The uncertainty in Galactic parameters

By P. McMillan, J. Binney. 2009

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We reanalyse the measurements of parallax, proper motion and line-of-sight velocity for 18 masers in high-mass star-forming regions presented by Reid et al. We use a likelihood analysis to investigate the distance of the Sun from the Galactic Centre, R o , the rotational speed of the local standard of rest, v 0 , and the peculiar velocity of the Sun, v ⊙ , for various models of the rotation curve and models which allow for a typical peculiar motion of the high-mass star-forming regions. We find that these data are best fit by models with non-standard values for v ⊙ or a net peculiar motion of the high-mass star-forming regions. We argue that a correction to v ⊙ is much more likely and these data support the conclusion of Binney that V ⊙ should be revised upwards from 5.2 to 11 km s ―1 . We find that the values of R o and v 0 that we determine are heavily dependent on the model we use for rotation curve, with model-dependent estimates of R 0 ranging from 6.7 ± 0.5 to 8.9 ± 0.9 kpc, and those of v 0 ranging from 200 ± 20 to 279 ± 33 km s ―1 . We argue that these data cannot be thought of as implying any particular values of R o or v 0 . However, we find that v 0 /R 0 is better constrained, lying in the range 29.9 -31.6 km s ―1 kpc ―1 for all models but one.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/fc071ff9a592beee6022753519bca22ea4d550a0

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Citations in the corpus

Local stellar kinematics from RAVE data - I. Local standard of rest (2010, background): “This higher value of V⊙ has been confirmed by Reid et al. (2009) and Rygl et al. (2010) in their works related to radio frequency astrometry of masers in regions of massive star formation (though see McMillan & Binney (2010) for a different analysis).”
The mass distribution and gravitational potential of the Milky Way (2016, methodology): “They have therefore been used by numerous authors to constrain the properties of the Milky Way (e.g.,Reid et al. 2009a; McMillan & Binney 2010; Bovy et al. 2009; Bobylev & Bajkova 2013; Reid et al. 2014, Paper I).”
Directional detection of dark matter with two-dimensional targets (2016, methodology): “We assume the Standard Halo Model (SHM) [38] for g(v), with v0 220 km/s [39] and vesc 550 km/s [40]”
THE MILKY WAY'S CIRCULAR-VELOCITY CURVE BETWEEN 4 AND 14 kpc FROM APOGEE DATA (2012, background): “This offset cannot be explained by the asymmetric drift and it is physically implausible since it requires the masers to have more eccentric orbits than most of the young stars (McMillan & Binney 2010).”
The dark matter density at the Sun’s location (2010, background): “We can also set a lower limit for the disk mass, i.e. βm: first, the microlensing optical depth to Baade’s Window constrains the baryonic matter within the solar circle to be greater than 3.9 × 1010 M (McMillan & Binney 2010).”
ON THE SHOULDERS OF GIANTS: PROPERTIES OF THE STELLAR HALO AND THE MILKY WAY MASS DISTRIBUTION (2014, background): “…0.4 GeV cm−3 (Catena & Ullio 2010; McMillan 2011), the total column densityΣtotal⊙ ≈ 70M⊙ pc−2 (Kuijken & Gilmore 1989c,a,b, 1991; Bovy & Rix 2013; Zhang et al. 2013) and the angular velocity of Sun with respect to galactic centerω⊙ ≈ 30 kms−1 kpc−1 (Reid & Brunthaler 2004; McMillan & Binney 2010).”
CO-EVOLUTION OF GALACTIC NUCLEI AND GLOBULAR CLUSTER SYSTEMS (2013, methodology): “Our simple mass model satisfies basic observational constraints from Launhardt et al. (2002) within 230pc, from McMillan & Binney (2010) at 8kpc, and from Gnedin et al. (2010) out to 80kpc from the Galactic center.”
The 6-GHz methanol multibeam maser catalogue – II. Galactic longitudes 6° to 20° (2010, methodology): “Furthermore we resist adopting the most recently suggested rotation curve and revised LSR suggested by Reid et al. (2009), as it is preliminary and requires revision (McMillan & Binney 2010).”
Constraining the Galaxy's dark halo with RAVE stars (2014, background): “We again assume an intrinsic velocity dispersion of 7 km s−1 and no lag against the circular speed (McMillan & Binney 2010).”
Lectures on Dark Matter Physics (2016, background): “Comparison of constraints on the DM annihilation cross section for the bb̄ (left) and ⌧+⌧ (right) channels from this work with previously published constraints from LAT analysis of the Milky Way halo (3 limit) [34], 112 hours of observations of the Galactic Center with H.E.S.S. [35], and 157.9 hours”
Distribution functions for the Milky Way (2009, background): “Tentative support for such an increase in the V⊙ is provided by astrometry of stellar masers (Reid et al. 2009; McMillan & Binney 2009), and any increase would also tend to bring the Galaxy more into line with the Tully–Fisher relation between vc and MI for external galaxies.”