Tim Kallman
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View article: Laboratory Astrophysics Needs for X-ray Grating Spectrometers
Laboratory Astrophysics Needs for X-ray Grating Spectrometers Open
New X-ray gratings provide far higher sensitivity and resolution, but to use the capabilities, improvements are needed in measurements of wavelengths, radiative and collisional transition rates, as well as ionization and recombination cros…
View article: Detection of polarized gamma-ray emission from the Crab nebula with the Hitomi Soft Gamma-ray Detector
Detection of polarized gamma-ray emission from the Crab nebula with the Hitomi Soft Gamma-ray Detector Open
We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrometer, is capable of measuring polarization of gamma-ray pho…
View article: Hitomi observation of radio galaxy NGC 1275: The first X-ray microcalorimeter spectroscopy of Fe-Kα line emission from an active galactic nucleus
Hitomi observation of radio galaxy NGC 1275: The first X-ray microcalorimeter spectroscopy of Fe-Kα line emission from an active galactic nucleus Open
The origin of the narrow Fe-Kα fluorescence line at 6.4 keV from active galactic nuclei has long been under debate; some of the possible sites are the outer accretion disk, the broad line region, a molecular torus, or interstellar/intraclu…
View article: Hitomi X-ray observation of the pulsar wind nebula G21.5−0.9
Hitomi X-ray observation of the pulsar wind nebula G21.5−0.9 Open
We present results from the Hitomi X-ray observation of a young composite-type supernova remnant (SNR) G21.5−0.9, whose emission is dominated by the pulsar wind nebula (PWN) contribution. The X-ray spectra in the 0.8–80 keV range obtained …
View article: Glimpse of the highly obscured HMXB IGR J16318−4848 with Hitomi
Glimpse of the highly obscured HMXB IGR J16318−4848 with Hitomi Open
We report on a Hitomi observation of IGR J16318−4848, a high-mass X-ray binary system with an extremely strong absorption of NH ∼ 1024 cm−2. Previous X-ray studies revealed that its spectrum is dominated by strong fluorescence lines of Fe …
View article: Atmospheric gas dynamics in the Perseus cluster observed with Hitomi
Atmospheric gas dynamics in the Perseus cluster observed with Hitomi Open
Extending the earlier measurements reported in Hitomi collaboration (2016, Nature, 535, 117), we examine the atmospheric gas motions within the central 100 kpc of the Perseus cluster using observations obtained with the Hitomi satellite. A…
View article: Hitomi X-ray studies of giant radio pulses from the Crab pulsar
Hitomi X-ray studies of giant radio pulses from the Crab pulsar Open
To search for giant X-ray pulses correlated with the giant radio pulses (GRPs) from the Crab pulsar, we performed a simultaneous observation of the Crab pulsar with the X-ray satellite Hitomi in the 2–300 keV band and the Kashima NICT radi…
View article: Search for thermal X-ray features from the Crab nebula with the Hitomi soft X-ray spectrometer
Search for thermal X-ray features from the Crab nebula with the Hitomi soft X-ray spectrometer Open
The Crab nebula originated from a core-collapse supernova (SN) explosion observed in 1054 ad. When viewed as a supernova remnant (SNR), it has an anomalously low observed ejecta mass and kinetic energy for an Fe-core-collapse SN. Intensive…