Probing stellar population models in the near-IR with JWST скачать в хорошем качестве

Probing stellar population models in the near-IR with JWST

Claudia Maraston (Institute of Cosmology and Gravitation, Portsmouth University, UK) The determination of age and chemical composition for extra-galactic populations, such as galaxies up to the dawn of time is essential to understand the process of galaxy formation and evolution. This is accomplished by comparing galaxy spectral data to stellar population models. The input physics of the models drive inferences on galaxy evolution. In spite of tremendous progress over the past two decades, the near-IR part of model spectra kept being at the centre of a vivid debate, especially regarding the contribution from short-living yet highly luminous asymptotic giant branch (AGB) stars. I shall discuss the recent detection of spectral signatures from AGB stars in JWST spectra of massive galaxies 8 Gyr back in cosmic time and how this helps constraining theoretical models and improving the accuracy of galaxy ages and star formation histories. February 16, 2026