Spitzer 70~$μ$m Emission as a SFR Indicator for Sub--Galactic Regions

Yiming Li; Daniela Calzetti; Robert C. Kennicutt,; Sungryong Hong; Charles W. Engelbracht; Daniel A Dale; John Moustakas

doi:10.1088/0004-637X/725/1/677

paper

Spitzer 70~ $μ$ m Emission as a SFR Indicator for Sub--Galactic Regions

arXiv:1010.0373 · doi:10.1088/0004-637X/725/1/677

Abstract

We use Spitzer 24 $μ$ m, 70 $μ$ m and ground based H $α$ data for a sample of 40 SINGS galaxies to establish a star formation rate (SFR) indicator using 70 $μ$ m emission for sub--galactic ( $\sim 0.05 - 2 kpc$ ) line-emitting regions and to investigate limits in application. A linear correlation between 70 $μ$ m and SFR is found and a star formation indicator SFR(70) is proposed for line-emitting sub-galactic regions as $Σ (SFR) (M_{⊙} \cdot y r^{- 1} \cdot kp c^{- 2}) = 9.4 \times 1 0^{- 44} Σ (70) (ergs \cdot s^{- 1} \cdot kp c^{- 2})$ , for regions with $12 + log (O/H) ≳ 8.4$ and $Σ (SFR) ≳ 1 0^{- 3} (M_{⊙} \cdot y r^{- 1} \cdot kp c^{- 2})$ , with a 1- $σ$ dispersion around the calibration of $\sim 0.16$ dex. We also discuss the influence of metallicity on the scatter of the data. Comparing with the SFR indicator at 70 $μ$ m for integrated light from galaxies, we find that there is $\sim 40$ excess 70 $μ$ m emission in galaxies, which can be attributed to stellar populations not involved in the current star formation activity.

36 pages, 1 table, 18 figures, accepted by ApJ

Spitzer 70~ $μ$ m Emission as a SFR Indicator for Sub--Galactic Regions

Abstract

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Spitzer 70~μm Emission as a SFR Indicator for Sub--Galactic Regions

Abstract

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Cited by in corpus (28)

Spitzer 70~ $μ$ m Emission as a SFR Indicator for Sub--Galactic Regions