Table 3
Basic data for I Zw 18.
| Parameter | Valuea | Referenceb |
|
|
||
| V hel | 751 km s-1 | (1) |
| Distance | 18.2 Mpc (1′′ = 88 pc) | (2) |
| 12 + log (O/H) | 7.17 (NW) − 7.18 (SE) | (3) |
| M stars | 1.34 × 106 M⊙ | (4) |
| SFR | 0.17 M⊙ yr-1 | (5) |
| ΣSFRc | 0.19 M⊙ yr-1 kpc-2 | This paper |
| M H I | 1.0 × 108 M⊙ | (6) |
| ⟨ ΣH I ⟩ | 64 M⊙ pc-2 | (6) |
| Peak ΣH I | 100 M⊙ pc-2 | (6) |
| L dust d | (2.00 ± 0.07) × 107 L⊙ | This paper |
| M dust | (3.4 ± 1.0) × 102 M⊙ | This paper |
Notes.
Luminosity and mass values taken from the literature have been scaled to the distance of D = 18.2 Mpc.
(1) NASA/IPAC Extragalactic Database (NED); (2) Aloisi et al. (2007); (3) Izotov et al. (1999); (4) Fumagalli et al. (2010); (5) Hunt et al. (2005b); (6) Lelli et al. (2012).
Obtained by considering an area of 0.88 kpc2, corresponding to a circular aperture 6′′ (~530 pc) in radius.
Obtained by integrating the SED model described in Sect. 4.
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