[Physics-grads-open] PASS talk on Galaxy formation simulations

[Pooyan Goodarzi]

Reminder: Eric's talk will be in ~2 hours.

On 2/21/25 7:02 PM, Pooyan Goodarzi wrote:
>
> Hi all,
>
> We will have a PASS talk next Monday. Please join us at noon (from 
> 12:00 pm to 1:00 pm) in the Nebula Room (PHYS 3027).
>
>
> *Eric Zhang, PhD student*
> Monday, 12:00 pm, Nebula Room (PHYS 3027)
> *Implementing Supernova Feedback in Galaxy Formation Simulations: 
> Sensitivity to Numerical Choices*
>
>
> Simulations of galaxy formation are mostly unable to resolve the 
> energy-conserving phase of individual supernova events, having to 
> resort to subgrid models to distribute the energy and momentum 
> resulting from stellar feedback. However, the properties of these 
> simulated galaxies, including the morphology, stellar mass formed and 
> the burstiness of the star formation history, are highly sensitive to 
> numerical choices adopted in these subgrid models. Using the SMUGGLE 
> stellar feedback model, we carry out idealized simulations of a 𝑀vir 
> ∼ 1010 M⊙ dwarf galaxy, a regime where most simulation codes predict 
> significant burstiness in star formation, resulting in strong gas 
> flows that lead to the formation of dark matter cores. We find that by 
> varying only the directional distribution of momentum imparted from 
> supernovae to the surrounding gas, while holding the total momentum 
> per supernova constant, bursty star formation may be amplified or 
> completely suppressed, and the total stellar mass formed can vary by 
> as much as a factor of ∼ 3. In particular, when momentum is primarily 
> directed perpendicular to the gas disk, less bursty and lower overall 
> star formation rates result, yielding less gas turbulence, more disky 
> morphologies and a retention of cuspy dark matter density profiles. An 
> improved understanding of the non-linear coupling of stellar feedback 
> into inhomogeneous gaseous media is thus needed to make robust 
> predictions for stellar morphologies and dark matter core formation in 
> dwarfs independent of uncertain numerical choices in the baryonic 
> treatment.
>
>
> 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>].
>
>
> Best,
> Pooyan
> Physics and Astronomy Student Seminar (PASS)
> https://ucrpass.arxiv.social
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ucr.edu/pipermail/physics-grads-open/attachments/20250224/9ae8a197/attachment.htm>