The main sequence of star-forming galaxies – II. A non-evolving slope at the 
high-mass end

Popesso, P.; Morselli, L.; Concas, A.; Schreiber, C.; Rodighiero, G.; Cresci, G.; Belli, S.; Ilbert, O.; Erfanianfar, G.; Mancini, C.; Inami, H.; Dickinson, M.; Pannella, M.; Elbaz, D.

doi:10.1093/mnras/stz2635

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The main sequence of star-forming galaxies – II. A non-evolving slope at the high-mass end

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Belli, S.
Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society;

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Erfanianfar, G.
High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;

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Citation

Popesso, P., Morselli, L., Concas, A., Schreiber, C., Rodighiero, G., Cresci, G., et al. (2019). The main sequence of star-forming galaxies – II. A non-evolving slope at the high-mass end. Monthly Notices of the Royal Astronomical Society, 490(4), 5285-5299. doi:10.1093/mnras/stz2635.

Cite as: https://hdl.handle.net/21.11116/0000-0005-90AC-6

Abstract

By using the deepest available mid- and far-infrared surveys in the CANDELS, GOODS, and COSMOS fields we study the evolution of the main sequence (MS) of star-forming galaxies (SFGs) from z ∼ 0 to ∼ 2.5 at stellar masses larger than 10¹⁰ M_⊙. The MS slope and scatter are consistent with a rescaled version of the local relation and distribution, shifted at higher values of star formation rate (SFR) according to ∝ (1 + z⁠)^3.2. The relation exhibits a bending at the high-mass end and a slightly increasing scatter as a function of the stellar mass. We show that the previously reported evolution of the MS slope, in the considered mass and redshift range, is due to a selection effect. The distribution of galaxies in the MS region at fixed stellar mass is well represented by a single lognormal distribution at all redshifts and masses, with starburst galaxies occupying the tail at high SFR.