[Physics-grads-open] Astronomy PASS talk on Monday

[Pooyan Goodarzi]

Hi all,


We will have a PASS talk by Eric next *Monday*, October 20, at noon. 
Please join us at noon (*from 12:00 to 1:00 pm*) in the Nebula Room 
(PHYS 3027).


*Eric Zhang, PhD Student*
Monday, 12:00 pm, Nebula Room (PHYS 3027)

*The Entangled Feedback Impacts of Supernovae in Coarse- versus 
High-Resolution Galaxy Simulations*

*
*

It is often understood that supernova (SN) feedback in galaxies is 
responsible for regulating star formation and generating gaseous 
outflows. However, a detailed look at their effect on the local 
interstellar medium (ISM) on small mass scales in simulations shows that 
these processes proceed in clearly distinct channels. We demonstrate 
this finding in two independent simulations with solar-mass resolution, 
LYRA and RIGEL, of an isolated dwarf galaxy. Focusing on the immediate 
environment surrounding SNe, our findings suggest that the large-scale 
effect of a given SN on the galaxy is best predicted by its immediate 
local density. Outflows are driven by SNe in diffuse regions expanding 
to their cooling radii on large (∼ kpc) scales, while dense star-forming 
regions are disrupted in a localized (∼ pc) manner. However, these 
separate feedback channels are only distinguishable at very high 
numerical resolutions capable of following scales ≪ 10^3 M⊙. On larger 
scales, ISM densities are greatly mis-estimated, and differences between 
local environments of SNe become severely washed out. We demonstrate the 
practical implications of this effect by comparing with a mid-resolution 
simulation (𝑀ptcl. ∼ 200 M⊙) of the same dwarf using the SMUGGLE model. 
The coarse-resolution simulation cannot self-consistently determine 
whether a given SN is responsible for generating outflows or suppressing 
star formation, suggesting that emergent galaxy physics such as star 
formation regulation through hot-phase outflows is fundamentally 
unresolvable by subgrid stellar feedback models, without appealing 
directly to simulations with highly resolved ISM.



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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