A5087865088- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Spacecraft Design and Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Radiation Detection and Scintillator Technologies
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Molecular Spectroscopy and Structure
- Advanced Semiconductor Detectors and Materials
- Infrared Target Detection Methodologies
- Superconducting and THz Device Technology
- Particle physics theoretical and experimental studies
- Calibration and Measurement Techniques
- Spacecraft and Cryogenic Technologies
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Parallel Computing and Optimization Techniques
- Advancements in Battery Materials
- CCD and CMOS Imaging Sensors
University of California, Berkeley
2021-2024
Center for Astrophysics Harvard & Smithsonian
2021
University of Iowa
2019-2021
We present measurements of the afterglow signatures in NaI(Tl) and CsI(Tl) detector modules as part Background Transient Observer (BTO) mission trade-study. BTO is a NASA Student Collaboration Project flying on Compton Spectrometer Imager (COSI) Small Explorer 2027. The detectors utilized this study are cylindrical shape with height diameter 5.1 cm were read out by silicon photomultipliers (SiPMs). conducted radiation campaign at HIMAC accelerator Japan where scintillators irradiated 230...
The Compton Spectrometer and Imager (COSI) is a NASA Small Explorer (SMEX) satellite mission in development with planned launch 2027. COSI wide-field gamma-ray telescope designed to survey the entire sky at 0.2-5 MeV. It provides imaging, spectroscopy, polarimetry of astrophysical sources, its germanium detectors provide excellent energy resolution for emission line measurements. Science goals include studies 0.511 MeV from antimatter annihilation Galaxy, mapping radioactive elements...
The soft MeV gamma-ray sky, from a few hundred keV up to several MeV, is one of the least explored regions electromagnetic spectrum. most promising technology access this energy range telescope that uses Compton scattering detect gamma rays. Going measured data all-sky images ready for scientific interpretation, however, requires well-understood detector setup and multi-step data-analysis pipeline. We have developed these capabilities Spectrometer Imager (COSI). Starting with deep...
The Compton Spectrometer and Imager (COSI) is a balloon-borne compact telescope designed to survey the 0.2-5 MeV sky. COSI's energy resolution of $\sim$0.2% at 1.8 MeV, single-photon reconstruction, wide field view make it capable studying astrophysical nuclear lines, particularly 1809 keV $\gamma$-ray line from decaying Galactic $^{26}$Al. Most $^{26}$Al originates in massive stars core-collapse supernova nucleosynthesis, but path stellar evolution models Galaxy-wide emission remains...
The Compton Spectrometer and Imager (COSI) is a NASA funded Small Explorer (SMEX) mission slated to launch in 2027. COSI will house wide-field gamma-ray telescope designed survey the entire sky 0.2-5 MeV range. Using germanium detectors, instrument provide imaging, spectroscopy, polarimetry of astrophysical sources with excellent energy resolution degree-scale localization capabilities. In addition main instrument, fly student collaboration project known as Background Transient Observer...
Abstract HaloSat is a small satellite (CubeSat) designed to map soft X-ray oxygen line emission across the sky in order constrain mass and spatial distribution of hot gas Milky Way. The goal help determine if gravitationally bound individual galaxies makes significant contribution cosmological baryon budget. was deployed from International Space Station 2018 July began routine science operations October. We describe goals design mission, on-orbit performance instrument, initial observations.
HaloSat is the first mission funded by NASA's Astrophysics Division to use CubeSat platform. Using three co-aligned silicon drift detectors, observatory measures soft (0.4 7 keV) x-ray emission from sources of diffuse such as hot, gaseous halo Milky Way. We describe design and construction science payload on reasoning behind many choices. As a direct result choices adherence best practices during construction, continues perform well after more than one year on-orbit.
The Compton Spectrometer and Imager (COSI) is a 0.2-5 MeV telescope capable of imaging, spectroscopy, polarimetry astrophysical sources. Such capabilities are made possible by COSI's germanium cross-strip detectors, which provide high efficiency, resolution spectroscopy precise 3D positioning photon interactions. Science goals for COSI include studies 0.511 emission from antimatter annihilation in the Galaxy, mapping radioactive elements nucleosynthesis, determining mechanisms source...
HaloSat is a CubeSat-class microsatellite sensitive in the 0.4 to 7.0 keV energy band and designed survey entire sky search of soft x-ray emissions from highly ionized oxygen residing halo Milky Way galaxy. Those observations will help constrain mass spatial distribution us understand if hot galactic halos constitute significant contribution overall cosmological baryon budget. We describe science instrument calibration products, including channel-to-energy transformation, resolution...
Abstract WL 17 is a young transition disk in the Ophiuchus L1688 molecular cloud complex. Even though among brightest disks and massive enough to expect dust self-scattering, it was undetected polarization down Atacama Large Millimeter/submillimeter Array’s (ALMA’s) instrument sensitivity limit. Such low fractions could indicate unresolved within beam or optically thin emission. We test latter case by combining high-sensitivity 233 GHz Stokes I data from observations with previous ALMA at...
Abstract We constrain the global parameters of Large Magellanic Cloud (LMC) by modeling first soft X-ray (0.4–6.8 keV) observations entire LMC produced in a single pointing with moderate spectral resolution HaloSat CubeSat. These data are best fit sum two thermal plasma components collisional ionization equilibrium and power law. find cool (0.210 ± 0.014 hot (0.89 0.14 components. The total luminosity is (1.08 0.14) × 10 39 erg s −1 . binaries make up large fraction emission (6.0 0.8) 38 ,...
The Compton Spectrometer and Imager (COSI) is a selected Small Explorer (SMEX) mission launching in 2027. It consists of large field-of-view telescope that will probe with increased sensitivity the under-explored MeV gamma-ray sky (0.2-5 MeV). We present current status cosipy, Python library perform spectral polarization fits, image deconvolution, all high-level analysis tasks required by COSI's broad science goals: uncovering origin Galactic positrons, mapping sites nucleosynthesis,...
The Compton Spectrometer and Imager (COSI) is a selected Small Explorer (SMEX) mission launching in 2027. It consists of large field-of-view telescope that will probe with increased sensitivity the under-explored MeV gamma-ray sky (0.2-5 MeV). We present current status cosipy, Python library perform spectral polarization fits, image deconvolution, all high-level analysis tasks required by COSI's broad science goals: uncovering origin Galactic positrons, mapping sites nucleosynthesis,...
The Compton Spectrometer and Imager (COSI) is a NASA funded Small Explorer (SMEX) mission slated to launch in 2027. COSI will house wide-field gamma-ray telescope designed survey the entire sky 0.2--5 MeV range. Using germanium detectors, instrument provide imaging, spectroscopy, polarimetry of astrophysical sources with excellent energy resolution degree-scale localization capabilities. In addition main instrument, fly student collaboration project known as Background Transient Observer...
The rise of time-domain astronomy including electromagnetic counterparts to gravitational waves, microlensing, explosive phenomena, and even astrometry with Gaia, are showing the power need for surveys high-cadence, large area, long time baselines study transient universe. A constellation SmallSats or CubeSats providing wide, instantaneous sky coverage down 21 Vega mag at optical wavelengths would be ideal addressing this need. We assembling CuRIOS-ED (CubeSats Rapid Infrared Optical...