A5045744752- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Particle Detector Development and Performance
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Planetary Science and Exploration
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Superconducting Materials and Applications
University of California, Berkeley
2023
Columbia University
2022-2023
University of Hawaiʻi at Mānoa
2023
Massachusetts Institute of Technology
2023
Abstract We report timing and broadband spectral analysis of a Galactic X-ray source, CXOGBS J174517.0−321356 (J1745), with 614 s periodicity. Chandra discovered the source in direction Bulge. Gong proposed that J1745 was either an intermediate polar (IP) mass ∼1 M ⊙ , or ultracompact binary (UCXB). To confirm J1745's nature, we jointly fit XMM-Newton NuSTAR spectra, ruling out UCXB origin. have developed physically realistic model considers finite magnetosphere radius, absorption from...
Lithium-drifted silicon [Si(Li)] has been used for decades as an ionizing radiation detector in nuclear, particle, and astrophysics experiments, though such detectors have frequently limited to small sizes ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${\text {few cm}^{2}}$ </tex-math></inline-formula> ) cryogenic operating temperatures. The 10-cm-diameter Si(Li) developed the General Antiparticle...
We report on XMM-Newton, NuSTAR, and NICER X-ray observations of CTCV J2056-3014, a cataclysmic variable (CV) with one the fastest-spinning white dwarfs (WDs) at P = 29.6 s. While previously classified as an intermediate polar (IP), CJ2056 also exhibits properties WZ-Sge-type CVs, such dwarf novae superoutbursts. With XMM-Newton NICER, we detected spin period up to approximately 2 keV 7-$\sigma$ significance. constrained its derivative |$\dot{P}$| < 1.8e-12 s/s after correcting for binary...
Abstract We report on XMM-Newton, NuSTAR, and NICER X-ray observations of CTCV J2056–3014, a cataclysmic variable (CV) with one the fastest-spinning white dwarfs (WDs) at P = 29.6 s. While previously classified as an intermediate polar, CJ2056 also exhibits properties WZ Sge–type CVs, such dwarf novae superoutbursts. With XMM-Newton NICER, we detected spin period up to ∼2 keV 7 σ significance. constrained its derivative <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We present the first $\textit{NuSTAR}$ X-ray observation of EF Eri, a well-known polar system. The was conducted in conjunction with $\textit{NICER}$, shortly after Eri entered high accretion state following an unprecedented period low activity lasting 26 years since 1997. detected hard emission up to 50 keV flux $1.2\times10^{-10}$ ergs s$^{-1}$ cm$^{-2}$ ($3\rm{-}50 keV$). Folded lightcurves exhibit single peak $\sim65\%$ spin modulation throughout $3\rm{-}50$ band. found no evidence QPO...
The General Antiparticle Spectrometer (GAPS) Antarctic long duration balloon mission is scheduled for launch during the austral summer of 2024-25. Its novel detection technique, based on exotic atom formation, excitation, and decay, specifically designed slow moving cosmic antiprotons antideuterons. Such antinuclei are predicted by a wide variety allowed dark matter models, as well other astrophysical theories like primordial black holes. There two main components GAPS instrument: large-area...
Lithium-drifted silicon [Si(Li)] has been used for decades as an ionizing radiation detector in nuclear, particle, and astrophysical experiments, though such detectors have frequently limited to small sizes (few cm$^2$) cryogenic operating temperatures. The 10-cm-diameter Si(Li) developed the General Antiparticle Spectrometer (GAPS) balloon-borne dark matter experiment are novel particularly their requirements of low cost, large sensitive area (~10 m$^2$ full 1440-detector array), high...
We report a broad-band analysis of Galactic X-ray source, CXOGBS J174517.0-321356 (J1745), with 614-second periodicity. Chandra discovered the source in direction Bulge. Gong (2022) proposed J1745 was either an intermediate polar (IP) mass ~1 $M_{\odot}$, or ultra-compact binary (UCXB). By jointly fitting XMM-Newton and NuSTAR spectra, we rule out UCXB origin. have developed physically realistic model that considers finite magnetosphere radius, absorption from pre-shock region, reflection WD...
Compilation of papers presented by the GAPS Collaboration at 38th International Cosmic Ray Conference (ICRC), held July 26 through August 3, 2023 in Nagoya, Japan.