2006/09/27 by V. Buat, Tsutomu T. Takeuchi, T. T. Takeuchi +39 · 1 citation
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astrophysics #Far infrared #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Luminosity function #Luminous infrared galaxy #Physics #Star formation #Stars #Stellar mass #Stellar, planetary, and galactic studies #Universe #astro-ph
paper · pdf · doi:10.1086/516645
32 pages, 9 figures, to be published in the Astrophysical Journal Supplement series dedicated to GALEX results
arxiv created 2006/09/27 · openalex publication_date 2007/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We select far-infrared (FIR: 60 μm) and far-ultraviolet (FUV: 530 Å) samples of nearby galaxies in order to discuss the biases encountered by monochromatic surveys (FIR or FUV). Very different volumes are sampled by each selection, and much care is taken to apply volume corrections to all the analyses. The distributions of the bolometric luminosity of young stars are compared for both samples: they are found to be consistent with each other for galaxies of intermediate luminosities, but some differences are found for high (>5 × 10 10 L ☉ ) luminosities. The shallowness of the IRAS survey prevents us from securing a comparison at low luminosities (<2 × 10 9 L ☉ ). The ratio of the total infrared (TIR) luminosity to the FUV luminosity is found to increase with the bolometric luminosity in a similar way for both samples up to 5 × 10 10 L ☉ . Brighter galaxies are found to have a different behavior according to their selection: the L TIR / L FUV ratio of the FUV-selected galaxies brighter than 5 × 10 10 L ☉ reaches a plateau, whereas L TIR / L FUV continues to increase with the luminosity of bright galaxies selected in FIR. The volume-averaged specific star formation rate (SFR per unit galaxy stellar mass, SSFR) is found to decrease toward massive galaxies within each selection. The mean values of the SSFR are found to be larger than those measured for optical and NIR-selected samples over the whole mass range for the FIR selection, and for masses larger than 10 10 M ☉ for the FUV selection. Luminous and massive galaxies selected in FIR appear as active as galaxies with similar characteristics detected at z ∼ 0.7.