Table 1
Properties of the Galactic atomic and molecular hydrogen averaged in the region 3 <R < 8.3 kpc.
| Par. | Units | H I | H2 |
|
|
|||
| σ | km s-1 | 8.9 ± 1.1 ± 1.5 | 4.4 ± 1.2 ± 1.5 |
| n 0 | cm-3 | 0.43 ± 0.11 ± 0.10 | 0.42 ± 0.22 ± 0.21 |
| h s | pc | 202 ± 28 ± 21 | 64 ± 12 ± 32 |
| Σ | M⊙ pc-2 | 4.5 ± 1.1 ± 1.6 | 3.0 ± 1.9 ± 2.0 |
|
|
|||
| MH( <R⊙) | 108M⊙ | 9.0 ± 0.5 | 6.7 ± 0.7 |
Notes. σ: velocity dispersion; n0: midplane density; hs: HWHM scale height; Σ: face-on surface density. Each entry shows the mean value computed in the region considered, followed by its standard deviation and by the mean uncertainty associated to the measurements. Scale heights are derived assuming Gaussian profiles for the vertical distribution of the gas. The last row shows the total H I and H2 masses within the solar circle, determined as discussed in the text. Masses and densities do not include the contribution from helium.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.