no code implementations • 24 Feb 2021 • Omid Sameie, Michael Boylan-Kolchin, Robyn Sanderson, Drona Vargya, Philip Hopkins, Andrew Wetzel, James Bullock, Andrew Graus
We study star formation rates and the shape of dark matter density profiles of the parent haloes in both cold dark matter (CDM) and SIDM models.
Astrophysics of Galaxies
no code implementations • 15 Jul 2019 • Bryan Ostdiek, Lina Necib, Timothy Cohen, Marat Freytsis, Mariangela Lisanti, Shea Garrison-Kimmel, Andrew Wetzel, Robyn E. Sanderson, Philip F. Hopkins
The goal of this study is to present the development of a machine learning based approach that utilizes phase space alone to separate the Gaia DR2 stars into two categories: those accreted onto the Milky Way from those that are in situ.
no code implementations • 29 Oct 2018 • Lina Necib, Mariangela Lisanti, Shea Garrison-Kimmel, Andrew Wetzel, Robyn Sanderson, Philip F. Hopkins, Claude-André Faucher-Giguère, Dušan Kereš
Based on results from Gaia, we estimate that $42 ^{+26}_{-22}\%$ of the local dark matter that is accreted from luminous mergers is in debris flow.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
1 code implementation • 12 Dec 2017 • Ethan O. Nadler, Yao-Yuan Mao, Risa H. Wechsler, Shea Garrison-Kimmel, Andrew Wetzel
We identify subhalos in dark matter-only (DMO) zoom-in simulations that are likely to be disrupted due to baryonic effects by using a random forest classifier trained on two hydrodynamic simulations of Milky Way (MW)-mass host halos from the Latte suite of the Feedback in Realistic Environments (FIRE) project.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
1 code implementation • 25 Jul 2011 • Jeremy Tinker, Andrew Wetzel, Charlie Conroy
Using the 4000-A break as a measure of star formation history, we examine the correlation between the quenched fraction of galaxies, f_q, and large-scale environment, rho.
Cosmology and Nongalactic Astrophysics