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Table 1.
Dynamical masses determined for the Cen A group (excluding the M83 subgroup).
| Method | Mtot | Radius | Ref. |
|---|---|---|---|
| 1012 M⊙ | kpc | ||
| Rotating plane | 2.0 ± 0.4 | R1/2 = 130 | 1 |
| Virial theorem | 1.6 ± 0.4 | R1/2 = 130 | 1 |
| Rotating plane | 5.3 ± 3.5 | R200 = 344 | 1 |
| Virial theorem | ∼8 | ∼400 | 2 |
| Rotating plane | 7.5 ± 5.0 | R100 = 487 | 1 |
| Virial theorem | ∼12 | ∼600 | 3 |
| Rotating sphere | 8.6 ± 2.8 | ∼760 | 4 |
| Rotating plane | 12.4 ± 5.5 | Rmax = 800 | 1 |
| Zero-Velocity surface | ∼6 | ∼1400 | 2 |
Notes. Literature values were rescaled to a distance of 3.68 Mpc (Tully et al. 2015).
References. (1) This work; (2) Karachentsev et al. (2007); (3) van den Bergh (2000); and (4) Woodley (2006).
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