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<p>Hi all,</p>
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<p>We will have a PASS talk by Eric next <b>Monday</b>, October 20,
at noon. Please join us at noon (<b>from 12:00 to 1:00 pm</b>) in
the Nebula Room (PHYS 3027). </p>
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<p align="center"><b>Eric Zhang, PhD Student</b><br>
Monday, 12:00 pm, Nebula Room (PHYS 3027)</p>
<p align="center"><b>The Entangled Feedback Impacts of Supernovae in
Coarse- versus High-Resolution Galaxy Simulations</b></p>
<p align="center"><b><br>
</b></p>
<p align="center">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.</p>
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<div
id="m_-7314571423100097885m_-3414541767872711075m_9215603032040371864m_-1672972118947443868gmail-:1f4">
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<div dir="ltr">If you’re interested in sharing your work as a
speaker, please feel free to add your name to this spreadsheet
[<a
href="https://docs.google.com/spreadsheets/d/1N3ncf43jdB6aHYHhyWmyHMycxDg4_phHZXLkQvviO0o/edit?usp=sharing"
target="_blank">Google Sheet</a>]. Recordings of all the
previous talks are available on our website: <a
href="https://ucrpass.arxiv.social/" target="_blank"
class="moz-txt-link-freetext">https://ucrpass.arxiv.social</a>
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Best,<br>
Pooyan<br>
Physics and Astronomy Student Seminar (<span><span>PASS</span></span>)
<br>
<a href="https://ucrpass.arxiv.social/" target="_blank"
class="moz-txt-link-freetext">https://ucrpass.arxiv.social</a></div>
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