Table 1.
The sample and some of its properties.
| ID | r25 | PA | cz | d | vc |
zc1 | Disc structure | |
|---|---|---|---|---|---|---|---|---|
| H I data | This paper | |||||||
| (″) | (°) | (km s−1) | (Mpc) | (km s−1) | (km s−1) | (″) | ||
| ESO 157-49 | 52.1 | 30.4 | 1656 | 17.3 | 99 | 107 | 6.1 | Well defined thin and thick disc |
| ESO 443-21 | 36.9 | 160.8 | 2819 | 52.2 | 164 | 196 | − | No distinct thin and thick disc |
| ESO 469-15 | 55.9 | 149.2 | 1636 | 28.3 | 104 | 83 | 4.8 | Well defined thin and thick disc |
| ESO 544-27 | 46.5 | 153.3 | 2454 | 45.9 | 125 | 129 | 4.0 | Well defined thin and thick disc |
| IC 217 | 59.9 | 35.7 | 1890 | 21.1 | 104 | 115 | 5.4 | Well defined thin and thick disc |
| IC 1553 | 40.5 | 15.0 | 2905 | 36.5 | 128 | 142 | 5.0 | Well defined thin and thick disc |
| PGC 28308 | 59.9 | 125.2 | 2719 | 43.1 | 180 | 130 | − | Well defined thin and thick disc; the |
| thin disc dominates at all heights | ||||||||
| PGC 30591 | 45.4 | 169.2 | 2028 | 35.5 | 122 | 97 | − | No distinct thin and thick disc |
Notes. Position angle (PA) values from Salo et al. (2015). Heliocentric recession velocities (cz) from the NED except for ESO 157-49 and IC 1553 where we estimated cz by making the amplitude of the stellar rotation curve in the midplane roughly similar for the approaching and the receding sides. Distance estimates (d) from Tully et al. (2008, 2016). H I circular velocity values (vc) from Mathewson & Ford (1996), Theureau et al. (2006), and Courtois et al. (2009). The vc values as estimated in this paper come from fitting Eq. (2) to the midplane line emission curves extracted from the maps in Figs. A.1–A.8 (see also Fig. 2). The heights above which the thick disc dominates in S4G images (zc1) are from Comerón et al. (2018) and so are the disc structure descriptions.
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