78 citations · 403 across the 20 of their papers we have counts for
20 papers
Spiral Morphology and Radial Migration: Kinematically heating, cooling, and cold
Kathryne J. Daniel, M. E. Wisz, Karen L. Masters +3
Transient spiral arms are known to drive radial redistribution of stars and thus could play a central role in shaping disk galaxies, including modifying, over time, the age, chemic…
Hot or Cold? Radial Redistribution of Stars in FIRE Simulations of Milky Way-Mass Galaxies and the Asymmetry of Inward versus Outward Migrators
Cecilia Steel, Andrew Wetzel, Rori Kang +3
Stars can radially redistribute (migrate) within galactic disks. The degree to which this occurs as dynamically `cold' (preserves orbital eccentricity) or `hot' (increases eccentri…
Wrinkles in Time. II. Stellar Age Trends in Kinematic Signatures from Transient Spiral Structure
Amy Smock, Kathryne J. Daniel, Rayna Rampalli +4
Spiral arms in the disks of galaxies like the Milky Way can generate kinematic signatures, which appear as ridges or wrinkles in action space. Such signatures have proven difficult…
Understanding the Origin and Dynamical Evolution of the Unique Open Star Cluster Berkeley 20 using FIRE Simulations
Alessa I. Wiggins, Jamie R. Quinn, Micah Oeur +11
Open clusters (OCs) act as key probes that can be leveraged to constrain the formation and evolution of the Milky Way (MW)'s disk, as each has a unique chemical fingerprint and wel…
Counterculture Stars: Slow and Retrograde Stars with Low-Alpha Disk Abundances
Carrie Filion, Michael S. Petersen, Danny Horta +3
The Milky Way is home to a thin disk that can be defined via kinematics and/or elemental abundances. The elemental abundance-defined thin disk, also called the low-alpha disk, is g…
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…
The Impact of Bars, Spirals and Bulge-Size on Gas-Phase Metallicity Gradients in MaNGA Galaxies
M. E. Wisz, Karen L. Masters, Kathryne J. Daniel +2
As galaxies evolve over time, the orbits of their constituent stars are expected to change in size and shape, moving stars away from their birth radius. Radial gas flows are also e…
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…
Wrinkles in Time -- I: Rapid Rotators Found in High Eccentricity Orbits
Rayna Rampalli, Amy Smock, Elisabeth R. Newton +2
Recent space-based missions have ushered in a new era of observational astronomy, where high-cadence photometric light curves for thousands to millions of stars in the solar neighb…
Cosmic Explorer: A Submission to the NSF MPSAC ngGW Subcommittee
Matthew Evans, Alessandra Corsi, Chaitanya Afle +73
Gravitational-wave astronomy has revolutionized humanity's view of the universe, a revolution driven by observations that no other field can make. This white paper describes an obs…
Orbital support and evolution of flat profiles of bars (shoulders)
Leandro Beraldo e Silva, Victor P. Debattista, Stuart R. Anderson +4
Many barred galaxies exhibit upturns (shoulders) in their bar major-axis density profile. Simulation studies have suggested that shoulders are supported by looped orbits, occ…
The Non-Axisymmetric Influence: Radius and Angle-Dependent Trends in a Barred Galaxy
Carrie Filion, Rachel L. McClure, Martin D. Weinberg +2
Many disc galaxies host galactic bars, which exert time-dependent, non-axisymmetric forces that can alter the orbits of stars. There should be both angle and radius-dependence in t…
The pattern speeds of vertical breathing waves
Tigran Khachaturyants, Victor P. Debattista, Soumavo Ghosh +2
We measure and compare the pattern speeds of vertical breathing, vertical bending, and spiral density waves in two isolated N-body+SPH simulations, using windowed Fourier transform…
When Cold Radial Migration is Hot: Constraints from Resonant Overlap
Kathryne J. Daniel, David A. Schaffner, Fiona McCluskey +2
It is widely accepted that stars in a spiral disk, like the Milky Way's, can radially migrate on order a scale length over the disk's lifetime. With the exception of cold torquing,…
Constraints on Radial Migration in Spiral Galaxies - II. Angular momentum distribution and preferential migration
Kathryne J. Daniel, Rosemary F. G. Wyse
The orbital angular momentum of individual stars in galactic discs can be permanently changed through torques from transient spiral patterns. Interactions at the corotation resonan…
An Approximate Analytic Model of a Star Cluster with Potential Escapers
Kathryne J. Daniel, Douglas C. Heggie, Anna Lisa Varri
In the context of a star cluster moving on a circular galactic orbit, a "potential escaper" is a cluster star that has orbital energy greater than the escape energy, and yet is con…
Constraints on Radial Migration in Spiral Galaxies I. Analytic Criterion for Capture at Corotation
Kathryne J. Daniel, Rosemary F. G. Wyse
Near the corotation resonance of a transient spiral arm, stellar orbital angular momenta may be changed without inducing significant kinematic heating, resulting in what has come t…
Gemini Deep Deep Survey VI: Massive Hdelta-strong galaxies at z=1
Damien Le Borgne, Roberto Abraham, Kathryne Daniel +11
We show that there has been a dramatic decline in the abundance of massive galaxies with strong Hdelta stellar absorption lines from z=1.2 to the present. These ``Hdelta-strong'',…
Simultaneous Chandra and VLA Observations of Young Stars and Protostars in rho Ophiuchus Cloud Core A
Marc Gagne, Stephen L. Skinner, Kathryne J. Daniel
A 96-ks Chandra X-ray observation of rho Ophiuchus cloud core A detected 87 sources, of which 60 were identified with counterparts at other wavelengths. The X-ray detections includ…
Chandra Observations of the Pleiades Open Cluster: X-ray Emission from Late-B to Early-F Type Binaries
Kathryne J. Daniel, Jeffrey L. Linsky, Marc Gagne
We present the analysis of a 38.4 ks and a 23.6 ks observation of the core of the Pleiades open cluster. The Advanced CCD Imaging Spectrometer on board the Chandra X-ray Observator…