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Continuous Mid-Infrared Star Formation Rate Indicators
Battisti, A. J.; Calzetti, D.; Johnson, B. D.; Elbaz, D.
AA(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA ), AB(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA ), AC(Institut d'Astrophysique de Paris, UMR 7095, 75014, Paris, France), AD(Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu, CNRS, Université Paris Diderot, Saclay, pt courrier 131, 91191 Gif-sur-Yvette, France)
Galaxies in 3D across the Universe, Proceedings of the International Astronomical Union, IAU Symposium, Volume 309, pp. 167-168
Publication Date:
galaxies: star formation, infrared: galaxies, stars: formation,
Abstract Copyright:
(c) 2015: Copyright © International Astronomical Union 2015
Bibliographic Code:


We present continuous, monochromatic star formation rate (SFR) indicators over the mid-infrared wavelength range of 6-70 mum. We use a sample of 58 star forming galaxies (SFGs) in the Spitzer-SDSS-GALEX Spectroscopic Survey (SSGSS) at z<0.2, for which there is a rich suite of multi-wavelength photometry and spectroscopy from the ultraviolet through to the infrared. The data from the Spitzer infrared spectrograph (IRS) of these galaxies, which spans 5-40 mum, is anchored to their photometric counterparts. The spectral region between 40-70 mum is interpolated using dust model fits to the IRS spectrum anchored by Spitzer 70 and 160 mum photometry. Since there are no sharp spectral features in this region, we expect these interpolations to be robust. This spectral range is calibrated as a SFR diagnostic using several reference SFR indicators to mitigate potential bias. Our band-specific continuous SFR indicators are found to be consistent with monochromatic calibrations in the local universe, as derived from Spitzer, WISE, and Herschel photometry. Additionally, in the era of the James Webb Space Telescope this will become a flexible tool, applicable to any SFG up to z~3.
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