The observed total star formation rate function up to z ∼ 6: Complementary UV and IR contributions and comparison with state-of-the-art galaxy formation models
Year: 2025
Type: article
Abstract: Aims. We investigated how the obscured IR-derived and dust-corrected UV star formation rate functions (SFRFs) compare with each other and with predictions from state-of-the-art theoretical models of galaxy formation and evolution. Methods. We derived the IR SFRF from the ALMA A 3 COSMOS survey by converting the IR luminosity functions (IR LFs) into SFRFs after correcting for the active galactic nucleus (AGN) contribution. Similarly, we obtained the UV SFRFs from UV LFs in the literature, corrected for dust-extinction. First, we fit the two SFRFs independently via a Markov chain Monte Carlo (MCMC) approach, then we combined them to obtain the first estimate of the “total” SFRF out to z ∼ 6. Finally, we compared this SFRF with predictions of a set of theoretical models. Results. We derive the UV and IR SFRFs at 0.5 < z < 6, using dust-extinction-corrected UV LFs from the literature and IR LFs from Herschel and ALMA. We find that the two functions are largely complementary, covering different ranges in star formation rate (SFR < 10–100 M ⊙ yr −1 for the UV-corrected, and SFR > 100 M ⊙ yr −1 for the IR). From the comparison of the total SFRF with model predictions, we find overall good agreement at z < 2.5, with increasing difference at higher redshifts; all models miss the galaxies that form stars with the highest SFRs. Finally, we finally obtain the UV (dust-corrected), IR and total SFR densities (SFRDs), finding that there are no redshift ranges where UV and IR alone are able to reproduce the total SFRD.
Source: Astronomy and Astrophysics
Authors: A. Traina, C. Gruppioni, I. Delvecchio, B. Magnelli, F. Calura, L. Bisigello, A. Feltre, L. Vallini, G. De Lucia, F. Fontanot, M. Hirschmann, A. Katsianis, M. Parente, O. Cucciati, L. Xie, E. Schinnerer, D. Liu, S. Adscheid, H. S. B. Algera, M. Behiri, F. Gentile, S. Gillman, F. Pozzi, G. Zamorani
Institutions: Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, Centre National de la Recherche Scientifique, Université Paris Cité, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Astrophysique, Instrumentation et Modélisation, Osservatorio Astronomico di Padova, Arcetri Astrophysical Observatory, Trieste Astronomical Observatory, Institute for Fundamental Physics of the Universe, École Polytechnique Fédérale de Lausanne, Sun Yat-sen University, Tianjin Normal University, Max Planck Institute for Astronomy, Chinese Academy of Sciences, Purple Mountain Observatory, University of Bonn, Institute of Astronomy and Astrophysics, Academia Sinica, Academia Sinica, Scuola Internazionale Superiore di Studi Avanzati, Istituto di Radioastronomia di Bologna, DTU Space, Technical University of Denmark, University of Bologna
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
OpenAlex ID: W7110984454