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Determining the Local Dark Matter Density with SDSS G-dwarf data

Published online by Cambridge University Press:  07 March 2018

Hamish Silverwood Open the ORCID record for Hamish Silverwood [Opens in a new window] ,
Sofia Sivertsson ,
Justin Read ,
Gianfranco Bertone  and
Pascal Steger
Hamish Silverwood
Affiliation:
Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Martì Franquès 1, E08028 Barcelona, Spain email hamish.silverwood@icc.ub.edu
Sofia Sivertsson
Affiliation:
The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, SE-106 91Stockholm, Sweden
Justin Read
Affiliation:
Department of Physics, University of Surrey, Guildford, GU2 7XH, Surrey, UK
Gianfranco Bertone
Affiliation:
GRAPPA, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
Pascal Steger
Affiliation:
Institute for Astronomy, Department of Physics, ETH Zürich, Wolfgang-Pauli-Strasse 27, CH-8093 Zürich, Switzerland
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Abstract

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We present a determination of the local dark matter density derived using the integrated Jeans equation method presented in Silverwood et al. (2016) applied to SDSS-SEGUE G-dwarf data processed by Büdenbender et al. (2015). For our analysis we construct models for the tracer density, dark matter and baryon distribution, and tilt term (linking radial and vertical motions), and then calculate the vertical velocity dispersion using the integrated Jeans equation. These models are then fit to the data using MultiNest, and a posterior distribution for the local dark matter density is derived. We find the most reliable determination to come from the α-young population presented in Büdenbender et al. (2015), yielding a result of ρDM = 0.46+0.07−0.09 GeV cm−3 = 0.012+0.001−0.002 M⊙ pc−3. Our results also illuminate the path ahead for future analyses using Gaia DR2 data, highlighting which quantities will need to be determined and which assumptions could be relaxed.

Keywords

dark matterGalaxy: kinematics and dynamicsGalaxy: disketc
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 255 - 258
Copyright
Copyright © International Astronomical Union 2018 

References

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