[Physics-talks] Public dissertation defense: Ian McConachie

[Ian McConachie]

Happening in 15 minutes!

Ian

On Wednesday, December 6, 2023, Arianna Mondragon <arianna.mondragon at ucr.edu>
wrote:

> Hello all,
>
> I'd like to advertise my defense, which is scheduled for 9:30 AM on
> Friday, December 8 in the Physics Reading Room. It will be hybrid, so here
> is the link:
>
> https://ucr.zoom.us/j/96681905100
> Meeting ID: 966 8190 5100
>
> Title: Ultra-Massive Galaxies in Galaxy Protoclusters at z>3
>
> Abstract: We present a comprehensive study of ultra-massive galaxies
> (UMGs) in three spectroscopically-confirmed protoclusters at z>3 discovered
> by the Massive Ancient Galaxies At z > 3 NEar-infrared (MAGAZ3NE) survey in
> the COSMOS UltraVISTA field.  We measure an elevated fraction of quiescent
> galaxies relative to the coeval field for massive galaxies in one
> protocluster, which provides a striking and important counterexample to the
> seeming ubiquitousness of star-forming galaxies in protoclusters and
> highlights the diversity of evolutionary states of protoclusters in the
> early Universe. Two protoclusters separated by 18 arcminutes on the sky (35
> comoving Mpc), in good agreement with predictions from simulations for the
> size of ``Coma''-type cluster progenitors at this epoch. We produce
> overdensity maps of all three protoclusters, finding good agreement between
> our results, other observations of these structures, and simulations of
> cluster progenitors. We show that while the properties of UMGs and their
> neighboring galaxies in protoclusters appear to be correlated, UMGs and
> protoclusters exist in a diversity of evolutionary states at early cosmic
> times. We find that the other massive galaxies around the protocluster UMGs
> appear to obey galactic conformity in their rest-frame colors, which would
> be the first detection of conformity at z>3.
>
>
> Thank you!
> Ian
>
>
>

-- 
Ian McConachie
PhD Candidate
Department of Physics & Astronomy - UC Riverside
ian.mcconachie at email.ucr.edu
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