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Gentle reminder of this at 1pm today!</div>
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Cheers,</div>
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Guillaume</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Guillaume Hewitt<br>
<b>Sent:</b> Monday, April 27, 2026 10:07 AM<br>
<b>To:</b> Nottingham Astro Group <astro@nottingham.ac.uk><br>
<b>Subject:</b> Lunch Talk - 30/04/2026</font>
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Hi everyone,</div>
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This week's lunch talk will be given by Callum O'Kane on Thursday April 30<sup>th</sup> at 1pm in A113. Title and abstract are below.</div>
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<b>Title</b>: Environmental Dependence of Galaxy Evolutionary Histories</div>
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<span style="font-family:Aptos,"Aptos_EmbeddedFont","Aptos_MSFontService",Calibri,Helvetica,sans-serif,serif,EmojiFont; color:rgb(0,0,0)"><b>Abstract</b>:
</span><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif,serif,EmojiFont; color:black">Understanding how environment shapes galaxy evolution remains a fundamental challenge, yet most studies focus solely on present-day
properties. Here, we move beyond this limitation by reconstructing star formation and chemical enrichment histories using physically motivated galaxy evolution models that incorporate gas inflows and outflows, with parameters constrained through full spectral
fitting.</span></div>
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We analyse a sample of ~10,000 massive (M<sub>⋆</sub> > 10^10.45 M<sub>☉</sub>) galaxies with high signal-to-noise spectra from the Sloan Digital Sky Survey, recovering a diverse range of evolutionary histories across environments spanning the field, filaments,
groups, and clusters. We identify several distinct evolutionary pathways and quantify their relative abundance as a function of environment.</div>
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We then assess whether differences between environments persist after controlling for stellar mass and local density, highlighting the dominant role of the small-scale environment, as traced by local density.</div>
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Cheers,</div>
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Guillaume</div>
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