Journal article
Dynamical model of the Milky Way using APOGEE and Gaia data
- Abstract:
- We construct a dynamical model of the Milky Way disk from a data set that combines Gaia EDR3 and APOGEE data throughout galactocentric radii in the range 5.0 kpc ≤ R ≤ 19.5 kpc. We make use of the spherically aligned Jeans anisotropic method to model the stellar velocities and their velocity dispersions. Building upon our previous work, our model is now fitted to kinematic maps that have been extended to larger galactocentric radii due to the expansion of our data set, probing the outer regions of the Galactic disk. Our best-fitting dynamical model suggests a logarithmic density slope of αDM = −1.602 ± 0.079syst for the dark matter halo and a dark matter density of ρDM(R⊙) = (8.92 ± 0.56syst) × 10−3 M⊙ pc−3 (0.339 ± 0.022syst GeV cm3). We estimate a circular velocity at the solar radius of vcirc = (234.7 ± 1.7syst) km s−1 with a decline toward larger radii. The total mass density is ρtot(R⊙) = (0.0672 ± 0.0015syst) M⊙ pc−3 with a slope of αtot = −2.367 ± 0.047syst for 5 kpc ≤ R ≤ 19.5 kpc, and the total surface density is Σ(R⊙, ∣z∣ ≤ 1.1 kpc) = (55.5 ± 1.7syst) M⊙ pc−2. While the statistical errors are small, the error budget of the derived quantities is dominated by the three to seven times larger systematic uncertainties. These values are consistent with our previous determination, but the systematic uncertainties are reduced due to the extended data set covering a larger spatial extent of the Milky Way disk. Furthermore, we test the influence of nonaxisymmetric features on our resulting model and analyze how a flaring disk model would change our findings.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 2.6MB, Terms of use)
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- Publisher copy:
- 10.3847/1538-4357/ac04b5
Authors
- Publisher:
- IOP Publishing
- Journal:
- Astrophysical Journal More from this journal
- Volume:
- 916
- Issue:
- 2
- Article number:
- 112
- Publication date:
- 2021-08-04
- Acceptance date:
- 2021-05-20
- DOI:
- EISSN:
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1538-4357
- ISSN:
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0004-637X
- Language:
-
English
- Keywords:
- Pubs id:
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1183243
- Local pid:
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pubs:1183243
- Deposit date:
-
2021-06-25
Terms of use
- Copyright holder:
- Nitschai et al.
- Copyright date:
- 2021
- Rights statement:
- © 2021. The Author(s). Published by the American Astronomical Society. Open Access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
- Licence:
- CC Attribution (CC BY)
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