SIMBAD references

We use Spitzer 24 µm, 70 µm and ground-based Hα data for a sample of 40 SINGS galaxies to establish a star formation rate (SFR) indicator using 70 µm emission for sub-galactic (∼0.05-2 kpc) line-emitting regions and to investigate limits in application. A linear correlation between 70 µm and SFR is found and a star formation indicator SFR(70) is proposed for line-emitting sub-galactic regions as Σ(SFR)(M_☉/yr/kpc2 ) = 9.4x10^–44 Σ(70)(erg/s/kpc2), for regions with 12 + log(O/H) ≳ 8.4 and Σ(SFR) ≳ 10^–3(M_☉/yr/kpc2), with a 1σ dispersion around the calibration of ∼0.16 dex. We also discuss the influence of metallicity on the scatter of the data. Comparing with the SFR indicator at 70 µm for integrated light from galaxies, we find that there is ∼40% excess 70 µm emission in galaxies, which can be attributed to stellar populations not involved in the current star formation activity.