The 0.4 $mathsf{<}$ z $mathsf{<}$ 1.3 star formation history of the Universe as viewed in the far-infrared

摘要

Aims. We use the deepest existing mid- and far-infrared observations (reaching 3mJy at 70m) obtained with Spitzer in the Great Observatories Origins Deep Survey (GOODS) and Far Infrared Deep Extragalactic Legacy survey (FIDEL) fields to derive the evolution of the rest-frame 15m, 35m, and total infrared luminosity functions of galaxies spanning z<1.3. We thereby quantify the fractional contribution of infrared luminous galaxies to the comoving star formation rate density over this redshift range. In comparison with previous studies, the present one takes advantage of deep 70m observations that provide a more robust infrared luminosity indicator than 24m affected by the emission of PAHs at high redshift (), and we use several independent fields to control cosmic variance. Methods. We used a new extraction technique based on the well-determined positions of galaxies at shorter wavelengths to extract the 24 and 70m flux densities of galaxies. It is found that sources separated by a minimum of 0.5FWHM are deblended by this technique, which facilitates multi-wavelength associations of counterparts. Using a combination of photometric and spectroscopic redshifts that exist for 80% of the sources in our sample, we are able to estimate the rest-frame luminosities of galaxies at 15m and 35m. By complementing direct detections with a careful stacking analysis, we measured the mid- and far-infrared luminosity functions of galaxies over a factor 100 in luminosity ()at z<1.3. A stacking analysis was performed to validate the bolometric corrections and to compute comoving star-formation rate densities in three redshift bins 0.4