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Table 6.
Estimated physical properties of the H II region and young stellar population embedded in the headlight cloud in NGC 628.
| Name | Symbol | Value |
|---|---|---|
| Hα luminosity | LHα | 6.3 × 1039 erg s−1 |
| Hα region radius | – | 142 pc |
| Hα linewidth | Δv | ∼50 km s−1 |
| Hα equivalent width | WHα | 517 Å |
| Ionizing photon production rate | Nion | 4.6 × 1051 phot. s−1 |
| Young star mass | Mcl | 3 × 105 M⊙ |
| Young star bolometric luminosity | Lcl | 4 × 108 L⊙ |
| Young star typical age | – | 2 − 4 Myr |
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