Table 2
Fraction of thick to total disk mass at different radii and distances from the disk midplane.
| Inner disk | Near the solar radius | Outer disk | |
| 4 <r< 8 kpc | 7.9 <r< 8.1 kpc | 8 <r< 15 kpc | |
|
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| Chemistry-defined thick disk: fr[Mg/Fe]>0.2, σz,thin [km s-1], σz,thck [km s-1] | |||
|
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| | z | < 0.1 kpc | 0.14, 25, 53 | 0.14, 20, 36 | 0.13, 16, 33 |
| | z | < 0.5 kpc | 0.20, 30, 54 | 0.16, 22, 43 | 0.16, 17, 34 |
| | z | < 1.0 kpc | 0.26, 32, 56 | 0.22, 23, 42 | 0.19, 19, 35 |
| | z | < 3.0 kpc | 0.30, 35, 58 | 0.27, 25, 48 | 0.25, 20, 40 |
|
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| Age-defined thick disk: frage>9, σz,thin [km s-1], σz,thck [km s-1] | |||
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| | z | < 0.1 kpc | 0.18, 22, 54 | 0.14, 19, 38 | 0.09, 16, 40 |
| | z | < 0.5 kpc | 0.27, 26, 55 | 0.16, 20, 46 | 0.11, 17, 41 |
| | z | < 1.0 kpc | 0.34, 28, 56 | 0.22, 21, 45 | 0.14, 18, 42 |
| | z | < 3.0 kpc | 0.41, 29, 58 | 0.28, 22, 50 | 0.20, 19, 45 |
Notes. Two ways of defining the thick disk are used: by chemistry ([α/Fe] < 0.2 dex) and by age (age >9 Gyr). For each spatial region and thick disk definition three values are given: the aforementioned fraction (fr[Mg/Fe]>0.2 or frage>9), the vertical velocity dispersion of the thin disk (σz,thin), and the vertical velocity dispersion of the thick disk (σz,thick).
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