The edges of galaxies: tracing the limits of star formation

by Dr Nushkia Chamba (The Oskar Klein Center and Stockholm University)

Friday 25 Nov 2022, 11:00 → 12:00 Europe/Rome

Sala Jappelli (Osservatorio )

 

ABSTRACT

The outskirts of galaxies have been studied from multiple perspectives for the past few decades. However, it is still unknown if all galaxies have clear-cut edges like everyday objects. In this seminar, we present physically motivated criteria to define the edges of galaxies, based on the gas density threshold required for either past or ongoing in-situ star formation. We will discuss the analysis of 1000 nearby galaxies using ultra-deep optical imaging and how the radial location of their edges (R_edge) depends on galaxy morphology and global stellar mass. Remarkably, the stellar mass-size relation using R_edge as a physically motivated galaxy size measure has a very narrow intrinsic scatter (< 0.06 dex) over nearly four orders of magnitude in stellar mass. We will discuss the implication of our findings on the growth and evolution of galaxies.

 

The seminar will be in Aula Jappelli and on line:

 

Seminario Dott.ssa Nushkia Chamba 
Venerdì, 25 novembre · 11:00AM – 12:00PM
 

Informazioni per partecipare di Google Meet
Link alla videochiamata: https://meet.google.com/ynj-dbda-tgg
Oppure digita: ‪(IT) +39 02 3041 9861‬ PIN: ‪923 825 394‬#