2018A&A...616L...9M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:20:43

2018A&A...616L...9M - Astronomy and Astrophysics, volume 616, L9-9 (2018/8-1)

The escape speed curve of the Galaxy obtained from Gaia DR2 implies a heavy Milky Way.

MONARI G., FAMAEY B., CARRILLO I., PIFFL T., STEINMETZ M., WYSE R.F.G., ANDERS F., CHIAPPINI C. and JANSSEN K.

Abstract (from CDS):

We measure the escape speed curve of the Milky Way based on the analysis of the velocity distribution of ∼2850 counter-rotating halo stars from the Gaia Data Release 2. The distances were estimated through the StarHorse code, and only stars with distance errors smaller than 10% were used in the study. The escape speed curve is measured at Galactocentric radii ranging from ∼5kpc to ∼10.5kpc. The local Galactic escape at the Sun's position is estimated to be ve(r)=580±63km/s, and it rises towards the Galactic centre. Defined as the minimum speed required to reach three virial radii, our estimate of the escape speed as a function of radius implies for a Navarro-Frenk-White profile and local circular velocity of 240km/s a dark matter mass M200=1.28–0.50+0.68x1012M and a high concentration c200=11.09–1.79+2.94. Assuming the mass-concentration relation of ΛCDM, we obtain M200=1.55–0.51+0.64x1012M and c200=7.93–0.27+0.33 for a local circular velocity of 228km/s.

Abstract Copyright: © ESO 2018

Journal keyword(s): Galaxy: kinematics and dynamics - Galaxy: fundamental parameters

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10903 1
2 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
3 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-02:20:43

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