A5023055374- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
- Computational Fluid Dynamics and Aerodynamics
- Functional Brain Connectivity Studies
- Astronomical Observations and Instrumentation
- Meteorological Phenomena and Simulations
The Ohio State University
2023-2025
University of North Carolina at Chapel Hill
2020
ABSTRACT The Merian survey is mapping ∼ 850 deg2 of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on 4-m Victor M. Blanco telescope at Cerro Tololo Inter-American Observatory, goal carrying first high signal-to-noise (S/N) measurements weak gravitational lensing around dwarf galaxies. This paper presents design filter set: N708 (λc = 7080 Å, Δλ 275 Å) and N540 5400 210 Å). central wavelengths widths were designed to detect $\rm H\alpha$...
The internal structure and abundance of dark matter halos subhalos are powerful probes the nature matter. In order to compare observations with models, accurate theoretical predictions these quantities needed. We present a fast method describe tidal evolution within their parent halo, based on semianalytic approach. first consider idealized $N$-body simulations host using generalized mass density profile that describes properties in variety models at infall, including popular warm, cold,...
We report the discovery of short-period photometric variability and modulated Zeeman-split hydrogen emission in SDSSJ125230.93-023417.72 (EPIC 228939929), a variable white dwarf star observed at long cadence \textit{K2} Campaign 10. The behavior is associated with magnetic ($B=5.0$ MG) spot on stellar surface, making $317.278$-second period direct measurement rotation rate. This object therefore fastest-rotating apparently isolated (without companion) yet discovered, second found to exhibit...
ABSTRACT One necessary step for probing the nature of self-interacting dark matter (SIDM) particles with astrophysical observations is to pin down any possible velocity dependence in SIDM cross-section. Major challenges achieving this goal include eliminating, or mitigating, impact baryonic components and tidal effects within halos interest – these processes can be highly degenerate those self-interactions at small scales. In work, we select 9 isolated galaxies brightest cluster (BCGs)...
ABSTRACT Galaxy-scale strongly lensed systems have been shown to provide a unique technique for exploring the underlying physics of dark matter at sub-galactic scales. In past, much attention was given detecting and studying individual haloes in strong lens system. addition subhaloes, line-of-sight contribute significantly small perturbations images. prior work, we demonstrated that these imprint distinctive anisotropic signature hence give rise detectable non-zero parity-even quadrupole...
Self-interacting dark matter (SIDM) theory predicts that halos experience core-collapse, a process where the halo's inner region rapidly increases in density and decreases size. The N-body simulations used to study this can suffer from numerical errors when simulation parameters are selected incorrectly. Optimal choices for well studied cold (CDM), but not deeply understood self-interactions included. In order perform reliable model core-collapse accurately we must understand potential...
One necessary step for probing the nature of self-interacting dark matter (SIDM) particles with astrophysical observations is to pin down any possible velocity dependence in SIDM cross section. Major challenges achieving this goal include eliminating, or mitigating, impact baryonic components and tidal effects within halos interest -- these processes can be highly degenerate those self-interactions at small scales. In work we select 9 isolated galaxies brightest cluster (BCGs) enough such...
The Merian survey is mapping $\sim$ 850 degrees$^2$ of the Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) wide layer with two medium-band filters on 4-meter Victor M. Blanco telescope at Cerro Tololo Inter-American Observatory, goal carrying first high signal-to-noise (S/N) measurements weak gravitational lensing around dwarf galaxies. This paper presents design filter set: N708 ($\lambda_c = 7080 \unicode{x212B}$, $\Delta\lambda 275\unicode{x212B}$) and N540 5400\unicode{x212B}$,...
The internal structure and abundance of dark matter halos subhalos are powerful probes the nature matter. In order to compare observations with models, accurate theoretical predictions these quantities needed. We present a fast method describe tidal evolution within their parent halo, based on semi-analytic approach. first consider idealized N-body simulations host using generalized mass density profile that describes properties in variety models at infall, including popular warm, cold,...
We present the Merian Survey, an optical imaging survey optimized for studying physical properties of bright star-forming dwarf galaxies. is carried out with two medium-band filters ($N708$ and $N540$, centered at $708$ $540$ nm), custom-built Dark Energy Camera (DECam) on Blanco telescope. covers $\sim 750\,\mathrm{deg}^2$ equatorial fields, overlapping Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) wide, deep, ultra-deep fields. When combined HSC-SSP data ($grizy$), new DECam allows...
Dark matter halos with self-interacting dark (SIDM) experience a unique evolutionary phenomenon, in that their central regions eventually collapse to high density through the runaway gravothermal process after initially forming large and low-density core. When coupled orbital evolution, this is expected naturally produce diversity dark-matter halos' inner mass distribution, potentially explaining problem of dwarf galaxies. However, it remains unknown how SIDM propagates more easily observed...
One of the hottest questions in cosmology self-interacting dark matter (SIDM) is whether scatterings can induce detectable core-collapse halos by present day. Because gravitational tides accelerate core-collapse, most promising targets to observe are satellite galaxies and subhalo systems. However, simulating small subhalos computationally intensive, especially when start core-collapse. In this work, we a hierarchical framework for population SIDM subhalos, which reduces computation time...
Galaxy-scale strongly lensed systems have been shown to provide a unique technique for exploring the underlying physics of dark matter at sub-galactic scales. In past, much attention was given detecting and studying individual haloes in strong lens system. addition subhaloes, line-of-sight contribute significantly small perturbations images. prior work, we demonstrated that these imprint distinctive anisotropic signature hence give rise detectable non-zero parity-even quadrupole moment...