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

[Pooyan Goodarzi]

Reminder: happening in ~2 hours.

On 10/16/25 12:02 PM, Pooyan Goodarzi wrote:
>
> 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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