A5060325385- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Mechanics and Biomechanics Studies
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Adaptive optics and wavefront sensing
- Heat Transfer Mechanisms
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Earthquake Detection and Analysis
University of California, Los Angeles
2023-2024
UCLA Health
2023
Abstract We present the first estimate of intrinsic binary fraction young stars across central ≈0.4 pc surrounding supermassive black hole (SMBH) at Milky Way Galactic center (GC). This experiment searched for photometric variability in 102 spectroscopically confirmed stars, using 119 nights 10″ wide adaptive optics imaging observations taken W. M. Keck Observatory over 16 yr <?CDATA $K^{\prime} $?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Abstract Sgr A* is the variable electromagnetic source associated with accretion onto Galactic center supermassive black hole. While near-infrared (NIR) variability of was shown to be consistent over two decades, unprecedented activity in 2019 challenges existing statistical models. We investigate origin this by recalibrating and reanalyzing all our Keck Observatory imaging observations from 2005–2022. present light curves 69 observation epochs using NIRC2 imager at 2.12 μ m laser-guide star...
Abstract The Milky Way’s central parsec is a highly extinguished region with population of high-proper-motion stars. We have tracked 145 stars for ∼10 yr at wavelengths between 1 and 4 μ m to analyze extinction effects in color–magnitude space. Approximately 30% this sample dims reddens over the course years, likely from motion sources relative an inhomogeneous screen dust. correct previous measurements intrinsic variability fraction differential effects, resulting reduced stellar 34%....
Abstract In this work, we measure the spectral index of Sagittarius A* (Sgr A*) between H (1.6 μ m) and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>K</mml:mi> <mml:mo accent="false">′</mml:mo> </mml:math> (2.2 broadband filters in near-infrared (NIR), sampling over a factor ∼40 brightness, largest range probed to date by ∼3. Sgr A*-NIR is highly variable, studying α (with F ν ∝ ) essential determine underlying emission mechanism. For example,...
We present the first estimate of intrinsic binary fraction young stars across central $\approx$ 0.4 pc surrounding supermassive black hole (SMBH) at Milky Way Galactic center (GC). This experiment searched for photometric variability in 102 stars, using 119 nights 10"-wide adaptive optics imaging observations taken Keck Observatory over 16 years K'- and H-bands. photometrically detected three all which are situated more than 1" (0.04 pc) from SMBH one which, S2-36, is newly reported here...
Sgr A* is the variable electromagnetic source associated with accretion onto Galactic center supermassive black hole. While near-infrared (NIR) variability of was shown to be consistent over two decades, unprecedented activity in 2019 challenges existing statistical models. We investigate origin this by re-calibrating and re-analyzing all our Keck Observatory imaging observations from 2005-2022. present light curves 69 observation epochs using NIRC2 imager at 2.12 $\mu$m laser guide star...