Resolved Multi-element Stellar Chemical Abundances in Lensed Quiescent Galaxies at z ∼ 2

Marziye Jafariyazani

Carnegie Observatories & University of California, Riverside

 

Abstract: Measuring the chemical composition of galaxies is crucial to our understanding of galaxy formation and evolution models. However, such measurements are extremely challenging for quiescent galaxies at high redshifts, which have faint stellar continua and compact sizes, making it difficult to detect absorption lines and nearly impossible to spatially resolve them. Gravitational lensing offers the opportunity to study these galaxies with detailed spectroscopy that can be even spatially resolved. In this talk, I will first give an introduction on the chemical evolution modeling of galaxies and its current challenges. Then I will present my results on analyzing the spectra of MRG-M0138, the brightest lensed quiescent galaxy at z ~ 2. Taking advantage of full spectral fitting, I measure [Mg/Fe], [Fe/H] and, for the first time, the stellar abundances of 6 other elements in this galaxy. I further constrained, also for the first time in a z ∼ 2 galaxy, radial gradients in stellar age, [Fe/H], and [Mg/Fe]. I will discuss how these measurements challenge simple galactic chemical evolution models that vary only the star formation timescale and show the need for more elaborate models. Lastly, I will present our preliminary results on extending such measurements for a few more lensed quiescent galaxies at high redshifts.

 

 

 

یکشنبه 16 آذر 1399، ساعت 19:00

Sunday 6 December 2020 – 19:00 Tehran Time

اتاق سمینار مجازی –Virtual Seminar Room

https://vc.sharif.edu/ch/cosmology

گزینه ورود به صورت مهمان – Enter as a Guest