Table 3.
M31 and M33: stellar-population emission parameters.
| Galaxy | f12 μm | f25 μm | f60 μm | f100 μm | TIR | Topt |
|---|---|---|---|---|---|---|
| Jy | Jy | Jy | Jy | K | K | |
| M31 (a) | 170 | 220 | 690 | 3800 | 29 | 2900 |
| M33 (b) | 33 | 40 | 420 | 1260 | 30 | 3000 |
Notes.
IRAS flux densities from Habing et al. (1984). Temperatures TIR and Topt estimated using Wien law from the IR peak at 160 μm (Montalto et al. 2009; Viaene et al. 2014) and the optical peak at 1 μm (Viaene et al. 2014).
IRAS flux densities from Rice et al. (1990). Temperatures TIR and Topt estimated using Wien law from the IR peak at 100 μm and the optical peak at 1.1 μm (Rice et al. 1990).
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