project. Mock data are provided for stars with mag, and mag at degrees. The mock catalogues are made using two different methods: the public SNAPDRAGONS code, and a method based on that of Lowing et al. that preserves the phase-space distribution of the model stars. These publicly available catalogues contain 5-parameter astrometry, radial velocities, multi-band photometry, stellar parameters, dust extinction values, and uncertainties in all these quantities. In addition, we provide the gravitational potential and information on the origin of…
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