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Title:
The size and shape of the Milky Way disc and halo from M-type brown dwarfs in the BoRG survey
Authors:
van Vledder, Isabel; van der Vlugt, Dieuwertje; Holwerda, B. W.; Kenworthy, M. A.; Bouwens, R. J.; Trenti, M.
Affiliation:
AA(University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands; ), AB(University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands), AC(University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands), AD(University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands), AE(University of Leiden, Sterrenwacht Leiden, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands), AF(School of Physics, University of Melbourne, VIC 3010, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 1, p.425-437 (MNRAS Homepage)
Publication Date:
05/2016
Origin:
OUP
Astronomy Keywords:
techniques: photometric, stars: low-mass, stars: luminosity function, mass function, Galaxy: disc, Galaxy: halo, Galaxy: stellar content
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw258
Bibliographic Code:
2016MNRAS.458..425V

Abstract

We have identified 274 M-type brown dwarfs in the Hubble Space Telescope's Wide Field Camera 3 pure parallel fields from the Brightest of Reionizing Galaxies (BoRG) survey for high-redshift galaxies. These are near-infrared observations with multiple lines of sight out of our Milky Way. Using these observed M-type brown dwarfs, we fitted a Galactic disc and halo model with a Markov chain Monte Carlo analysis. This model worked best with the scalelength of the disc fixed at h = 2.6 kpc. For the scaleheight of the disc, we found z_0 = 0.29^{+0.02}_{-0.019} kpc and for the central number density, rho _0 = 0.29^{+0.20}_{-0.13} # pc-3. For the halo, we derived a flattening parameter kappa = 0.45 ± 0.04 and a power-law index p = 2.4 ± 0.07. We found the fraction of M-type brown dwarfs in the local density that belong to the halo to be fh = 0.0075^{+0.0025}_{-0.0019}. We found no correlation between subtype of M-dwarf and any model parameters. The total number of M-type brown dwarfs in the disc and halo was determined to be 58.2^{+9.81}_{-6.70} × 109. We found an upper limit for the fraction of M-type brown dwarfs in the halo of 7^{+5}_{-4} per cent. The upper limit for the total Galactic disc mass in M-dwarfs is 4.34^{+0.73}_{-0.5}× 109 M&sun;, assuming all M-type brown dwarfs have a mass of 80 MJ.
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