M. Hattori
A5101729938- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Superconducting and THz Device Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Adaptive optics and wavefront sensing
- Pulsars and Gravitational Waves Research
- Physics of Superconductivity and Magnetism
- Spacecraft Design and Technology
- Soil Moisture and Remote Sensing
- History and Developments in Astronomy
- Infrared Target Detection Methodologies
- Advanced Antenna and Metasurface Technologies
- Gyrotron and Vacuum Electronics Research
Tohoku University
2014-2024
Japan Society for Occupational Health
2023
Tokai University
2023
Institut d'Astrophysique Spatiale
2020
High Energy Accelerator Research Organization
2020
Centre National de la Recherche Scientifique
2020
Stockholm University
2020
Université Paris-Sud
2020
University of California, San Diego
2020
Cardiff University
2020
The Simons Observatory (SO) is a new cosmic microwave background experiment being built on Cerro Toco in Chile, due to begin observations the early 2020s. We describe scientific goals of experiment, motivate design, and forecast its performance. SO will measure temperature polarization anisotropy six frequency bands: 27, 39, 93, 145, 225 280 GHz. initial configuration have three small-aperture 0.5-m telescopes (SATs) one large-aperture 6-m telescope (LAT), with total 60,000 cryogenic...
Abstract We investigate a novel scenario involving asymmetric keV-range dark matter (DM) in the form of right-handed (sterile) neutrinos. Based on Fermi-Dirac distribution, we demonstrate that fermionic DM forms Fermi degenerate gas, making it potentially colder than symmetric DM. This setup simultaneously accounts for Universe's baryon asymmetry through tiny Yukawa interactions with Standard Model leptons and Higgs field, homochirality amino acids via decay into circularly polarized...
Abstract We present a far-infrared all-sky atlas from sensitive survey using the Japanese AKARI satellite. The covers > 99% of sky in four photometric bands centred at 65 μm, 90 140 and 160 with spatial resolutions ranging 1′ to 1${^{\prime\prime}_{.}}$5. These data provide crucial information on investigation characterisation properties dusty material interstellar medium (ISM), since significant portion its energy is emitted between ∼ 50 200 μm. large-scale distribution clouds, their...
LiteBIRD [Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection] is a small to map microwave (CMB) radiation over full sky at large angular scales with unprecedented precision. Cosmological inflation, which leading hypothesis resolve problems in Big Bang theory, predicts that primordial gravitational waves were created during inflationary era. Measurements CMB are known as best probe detect waves. The working group authorized...
Recent developments of transition-edge sensors (TESs), based on extensive experience in ground-based experiments, have been making the sensor techniques mature enough for their application future satellite CMB polarization experiments. LiteBIRD is most advanced phase among such satellites, targeting its launch Japanese Fiscal Year 2027 (2027FY) with JAXA's H3 rocket. It will accommodate more than 4000 TESs focal planes reflective low-frequency and refractive medium-and-high-frequency...
Foreseeing the era of high spatial resolution measurements Sunyaev-Zel'dovich effect (SZE) in clusters galaxies, we present a prototype analysis this sort combined with Chandra X-ray data. It is applied specifically to RX J1347-1145 at z=0.451, most X-ray-luminous galaxy cluster known, for which highest SZE and images are currently available. We demonstrate that yields unique probe complex structures intracluster medium, offering determinations their temperature, density, line-of-sight...
Abstract We report on mapping observations toward the region of most luminous X-ray cluster, RX J1347$-$1145 ($ z=0.45$), through Sunyaev–Zel’dovich effect at 21 GHz and 150 with Nobeyama 45-m telescope. While a low angular resolution image (beam-size $ \sigma_\mathrm{FWHM}$ 76$ {}^{\mathrm{\prime\prime}}$) shows consistent feature ROSAT/HRI image, higher \sigma_\mathrm{FWHM} =13^{\prime\prime}$) reveals complex morphological structures cluster region, which cannot be simply described by...
We present an initial analysis of the properties all-sky image obtained by Far-Infrared Surveyor (FIS) onboard AKARI satellite, at 65~$\mu$m (N60), 90~$\mu$m (WIDE-S), 140~$\mu$m (WIDE-L),and 160~$\mu$m (N160). Absolute flux calibration was determined comparing data with COBE/DIRBE sets, and intensity range as wide from a few MJy~sr$^{-1}$ to $>$1~GJy~sr$^{-1}$. The uncertainties are considered be standard deviations respect DIRBE data, they less than 10\% for intensities above 10, 3, 25,...
