The role of massive halos in the Star Formation History of the Universe
P. Popesso, A. Biviano, A. Finoguenov, D. Wilman, M. Salvato, B., Magnelli, C. Gruppioni, F. Pozzi, G. Rodighiero, F. Ziparo, S. Berta, D., Elbaz, M.Dickinson, D. Lutz, B. Altieri, H. Aussel, A. Cimatti, D. Fadda, O., Ilbert, E. Le Floch, R. Nordon, A. Poglitsch, S. Genel

TL;DR
This study investigates how the assembly and growth of halos influence the decline in cosmic star formation, highlighting the dominant role of low-mass groups at z~1 and the importance of slow quenching processes in massive halos.
Contribution
It provides new insights into the contribution of different halo masses to the cosmic star formation history and emphasizes the role of slow quenching mechanisms in massive halos.
Findings
Low mass groups contribute 60-80% to CSFH at z~1.
Contribution from low mass groups declines to less than 10% at z<0.3.
Massive halos have a marginal contribution (<10%) at all epochs.
Abstract
The most striking feature of the Cosmic Star Formation History (CSFH) of the Universe is a dramatic drop of the star formation (SF) activity, since z~1. In this work we investigate if the very same process of assembly and growth of structures is one of the major drivers of the observed decline. We study the contribution to the CSFH of galaxies in halos of different masses. This is done by studying the total SFR-halo mass-redshift plane from redshift 0 to redshift z~1.6 in a sample of 57 groups and clusters by using the deepest available mid- and far-infrared surveys conducted with Spitzer MIPS and Herschel PACS and SPIRE. Our results show that low mass groups provide a 60-80% contribution to the CSFH at z~1. Such contribution declines faster than the CSFH in the last 8 billion years to less than 10% at z<0.3, where the overall SF activity is sustained by lower mass halos. More massive…
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