Table 1
Properties of the best-fitting Model I.
Parameter | Value | Constraint | Value | Derived quantity | Value | |
| ||||||
Observation | Model | |||||
| ||||||
r⊙ (kpc) | 8.40 ± 0.08 | r⊙ (kpc) | 8.33 ± 0.35 | 8.40 | v0 (km s-1) | 242.0 |
Mb (Mgal) | 409 ± 63 | μSgrA∗ (mas yr-1) | −6.379 ± 0.026 | −6.384 | mb (109 M⊙) | 9.5 ± 1.5 |
Md (Mgal) | ![]() | Terminal velocities from H i | See Fig. 1 | See Fig. 1 | md (1010 M⊙) | ![]() |
Mh (Mgal) | ![]() | Terminal velocities from CO | See Fig. 1 | See Fig. 1 | mh (1012 M⊙) | ![]() |
bb (kpc) | 0.23 ± 0.03 | Circular velocities from masers | See Fig. 1 | See Fig. 1 | MR < 50 kpc (1012 M⊙) | ![]() |
ad (kpc) | ![]() | ρ⊙ (M⊙ pc-3), Σ1.1 (M⊙ pc-2) | 0.102 ± 0.010, 74 ± 6 | 0.102, 74 | MR < 100 kpc (1012 M⊙) | ![]() |
bd (kpc) | ![]() | σBW (km s-1) | 117 ± 15 | 120 | MR < 200 kpc (1012 M⊙) | ![]() |
ah (kpc) | ![]() | χ ∗ | ≤0 | 0.66 | vesc, ⊙ (km s-1) | 616.4 |
Λ (kpc) | ![]() | A (km s-1 kpc-1) | 15.06 | |||
γ | 2 (fixed) | B (km s-1 kpc-1) | −13.74 |
Notes.The quoted uncertainties for the model parameters and masses are 90%-confidence limits: After normalizing the weighted via multiplication with a factor yielding
at the minimum
, 90%-confidence intervals are calculated from this normalized χ2 statistics and the condition Δχ2 = 2.71.
The large uncertainties are due to a strong correlation between Mh and ah, see Fig. 3.
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