SIMBAD references

2019MNRAS.485.2010G - Mon. Not. R. Astron. Soc., 485, 2010-2025 (2019/May-2)

Kinematics of the Tucana Dwarf Galaxy: an unusually dense dwarf in the Local Group.

GREGORY A.L., COLLINS M.L.M., READ J.I., IRWIN M.J., IBATA R.A., MARTIN N.F., McCONNACHIE A.W. and WEISZ D.R.

Abstract (from CDS):

We present new FLAMES+GIRAFFE spectroscopy of 36 member stars in the isolated Local Group dwarf spheroidal galaxy Tucana. We measure a systemic velocity for the system of vTuc = 216.7–2.8+2.9 km s–1, and a velocity dispersion of σv,Tuc = 14.4–2.3+2.8 km s–1. We also detect a rotation gradient of d/vr dχ= 7.6+4.2–4.3 km s–1 kpc–1, which reduces the systemic velocity to vTuc = 215.2–2.7+2.8 km s–1 and the velocity dispersion to σv,Tuc = 13.3–2.3+2.7 km s–1. We perform Jeans modelling of the density profile of Tucana, using the line-of-sight velocities of the member stars. We find that it favours a high central density consistent with 'pristine' subhaloes in Λ cold dark matter, and a massive dark matter halo (∼1010 M) consistent with expectations from abundance matching. Tucana appears to be significantly more centrally dense than other isolated Local Group dwarfs, making it an ideal laboratory for testing dark matter models.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: haloes - galaxies: kinematics and dynamics - Local Group

Status in Simbad:  waiting for electronic table

Simbad objects: 19

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2019.10.22-17:11:31

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