Table 1.
Parameters of Fornax, its GCs, the MW, and the observing frame.
| Parameter | Value | Note |
|---|---|---|
| Fornax | ||
| Heliocentric distance | 143 kpc | (1) |
| Angular scale | 24′/kpc, 2.5 kpc/° | |
| Stellar mass | 3×107 M⊙ | (2) |
| Right ascension | 2h39m50.9s | (3) |
| Declination | −34°30′54″ | (3) |
| Sérsic index | 0.8 | (3) |
| Effective radius | 0.75 kpc | (3) |
| Heliocentric proper motion μαcos(δ) | 0.381 mas yr−1 | (4) |
| Heliocentric proper motion μδ | −0.358 mas yr−1 | (4) |
| Heliocentric radial velocity | 55.3 km s−1 | (5) |
| GCs of Fornax | ||
| Names | Fornax(1, 2, 3, 4, 5) | |
| Stellar masses | (0.4, 1.5, 5.0, 0.8, 1.9) ×105 M⊙ | (6) |
| Projected distances | (1.67, 0.93, 0.64, 0.15, 1.65) kpc | (7) |
| Milky Way | ||
| Stellar mass | 6×1010 M⊙ | (8) |
| Observing frame | ||
| Galactic center position | [8.27, 0, 0] kpc | (9) |
| Galactic center velocity | [−9.3, −251.5, −8.59] km s−1 | (9) |
Notes. (1) Oakes et al. (2022). (2) Intermediate value between McConnachie (2012) (stellar mass obtained from the V-band luminosity by assuming the mass-to-light ratio of one) and de Boer et al. (2012) (from a stellar populations synthesis model). (3) Sample S0 of Yang et al. (2022), effective radius converted from the provided Sérsic radius. (4) Battaglia et al. (2022). (5) McConnachie (2012). (6) de Boer & Fraser (2016). (7) Calculated from the coordinates of the GCs by Mackey & Gilmore (2003) and the coordinates and distance of Fornax given above. The distances differ from those given by Mackey & Gilmore (2003) because a different center of Fornax is used. (8) Zhao et al. (2013). (9) GRAVITY Collaboration (2022), Gaia Collaboration (2023). Cartesian coordinates with the center at position of the Sun assumed. The x-axis points toward the Galactic center, the y-axis in the direction of the motion of the Sun, and the z-axis forms a right-handed coordinate system with the other two axes.
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