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

[Pooyan Goodarzi]

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
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