Publications (19)
Rising from the Ashes II: The Bar-driven Abundance Bimodality of the Milky Way
Angus Beane, James Johnson, Vadim Semenov +3
The Milky Way hosts at least two modes in its present day distribution of Fe and alpha-elements. The exact cause of this bimodality is disputed, but one class of explanations invol…
Mapping the Milky Way in 5-D with 170 Million Stars
Joshua S. Speagle, Catherine Zucker, Ana Bonaca +18
We present "augustus", a catalog of distance, extinction, and stellar parameter estimates to 170 million stars from and with dr…
Characterizing the 3D Kinematics of Young Stars in the Radcliffe Wave
Alan J. Tu, Catherine Zucker, Joshua S. Speagle +5
We present an analysis of the kinematics of the Radcliffe Wave, a 2.7-kpc-long sinusoidal band of molecular clouds in the solar neighborhood recently detected via 3D dust mapping.…
The Impact of Classical Bulges on Stellar Bars and Box-Peanut-X-Features in Disk Galaxies
Rachel Lee McClure, Angus Beane, Elena D'Onghia +2
Galactic bars and their associated resonances play a significant role in shaping galaxy evolution. Resulting resonance-driven structures, like the vertically extended Boxy/Peanut X…
Rising from the Ashes: A Metallicity-Dependent Star Formation Gap Splits the Milky Way's alpha-Sequences
Angus Beane
The elemental abundance distribution of stars encodes the history of the gas-phase abundance in the Milky Way. Without a large, unbiased sample of highly precise stellar ages, the…
Tomography of the Cosmic Dawn and Reionization Eras with Multiple Tracers
Tzu-Ching Chang, Angus Beane, Olivier Dore +41
The Cosmic Dawn and Reionization epochs remain a fundamental but challenging frontier of astrophysics and cosmology. We advocate a large-scale, multi-tracer approach to develop a c…
Deriving Stellar Properties, Distances, and Reddenings using Photometry and Astrometry with BRUTUS
Joshua S. Speagle, Catherine Zucker, Angus Beane +18
We present brutus, an open source Python package for quickly deriving stellar properties, distances, and reddenings to stars based on grids of stellar models constrained by photome…
In the Galactic disk, stellar [Fe/H] and age predict orbits and precise [X/Fe]
Melissa K. Ness, Kathryn V. Johnston, Kirsten Blancato +4
We explore the structure of the element abundance--age--orbit distribution of the stars in the Milky Way's low- disk, by (re-)deriving precise [Fe/H], [X/Fe] and ages, along wi…
Secular Attrition of Classical Bulges by Stellar Bars
Rachel Lee McClure, Tobias Géron, Elena D'Onghia +5
Classical bulges and stellar bars are common features in disk galaxies and serve as key tracers of galactic evolution. Angular momentum exchange at bar resonances drives secular mo…
How Nested Bars Enhance, Modulate, and are Destroyed by Gas Inflows
Zhi Li, Min Du, Victor P. Debattista +7
Gas flows in the presence of two independently-rotating nested bars remain not fully understood, which is likely to play an important role in fueling the central black hole. We use…
Exploring the evolution of stellar rotation using Galactic kinematics
Ruth Angus, Angus Beane, Adrian M. Price-Whelan +9
The rotational evolution of cool dwarfs is poorly constrained after around 1-2 Gyr due to a lack of precise ages and rotation periods for old main-sequence stars. In this work we u…
Measuring the EoR Power Spectrum Without Measuring the EoR Power Spectrum
Angus Beane, Francisco Villaescusa-Navarro, Adam Lidz
The large-scale structure of the Universe should soon be measured at high redshift during the Epoch of Reionization (EoR) through line-intensity mapping. A number of ongoing and pl…
Actions are weak stellar age indicators in the Milky Way disk
Angus Beane, Melissa K. Ness, Megan Bedell
The orbital properties of stars in the disk are signatures of their formation, but they are also expected to change over time due to the dynamical evolution of the Galaxy. Stellar…
Fuzzy Dark Matter and the 21cm Power Spectrum
Dana Jones, Skyler Palatnick, Richard Chen +2
We model the 21cm power spectrum across the Cosmic Dawn and the Epoch of Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression of small mass halos in FDM model…
Extracting bias using the cross-bispectrum: An EoR and 21 cm-[CII]-[CII] case study
Angus Beane, Adam Lidz
The amplitude of redshifted 21 cm fluctuations during the Epoch of Reionization (EoR) is expected to show a distinctive "rise and fall" behavior with decreasing redshift as reioniz…
The Implications of Local Fluctuations in the Galactic Midplane for Dynamical Analysis in the Gaia Era
Angus Beane, Robyn E. Sanderson, Melissa K. Ness +6
Orbital properties of stars, computed from their six-dimensional phase space measurements and an assumed Galactic potential, are used to understand the structure and evolution of t…
Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down
Angus Beane, Lars Hernquist, Elena D'Onghia +6
Elongated bar-like features are ubiquitous in galaxies, occurring at the centers of approximately two-thirds of spiral disks in the nearby Universe. Due to gravitational interactio…
Ray-tracing Fast Radio Bursts Through IllustrisTNG: Cosmological Dispersion Measures from Redshift 0 to 5.5
Ralf M. Konietzka, Liam Connor, Vadim A. Semenov +3
The dispersion measures (DMs) of Fast Radio Bursts (FRBs) arise predominantly from free electrons in the large-scale structure of the Universe. The increasing number of FRB observa…
Insights into the 21 cm field from the vanishing cross-power spectrum at the epoch of reionization
Kana Moriwaki, Angus Beane, Adam Lidz
The early stages of the Epoch of Reionization, probed by the 21 cm line, are sensitive to the detailed properties and formation histories of the first galaxies. We use 21cmFAST and…