LiteBIRD, the Lite (Light) satellite for study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission primordial cosmology fundamental physics. JAXA selected LiteBIRD in May 2019 as strategic large-class (L-class) mission, with its expected launch late 2020s using JAXA's H3 rocket. plans to map microwave (CMB) over full sky unprecedented precision. Its main scientific objective carry out definitive search signal inflation, either making discovery...
LiteBIRD is a planned JAXA-led CMB B-mode satellite experiment aiming for launch in the late 2020s, with primary goal of detecting imprint primordial inflationary gravitational waves. Its current baseline focal-plane configuration includes 15 frequency bands between 40 and 402 GHz, fulfilling mission requirements to detect amplitude waves total uncertainty on tensor-to-scalar ratio, $\delta r$, down r<0.001$. A key aspect this performance accurate astrophysical component separation, ability...
LiteBIRD is a next generation satellite aiming for the detection of Cosmic Microwave Background (CMB) B-mode polarization imprinted by primordial gravitational waves generated in era inflationary universe. The science goal to measure tensor-to-scaler ratio r with precision δr < 10<sup>-3</sup>♦, offering us crucial test major large-single-field slow-roll inflation models. planned conduct an all sky survey at sun-earth second Lagrange point (L2) angular resolution about 0.5...
We report on the detection of Sunyaev-Zeldovich (SZ) signals toward most luminous X-ray cluster RX J1347-1145 at Nobeyama Radio Observatory (21 and 43 GHz) with James Clerk Maxwell Telescope (350 GHz). In particular, latter is first successful SZ temperature increment in submillimeter band that resolved profile a galaxies. Both observed spectral dependence radial are fully consistent those expected from observation cluster. The combined analysis 21 350 GHz data reproduces core radius...
We have determined the physical mechanism responsible for plasma instabilities, which were first found by Ramani & Laval in 1978, associated with anisotropic velocity distributions induced a temperature gradient there are growing low-frequency transverse magnetic waves, even absence of background fields. shown that growth one modes is identical to Weibel instability. The nonlinear saturation level instability also provided considering wave-particle interactions. evolution fields after...
We present a detailed analysis of Chandra X-ray observations the lensing cluster galaxies Cl 0024+17 at z = 0.395. found that radial temperature profile is consistent with being isothermal out to ~600 kpc and average 4.47 keV. The surface brightness represented by sum extended emission centered central bright elliptical galaxy small core 50 more can be well described spherical β-model radius about 210 kpc. Assuming X-ray-emitting gas in hydrostatic equilibrium, we estimated mass within arc...
LiteBIRD is a candidate for JAXA s strategic large mission to observe the cosmic microwave background (CMB) polarization over full sky at angular scales.It planned be launched in 2020s with an H3 launch vehicle three years of observations Sun-Earth Lagrangian point (L2).The concept design has been studied by researchers from Japan, U.S., Canada and Europe during ISAS Phase-A1.Large scale measurements
Context. We present the results of our analysis long Suzaku observations (149 ks and 122 for XIS HXD, respectively) most X-ray luminous galaxy cluster, RX J1347.5–1145, at .
We have analyzed the ASCA data of 29 nearby clusters galaxies systematically, and obtained temperatures, iron abundances, X-ray luminosities their intracluster medium (ICM). also estimate ICM mass using beta model, then evaluate contained in derive total gravitating mass. This gives largest most homogeneous information about derived only by data. compare these values with those distant whose were measured ASCA, find no clear evidence evolution for at z<1.0. Only cluster z=1.0,...
High- T c superconducting Ba 2 YCu 3 O x films have been epitaxially grown on tetragonal ZrO /Si(100) substrate by rf magnetron sputtering below 700°C. The slowly-cooled sample after deposition in a chamber involving gas exhibits the transition above liquid nitrogen temperature. (onset) and (end) observed are 88 K 82 K, respectively.
We describe the development of an instrument that uses a Martin-Puplett-type Fourier-transform spectrometer to apply aperture synthesis technique millimeter and submillimeter waves. call this multi-Fourier-transform interferometer (MuFT). The MuFT performs wideband imaging, spectroscopy, polarimetry, at wavelengths. fundamentals give example one potential implementation. A full description observables with is provided. physical explanation observability complex visibility by given....