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Star formation rates of distant luminous infrared galaxies derived from Halpha and IR luminosities

Abstract : We present a study of the star formation rate (SFR) for a sample of 16 distant galaxies detected by ISOCAM at 15 mum in the CFRS0300+00 and CFRS1400+52 fields. Their high quality and intermediate resolution VLT/FORS spectra have allowed a proper correction of the Balmer emission lines from the underlying absorption. Extinction estimates using the Hbeta/Hgamma and the Halpha/Hbeta Balmer decrement are in excellent agreement, providing a robust measurement of the instantaneous SFR based on the extinction-corrected Halpha luminosity. Star formation has also been estimated exploiting the correlations between IR luminosity and those at MIR and radio wavelengths. Our study shows that the relationship between the two SFR estimates follow two distinct regimes: (1) for galaxies with SFR_IR below ˜100 M&sun;/yr, the SFR deduced from Halpha measurements is a good approximation of the global SFR and (2) for galaxies near ULIRG regime. The corrected Halpha SFR understimated the SFR by a factor of 1.5 to 2. Our analyses suggest that heavily extincted regions completely hidden in optical bands (such as those found in Arp 220) contribute less than 20% of the global budget of star formation up to z=1.
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https://hal.archives-ouvertes.fr/hal-03785591
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Submitted on : Thursday, September 29, 2022 - 11:04:45 AM
Last modification on : Thursday, September 29, 2022 - 11:04:46 AM

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Hector Flores, François Hammer, David Elbaz, Catherine J. Cesarsky, Yan-Chun Liang, et al.. Star formation rates of distant luminous infrared galaxies derived from Halpha and IR luminosities. Astronomy and Astrophysics - A&A, 2004, 415, pp.885-888. ⟨10.1051/0004-6361:20034491⟩. ⟨hal-03785591⟩

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