Free Access

Table 1

Disc parameters of the best fit (see text).

Parameter All data, no grad. metal. | φ | ≤ 30°, no grad. metal. All data, with grad. metal.

hr,thin (kpc) 2.1 2.0
hz,thin(R) (kpc) 0.28 0.21
hr,thick (kpc) 2.5 2.7
hz,thick(R) (kpc) 0.60 0.55

k1,thin (kpc-1) –0.037 0.090 –0.190
k2,thin (kpc-2) 0.052 0.043 0.070
k1,thick (kpc-1) 0.021 1.448 0.000
k2,thick (kpc-2) 0.006 –0.055 0.010
Rft (kpc) 15.8 6.9

hz,thin(15 kpc) /hz,thin(R) 3.3 3.7 3.1
hz,thin(20 kpc) /hz,thin(R) 8.1 8.3 8.8
hz,thin(25 kpc) /hz,thin(R) 15.5 14.9 17.8
hz,thick(15 kpc) /hz,thick(R) 1.5 1.0 1.6
hz,thick(20 kpc) /hz,thin(R) 2.3 6.1 2.7
hz,thick(25 kpc) /hz,thick(R) 3.4 9.6 4.2

Notes. There are nine independent parameters in the fit; the last six parameters depend on the previous ones. The constraint | φ | ≤ 30° explores the region where the warp amplitude is very low. The metallicity gradient is modelled following Eq. (6).

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.