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Table 5.
Mass estimates for NGC 5257 and NGC 5258.
| Inside R = 0.37 D25/2 | NGC 5257 | NGC 5258 | |
|---|---|---|---|
| R = 0.37 D25/2 in arcsec (kpc) | 20.0 (9.70) | 18.4 (8.94) | |
| V at 0.37 D25/2 (km s−1) | 270 | 290 | |
| Dynamical mass (1011 M⊙) | 0.9−1.6a | 1.5−2.5a | |
| 1.48b | 1.02b | ||
| Mdisc | 0.358 | 0.238 | |
| Mhalo | 1.12 | 0.779 | |
| Mass ratio (MNGC 5257/MNGC 5258) | 0.5−1.6a | ||
| 1.45b | |||
| Inside furthest HI point on RC | NGC 5257 | NGC 5258 | |
| before velocity decrease, RHI | |||
| Rmax in arcsec | 20.0 (0.38 D25/2) | 38.0 (0.72 D25/2) | |
| V at RHI (km s−1) | 270 | 250 | |
| Dynamical mass (1011 M⊙) | 0.9−1.6a | 1.6−2.7a | |
| 1.48b | 2.87b | ||
| Mdisc | 0.358 | 0.406 | |
| Mhalo | 1.12 | 2.46 | |
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