[Physics-grads-open] PASS talk on Galaxy Morphology

[Pooyan Goodarzi]

Hi everyone,


We will have the first PASS talk of this academic year on *Monday, 
September 29*. Jose will be talking about the Morphological diversity of 
Galaxies in the Local Universe. Please join us at noon (*from 12:00 to 
1:00 pm*) in the *Nebula Room* (PHYS 3027).


*Dr. Jose Benavides, PostDoc Researcher
*Monday, 12:00 pm, Nebula Room (PHYS 3027)

*Exploring the Morphological Diversity of Galaxies in the Local Universe*

*
*

In the  Local Universe, galaxies exhibit a remarkable morphological 
diversity, ranging from massive spirals and ellipticals to irregular and 
dispersion-dominated low-mass systems. Understanding the origin of this 
diversity is of vital importance for testing and refining our models of 
galaxy formation and evolution.

In the first part, I will focus on the physical conditions that govern 
disc formation in low-mass galaxies (M_star < 10^10 M_sun). Using data 
from the FIREbox and FIRE zoom-in cosmological simulations, we explore 
how stellar feedback, gas dynamics, and halo spin contribute to the 
emergence of rotationally supported structures. Our results show that 
discs can form under specific conditions—such as the presence of cold, 
high-angular-momentum gas or interactions with satellites—and we 
identify a morphological transition from spheroidal to disky systems at 
M_star ~ 10^9 -10^10 M_sun.

In the second part, I will analyze the shapes of galaxies through the 
distribution of projected axis ratios (q=b/a) across both observational 
surveys (GAMA, DESI, ALFALFA, and Nearby Galaxy surveys) and 
cosmological simulations (TNG50, FIREbox, and ROMULUS25). This 
comparison reveals a systematic under-prediction of thin, disky low-mass 
galaxies in simulations, suggesting limitations in current models of 
baryonic physics, feedback, and morphological evolution.



If you’re interested in sharing your work as a speaker, please feel free 
to add your name to this spreadsheet [Google Sheet 
<https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing>]. 
Recordings of all the previous talks are available on our website: 
https://ucrpass.arxiv.social


Best,
Pooyan
Physics and Astronomy Student Seminar (PASS)
https://ucrpass.arxiv.social



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