Maryam Tajalli
Leiden Observatory
Luminous and Dark Matter in Massive Early-type Galaxies with Weak Gravitational Lensing
Abstract: The stellar initial mass function (IMF) is one of the fundamental properties of stellar populations and detecting a variation, or lack thereof, of the IMF with galaxy properties can give us insight into the physics of star formation. However, determining the stellar IMF of massive galaxies is still one of the open problems in cosmology. Future space-based surveys will provide unprecedented weak lensing shape measurements on scales of a few tens of kpc, enabling us to probe the stellar masses of galaxies as well as the inner slope of the dark matter density profile.
In this talk, I will present forecasted constraints on the stellar IMF and stellar-to-halo mass relation of massive early-type galaxies from the future Euclid survey based on the Bayesian hierarchical inference formalism that we have developed. I will show that Euclid is expected to constrain the IMF normalization at the unprecedented level of ∼ 0.02 dex, allowing us to distinguish between a Salpeter and a Chabrier IMF. This is an important result and could lead to a solution to one of the open problems in cosmology, that is, whether the stellar IMF is a universal function or not.
یکشنبه 19 دی 1400، ساعت 19:00
Sunday 9 January 2022 – 19:00 Tehran Time
اتاق سمینار مجازی –Virtual Seminar Room
https://vc.sharif.edu/ch/cosmology
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