Angus Beane
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View article: Ray-tracing Fast Radio Bursts Through IllustrisTNG: Cosmological Dispersion Measures from Redshift 0 to 5.5
Ray-tracing Fast Radio Bursts Through IllustrisTNG: Cosmological Dispersion Measures from Redshift 0 to 5.5 Open
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 observations have started to empirically constrain the distributio…
View article: Secular Attrition of Classical Bulges by Stellar Bars
Secular Attrition of Classical Bulges by Stellar Bars Open
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 morphological changes throughout the disk, including bar slow…
View article: Rising from the Ashes. II. The Bar-driven Abundance Bimodality of the Milky Way
Rising from the Ashes. II. The Bar-driven Abundance Bimodality of the Milky Way Open
The Milky Way hosts at least two modes in its present-day distribution of Fe and α -elements. The exact cause of this bimodality is disputed, but one class of explanations involves the merger between the Milky Way and a relatively massive …
View article: Rising from the Ashes: A Metallicity-dependent Star Formation Gap Splits the Milky Way’s <i>α</i> Sequences
Rising from the Ashes: A Metallicity-dependent Star Formation Gap Splits the Milky Way’s <i>α</i> Sequences Open
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 exact timing and nature of this history must be inferred fr…
View article: Mapping the Milky Way in 5D with 170 Million Stars
Mapping the Milky Way in 5D with 170 Million Stars Open
We present Augustus , a catalog of distance, extinction, and stellar parameter estimates for 170 million stars from 14 mag < r < 20 mag and with ∣ b ∣ > 10° drawing on a combination of optical to near-infrared photometry from Pan-STARRS, 2…
View article: Insights into the 21 cm field from the vanishing cross-power spectrum at the epoch of reionization
Insights into the 21 cm field from the vanishing cross-power spectrum at the epoch of reionization Open
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 a simple, self-consistent galaxy model to examine the reds…
View article: Insights into the 21 cm field from the vanishing cross-power spectrum at the epoch of reionization
Insights into the 21 cm field from the vanishing cross-power spectrum at the epoch of reionization Open
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 a simple, self-consistent galaxy model to examine the reds…
View article: How Nested Bars Enhance, Modulate, and Are Destroyed by Gas Inflows
How Nested Bars Enhance, Modulate, and Are Destroyed by Gas Inflows Open
Gas flows in the presence of two independently rotating nested bars remain not fully understood but are likely to play an important role in fueling the central black hole. We use high-resolution hydrodynamical simulations with detailed mod…
View article: How Nested Bars Enhance, Modulate, and are Destroyed by Gas Inflows
How Nested Bars Enhance, Modulate, and are Destroyed by Gas Inflows Open
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 high-resolution hydrodynamical simulations with detailed m…
View article: Stellar Bars in Isolated Gas-rich Spiral Galaxies Do Not Slow Down
Stellar Bars in Isolated Gas-rich Spiral Galaxies Do Not Slow Down Open
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 interactions between the bar and the other components of galaxies, it…
View article: Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down
Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down Open
The merger at z~2 between the proto-Milky Way and the Gaia-Sausage-Enceladus (GSE) satellite shaped the present day stellar halo and possibly led to the formation of the alpha-abundance bimodality seen in the disk today. Cosmological zoom …
View article: Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down
Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down Open
Simulation snapshots accompanying "Stellar Bars in Isolated Gas-Rich Spiral Galaxies Do Not Slow Down".\n\n \n\nSnapshots are available in this directory at a ~500 Myr\n\ncadence. Snapshots are available at both lvl3 resolution and\n\nlvl4…
View article: Characterizing the 3D Kinematics of Young Stars in the Radcliffe Wave
Characterizing the 3D Kinematics of Young Stars in the Radcliffe Wave Open
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. With Gaia DR2 astrometry and spectroscopy, we analyze the 3…
View article: Fuzzy Dark Matter and the 21 cm Power Spectrum
Fuzzy Dark Matter and the 21 cm Power Spectrum Open
We model the 21 cm power spectrum across the Cosmic Dawn and the Epoch of Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression of low-mass halos in FDM models leads to a delay in the onset redshift of these epochs rel…
View article: In the Galactic Disk, Stellar [Fe/H] and Age Predict Orbits and Precise [X/Fe]
In the Galactic Disk, Stellar [Fe/H] and Age Predict Orbits and Precise [X/Fe] Open
We explore the structure of the element abundance–age–orbit distribution of the stars in the Milky Way’s low- α disk, by (re-)deriving precise [Fe/H], [X/Fe], and ages, along with orbits, for red clump stars from the apogee survey. There h…
View article: Tomography of the Cosmic Dawn and Reionization Eras with Multiple Tracers
Tomography of the Cosmic Dawn and Reionization Eras with Multiple Tracers Open
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 comprehensive understanding of the physics that led to the f…
View article: Extracting Bias Using the Cross-bispectrum: An EoR and 21 cm–[C ii]–[C ii] Case Study
Extracting Bias Using the Cross-bispectrum: An EoR and 21 cm–[C ii]–[C ii] Case Study Open
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 reionization proceeds. On large scales ( k ≲ 0.1 Mpc −1 ) this can…