The Romulus Simulations

SMBH Dynamics

AGN Feedback and Galaxy Quenching

Galaxy Evolution in Dense Environments

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Michael Tremmel's Research

My work focuses on the co-evolution of supermassive black holes (SMBHs) and their host galaxies. I'm particularly interested in SMBH dynamical evolution within their galaxies and how it relates to SMBH binary formation and mergers. I'm also interested in how and where SMBHs grow and how that growth can affect their host galaxy. Find below more detailed topics about my research. Click the links for more information (maybe even too much!) about each topic and learn more about what I've done and what I'm currently up to.

The Romulus Simulations

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A new set of large-scale cosmological simulations run in collaboration with Tom Quinn , Fabio Governato (University of Washington), Andrew Pontzen (University College London), Marta Volonteri (Institut d'Astrophysique de Paris), and others. These simulations include a novel implementation of supermassive black hole physics developed as my PhD thesis project. Read more about the simulations here or read the paper .

Supermassive Black Hole Dynamics

By utilizing a new method to model the dynamics of supermassive black holes that I developed, I study the orbital evolution of SMBHs within galaxies. I'm interested in predicting when and where SMBH mergers should occur and how often SMBHs become permanent "wanderers", never making it to galactic center.

AGN Feedback and Galaxy Quenching

Supermassive black holes, despite being approximately the size of our solar system, can result in highly energetic phenomena when they accrete nearby gas. This release of energy is what powers active galactic nuclei (AGN), bright central regions of galaxies, and is thought to be a major reason why most massive galaxies have little ongoing star formation at later times. Using high resolution cosmological simulations, as well as some other state-of-the-art numerical techniques, I study how and why star formation becomes quenched by feedback from AGN.

RomulusC: Galaxy Evolution in Dense Environments

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We have run the highest resolution cosmological simulation of a galaxy cluster to date (as of the writing of this page). We are able to study how AGN feedback is able to regulate star formation in the most massive galaxies with unprecedented detail. With such high resolution, we are also able to examine the evolution of both massive galaxies and dwarfs in dense environments. Leveraging the fact that RomulusC is run with the same resolution and physics as Romulus25, we are able to directly compare galaxy evolution in different environments.

© 2018 Michael Tremmel | Based on the template design by Andreas Viklund