2024/07/15 by Matteo Bonato, Ivano Baronchelli, Bonato, Matteo +13
Physics and Astronomy · #Astrophysics and Star Formation Studies #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2407.10801
openalex publication_date 2024/07/15 · openalex created_date 2024/07/17 · openalex updated_date 2026/07/28
We exploit the DustPedia sample of galaxies within approximately 40 Mpc, selecting 388 sources, to investigate the correlations between IR luminosity (L\rm IR), the star formation rate (SFR), and the CO(1-0) luminosity (L\rm CO) down to much lower luminosities than reached by previous analyses. We find a sub-linear dependence of the SFR on L\rm IR. Below log(\hboxL\rm IR/\hboxL_\odot)≃ 10 or \hboxSFR≃ 1 \hboxM_\odot \hboxyr-1, the SFR/L\rm IR ratio substantially exceeds the standard ratio for dust-enshrouded star formation, and the difference increases with decreasing L\rm IR values. This implies that the effect of unobscured star formation overcomes that of dust heating by old stars, at variance with results based on the Planck ERCSC galaxy sample. We also find that the relations between the L\rm CO and L\rm IR or the SFR are consistent with those obtained at much higher luminosities.