Séminaire/Seminar Galaxies |
| « COSMOS2020: The cosmic evolution of the stellar-to-halo mass relation for central and satellite galaxies up to z=5. » |
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Marko Shuntov |
| The stellar-to-halo mass relation (SHMR) expresses the efficiency of the stellar mass assembly integrated over the lifetime of the halo’s lifetime and is a strong function of the halo mass. The literature lacks a conclusive measurement of the SHMR evolution with redshift above z>1, where there’s a large scatter between different works. In this talk I will present a measurement of the SHMR in 10 redshift bins up to z=5.5 using the new COSMOS2020 catalogue by measuring galaxy clustering and stellar mass functions. This work builds on that in the literature in several key points: we probe the majority of cosmic history, we use a single, homogenous, data set for all our measurements and we adopt a HOD-based formalism that constrains the contribution from both central and satellite galaxies to the SHMR. Finally, we extensively compare our results with hydrodynamical simulations to shed some light on the possible physical mechanisms that make the galaxy formation so inefficient. |
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jeudi 27 janvier 2022 - 11:30 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |