Andreas Zoglauer
A5078330978- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Pulsars and Gravitational Waves Research
- Advanced Semiconductor Detectors and Materials
- Solar and Space Plasma Dynamics
- Advanced X-ray and CT Imaging
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Particle physics theoretical and experimental studies
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Neutrino Physics Research
University of California, Berkeley
2016-2025
Goddard Space Flight Center
2023-2024
United States Naval Research Laboratory
2024
Universidad Católica Santo Domingo
2023
Berkeley College
2005-2023
Clemson University
2010-2023
University of Maryland, College Park
2023
Kavli Institute for Particle Astrophysics and Cosmology
2023
Stanford University
2023
University of California, San Diego
2023
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on 2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates band from 3 to 79 keV, extending sensitivity of far beyond ∼10 keV cutoff achieved by all previous satellites. inherently low background associated with concentrating light enables probe hard sky a more than 100-fold improvement over collimated or coded mask instruments that have operated this bandpass. Using its unprecedented...
The search for diffuse non-thermal inverse Compton (IC) emission from galaxy clusters at hard X-ray energies has been undertaken with many instruments, most detections being either of low significance or controversial. Background and contamination uncertainties present in the data non-focusing observatories result lower sensitivity to IC a greater chance false detection. We 266ks NuSTAR observations Bullet cluster, detected 3-30 keV. NuSTAR's unprecedented focusing capability largely...
We report the results of a multi-band observing campaign on famous blazar 3C 279 conducted during phase increased activity from 2013 December to 2014 April, including first observations it with NuSTAR. The $\gamma$-ray emission source measured by Fermi-LAT showed multiple distinct flares reaching highest flux level in this object since beginning Fermi mission, $F(E > 100\,{\rm MeV})$ $10^{-5}$ photons cm$^{-2}$ s$^{-1}$, and doubling time scale as short 2 hours. spectrum one was very hard,...
Stellar metals shine toward our eyes only Taking a different look at familiar star may still yield surprises. Boggs et al. trained the x-ray vision of NuSTAR observatory on well-studied supernova 1987A. Core-collapse explosions such as SN 1987A produce titanium isotope, 44 Ti, whose radioactive decay yields hard emission lines. All associated with 44Ti appears to be from material moving us, none away. This implies that explosion was not symmetric. These findings help explain mechanics and...
We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations instruments, providing data from radio to very-high-energy (VHE) gamma-ray bands. NuSTAR yielded previously unattainable sensitivity 3-79 keV range, revealing that spectrum softens when source is dimmer until X-ray spectral shape saturates into a steep power law with photon index...
The distribution of elements produced in the inner-most layers a supernova explosion is key diagnostic for studying collapse massive stars. Here we present results 2.4 Ms \textit{NuSTAR} observing campaign aimed at remnant Cassiopeia A (Cas A). We perform spatially-resolved spectroscopic analyses $^{44}$Ti ejecta which use to determine Doppler shift and thus three-dimensional (3D) velocities ejecta. find an initial mass 1.54 $\pm$ 0.21 $\times 10^{-4}$ M$_{\odot}$ has day average momentum...
The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) is designed to identify and characterize gamma rays from extreme explosions accelerators. main science themes include: supermassive black holes their connections neutrinos cosmic rays; binary neutron star mergers the relativistic jets they produce; ray particle acceleration sources including Galactic supernovae; continuous monitoring of other astrophysical events over full sky in this important energy range. AMEGO-X will...
Abstract The sky at MeV energies is currently poorly explored. Here we present an innovative mission concept that builds upon the heritage of past and current missions improving sensitivity and, very importantly, angular resolution. This consists in combining a Compton telescope coded-mask telescope. We delineate motivation for such define scientific goals mission. Galactic Explorer with Coded Aperture Mask Telescope (GECCO) novel next-generation covering hard X-ray soft gamma-ray energies....
The <i>Nuclear Spectroscopic Telescope Array (NuSTAR)</i> is a NASA Small Explorer mission that will carry the first focusing hard X-ray (6 - 80 keV) telescope to orbit. <i>NuSTAR</i> offer factor 50 100 sensitivity improvement compared previous collimated or coded mask imagers have operated in this energy band. In addition, provides sub-arcminute imaging with good spectral resolution over 12-arcminute eld of view. After launch, out two-year primary science focuses on four key programs:...
Some supernovae (SNe) may be powered by the interaction of SN ejecta with a large amount circumstellar matter (CSM). However, quantitative estimates CSM mass around such SNe are missing when material is optically thick. Specifically, current estimators sensitive to uncertainties regarding density profile and velocity. Here we outline method measure thick SNe. We present new visible-light X-ray observations 2010jl (PTF 10aaxf), including first detection an in hard band using NuSTAR. The total...
We present broadband (3–78 keV) NuSTAR X-ray imaging and spectroscopy of the Crab nebula pulsar. show that while phase-averaged spatially integrated + pulsar spectrum is a power law in this energy band, resolved finds break at ∼9 keV spectral photon index torus structure with steepening characterized by ΔΓ ∼ 0.25. also confirm previously reported pulsed spectrum, quantify it broken ∼12 0.27. maps inner 100'' remnant measure size as function seven bands. These results find rate shrinkage can...
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...
We present an investigation into the effects of high-energy proton damage on charge trapping in germanium cross-strip detectors with goal accomplishing three important measurements. First, we calibrated and characterized spectral resolution a spare COSI-balloon detector order to determine intrinsic trapping, finding that electron due impurities dominates over hole undamaged detector. Second, performed two rounds irradiation quantify, for first time, rate at which traps are produced by...
The angular resolution of a telescope which detects gamma-rays via the Compton effect is fundamentally limited below few hundred keV by fact that target electrons have an indeterminable momentum inside their atoms introduces uncertainty in recoil energy electron and scattered photon. This additional component equation results Doppler broadening compared to standard for at rest. deterioration most pronounced low photon energy, high scatter angle, Z material. physical limit present even if all...
Hadron therapy for, e.g., cancer treatment requires an accurate dose deposition (total amount and location). As a consequence, monitoring is crucial for the success of treatment. Currently employed PET imaging systems are not able to provide information about deposed fast enough allow stopping in case discordance with plan. We currently investigating system based on combined Compton scattering pair creation camera capable gamma rays up 50 MeV. The would be measure complete spectrum emitted...
Sagittarius A* harbors the supermassive black hole that lies at dynamical center of our Galaxy. spends most its time in a low luminosity emission state but flares frequently infrared and X-ray, increasing up to few hundred fold brightness for hours time. The physical processes giving rise X-ray are uncertain. Here we report detection with NuSTAR observatory Summer Fall 2012 four medium amplitude energies 79 keV. For first time, clearly see power-law spectrum extends high energy, no evidence...
ABSTRACT We present the 3–8 keV and 8–24 number counts of active galactic nuclei (AGNs) identified in Nuclear Spectroscopic Telescope Array ( NuSTAR ) extragalactic surveys. has now resolved 33%–39% X-ray background band, directly identifying AGNs with obscuring columns up to <?CDATA $\sim {10}^{25}\,{\mathrm{cm}}^{-2}$?> . In softer band are general agreement those measured by XMM-Newton Chandra over flux range $5\times {10}^{-15}\,\lesssim $?> S (3–8 keV)/...