H. Miyasaka
A5056536327- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Advanced Semiconductor Detectors and Materials
- Nuclear Physics and Applications
- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
California Institute of Technology
2014-2023
Space Micro (United States)
2021
Jet Propulsion Laboratory
2008
Goddard Space Flight Center
2008
RIKEN
1998-2005
Saitama University
2003
Nippon Soken (Japan)
2002
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...
We present the calibration of Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray satellite. used Crab as primary effective area calibrator and constructed a piece-wise linear spline function to modify vignetting response. The achieved residuals for all off-axis angles energies, compared assumed spectrum, are typically better than ±2% up 40 keV 5%–10% above due limited counting statistics. An empirical adjustment theoretical two-dimensional point-spread (PSF) was found using several strong...
With the first direct detection of merging black holes in 2015, era gravitational wave (GW) astrophysics began. A complete picture compact object mergers, however, requires an electromagnetic (EM) counterpart. We report ultraviolet (UV) and X-ray observations by Swift Nuclear Spectroscopic Telescope ARray (NuSTAR) EM counterpart binary neutron star merger GW170817. The bright, rapidly fading emission indicates a high mass ($\approx0.03$ solar masses) wind-driven outflow with moderate...
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 <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:...
We present here the updated calibration of Nuclear Spectroscopic Telescope Array, which was performed using data on Crab accumulated over last nine years in orbit. The basis for this new contains 250 ks focused observations (imaged through optics) and 500 stray-light (SL) (not imaged optics). measured an epoch averaged spectrum SL define a canonical Γ = 2.103 ± 0.001 N 9.69 0.02 keV − 1 cm 2 s at keV, we use as our standard. This released Calibration Data Base update 20211020 provides...
ABSTRACT We present results from the first campaign of dedicated solar observations undertaken by Nuclear Spectroscopic Telescope ARray ( NuSTAR ) hard X-ray (HXR) telescope. Designed as an astrophysics mission, nonetheless has capability directly imaging Sun at HXR energies (>3 keV) with increase in sensitivity least two magnitude compared to current non-focusing telescopes. In this paper we describe scientific areas where will make major improvements on existing measurements. report...
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)/...
Abstract Spectro-Photometer for the History of Universe, Epoch Reionization, and Ices Explorer is an upcoming NASA satellite mission to study physics inflation, history galaxy formation, abundance biogenic ices in Milky Way, obtaining first all-sky spectroscopic survey at infrared wavelengths 0.75–5.0 μ m. The instrument implements HAWAII-2RG (H2RG) detectors custom-built Video8 electronics with multiple sampling features optimize H2RG noise performance, including nonsequential row reads,...
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission was launched on 2012 June 13 and is the first focusing high-energy X-ray telescope in orbit operating above ~10 keV. NuSTAR flies two co-aligned Wolter-I conical approximation optics, coated with Pt/C W/Si multilayers, combined a focal length of 10.14 meters this enables operation from 3-79 optics focus onto plane arrays, each consisting 4 CdZnTe pixel detectors, for field view 12.5 arcminutes. inherently low background associated...
We present the first sub-arcminute images of Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves hard X-ray source IGR J17456–2901 into non-thermal filaments, molecular clouds, point sources, and a previously unknown central component emission (CHXE). detects four extending detection their power-law spectra Γ ∼ 1.3–2.3 up to ∼50 keV. A morphological spectral study filaments suggests that origin may be heterogeneous, where previous studies suggested common in young pulsar wind...
We present deep (>2.4 Ms) observations of the Cassiopeia A supernova remnant with NuSTAR, which operates in 3–79 keV bandpass and is first instrument capable spatially resolving above 15 keV. find that emission not entirely dominated by forward shock nor a smooth "bright ring" at reverse shock. Instead we >15 knots near center dimmer filaments remnant's outer rim. These regions are fit unbroken power laws 15–50 bandpass, though central have steeper (Γ ∼ −3.35) spectrum than −3.06). argue...
The Nuclear Spectroscopic Telescope Array (NuSTAR) launched in June 2012, flies two conical approximation Wolter-I mirrors at the end of a 10.15-m mast. optics are coated with multilayers Pt/C and W/Si that operate from 3 to 80 keV. Since optical path is not shrouded, aperture stops used limit field view (FoV) background sources outside FoV. However, there still sliver sky (∼1.0 deg 4.0 deg) where photons may bypass altogether fall directly on detector array. We term these stray light....
We report the first hard X-ray observations with NuSTAR of BL Lac type blazar PKS 2155-304, augmented soft data from XMM-Newton and gamma-ray Fermi Large Area Telescope, obtained in April 2013 when source was a very low flux state. A joint XMM spectrum, covering energy range 0.5 - 60 keV, is best described by model consisting log-parabola component curvature beta = 0.3(+0.2,-0.1) (local) photon index 3.04 +/- 0.15 at 2 power-law tail 2.2 0.4. The can be smoothly joined to quasi-simultaneous...
We present the first survey results of hard X-ray point sources in Galactic Center (GC) region by NuSTAR. have discovered 70 (3-79 keV) a 0.6 deg^2 around Sgr A* with total exposure 1.7 Ms, and 7 B2 field 300 ks. identify clear Chandra counterparts for 58 NuSTAR assign candidate remaining 19. The reaches luminosities ~4 x ~8 10^32 erg s^-1 at GC (8 kpc) 3-10 10-40 keV bands, respectively. source list includes three persistent luminous binaries likely run-away pulsar called Cannonball. New...
A rip in the MLI at exit aperture of OMA, NuSTAR optic aligned with detector focal plane module FPMA, has resulted an increased photon flux through OMA that manifested itself as a low energy excess. Overall, coverage decreased by 10%, but there is additional time-varying component, which occasionally causes opening to increase up 20%. We address problem calibration update, and this paper, we describe attributes problem, implications it on data analysis, solution.
The Nuclear Spectroscopic Telescope Array (NuSTAR) mission is the first focusing X-ray telescope in hard (3-79 keV) band. Among phenomena that can be studied this energy band, some require high time resolution and stability: rotation-powered accreting millisecond pulsars, fast variability from black holes neutron stars, bursts, more. Moreover, a good alignment of timestamps photons to UTC key for multi-instrument studies astrophysical processes. In Paper, we describe timing calibration...
We summarize significant improvements which have been achieved in the development of Astro-E2 Hard X-ray Detector (HXD-II). An expanded energy range and better resolution from progresses device materials redesigning front-end electronics. improved estimation for detector background orbit has also conducted based upon results our proton irradiation experiment. The sensitivity HXD-II can be expected to reach an order 10/sup -6/ [c s/sup -1/ keV/sup cm/sup -2/].
The High-Energy X-ray Probe (HEX-P) is a probe-class next-generation high-energy mission concept that will vastly extend the reach of broadband observations. Studying 2-200 keV energy range, HEXP has 40 times sensitivity any previous in 10-80 band, and be first focusing instrument 80-200 band. A successor to Nuclear Spectroscopic Telescope Array (NuSTAR), NASA Small Explorer launched 2012, HEX-P addresses key science objectives, serve as an important complement ESA's L-class Athena mission....