A5052585646- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Particle accelerators and beam dynamics
- Astro and Planetary Science
- Advanced Measurement and Metrology Techniques
- GNSS positioning and interference
- Medical Imaging Techniques and Applications
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Atmospheric Ozone and Climate
- Atomic and Subatomic Physics Research
- Superconducting and THz Device Technology
- Particle Accelerators and Free-Electron Lasers
- Optical measurement and interference techniques
- Methane Hydrates and Related Phenomena
- Structural mechanics and materials
- Climate variability and models
- Radiopharmaceutical Chemistry and Applications
- Software System Performance and Reliability
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
National Astronomical Observatory of Japan
2006-2024
National Institutes of Natural Sciences
2020
Max Planck Society
2015
Max Planck Institute for Radio Astronomy
2015
Misato Observatory
2007
Institut de Radioastronomie Millimétrique
2006
University of Tsukuba
2003
CASA, the Common Astronomy Software Applications, is primary data processing software for Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very (VLA), frequently used also other radio telescopes. The CASA can handle from single-dish, aperture-synthesis, Long Baseline Interferometery (VLBI) One of its core functionalities to support calibration imaging pipelines ALMA, VLA, VLA Sky Survey (VLASS), Nobeyama 45m telescope. This paper presents a high-level overview basic...
Abstract In the past decade, ALMA observations of protoplanetary disks revealed various substructures including gaps and rings. Their origin may be probed through statistical studies their physical properties. We present analyses archival Band 6 continuum data 43 (39 Class II four Herbig Ae) in Taurus–Auriga region. employ a novel 2D super-resolution imaging technique based on sparse modeling to obtain images with high fidelity spatial resolution. As result, we have obtained resolutions...
Abstract We present H $_{2}$ O maser data from a survey toward IRAS sources in the Galaxy with Nobeyama 45 m telescope. This had 1$\sigma$ noise level as small 0.24 Jy, resulting one of most sensitive water-maser surveys. The maximum distance masers to be detected by our is estimated 3 kpc for $F_{\nu, \mathrm{1\,kpc}} <$ 10 Jy and those $\le F_{\nu, 100 where \mathrm{1\,kpc}}$ flux density converted at 1 kpc. For strong \ge$ could detect all Galaxy. carried out total 2229...
We estimate the polarized thermal dust emission from MHD simulations of protostellar collapse and outflow formation in order to investigate alignment outflows with magnetic fields. The polarization maps indicate that an field depends on strength inside cloud core; direction outflow, projected plane sky, is aligned preferentially mean vector for a core 80 μG, while it does not tend be 50 μG as long 1000 AU scale considered. at center probed by outflow. In addition, can revealed Atacama Large...
Abstract Based on Atacama Large Millimeter/submillimeter Array (ALMA) observations, compact protoplanetary disks with dust radii of r ≲ 20–40 au were found to be dominant in nearby low-mass star formation regions. However, their substructures have not been investigated because the limited spatial resolution achieved so far. We apply a newly developed super-resolution imaging technique utilizing sparse modeling (SpM) explore several au-scale structures such disks. SpM can directly solve for...
Abstract Spatial correlations among protoplanetary disk orientations carry unique information on physics of multiple-star formation processes. We select five nearby star-forming regions that comprise a number disks with spatially resolved images ALMA and Hubble Space Telescope, we search for the mutual alignment axes. Specifically, apply Kuiper test to examine statistical uniformity position angle (PA: major axis projected ellipse measured counterclockwise from north) distribution. The...
We present observations of the $^3P_1$-$^3P_0$ fine-structure line atomic carbon using ASTE 10 m sub-mm telescope towards RCW38, youngest super star cluster in Milky Way. The detected [CI] emission is compared with CO $J$ = 1-0 image cube presented Fukui et al. (2016) which has an angular resolution 40$^{\prime \prime}$ ($\sim$ 0.33 pc). overall distribution this similar to that $^{13}$CO emission. optical depth was found be $\tau$ 0.1-0.6, suggesting mostly optically thin An empirical...
CASA, the Common Astronomy Software Applications package, is primary data processing software for Atacama Large Millimeter/submillimeter Array (ALMA) and NSF's Karl G. Jansky Very (VLA), frequently used also other radio telescopes. The CASA can process from both single-dish aperture-synthesis telescopes, one of its core functionalities to support reduction imaging pipelines ALMA, VLA Sky Survey (VLASS). has recently undergone several exciting new developments, including an increased...
A new method that enables us to estimate the inclination of Class I young stellar objects is proposed. Since are not spherically symmetric, it likely observed feature sensitive system. Thus, we construct a protostar model by carefully treating two-dimensional radiative transfer and equilibrium. We show from present numerical simulations emergent luminosity LSED, which frequency integration spectral energy distribution (SED), depends strongly on system i, whereas peak flux insensitive i....
In the past decade, ALMA observations of protoplanetary disks revealed various substructures including gaps and rings. Their origin may be probed through statistical studies on physical properties substructures. We present analyses archival Band 6 continuum data 43 (39 Class II 4 Herbig Ae) in Taurus-Auriga region. employ a novel 2D super-resolution imaging technique based sparse modeling to obtain images with high fidelity spatial resolution. As result, we have obtained resolutions...
The amount of astronomical data that needs to be archived, calibrated, and processed continues increase as telescopes observing instruments advance. Securing necessary resources store process ever-increasing is an operational challenge. To solve these issues, we conducted a demonstration experiment using ALMA archived efficiently utilize commercial cloud for archive storage analysis pipeline processing. In archiving, hybrid configuration combining on-premise based short-term long-term...
We reformulate the gain correction problem of radio interferometry as an optimization with regularization, which is solved efficiently iterative algorithm. Combining this new method our previously proposed imaging method, PRIISM, whole process self-calibration redefined a single regularization. As result, gains are corrected, and image estimated. tested approach ALMA observation data found it provides promising results.
Abstract We reformulate the gain correction problem of radio interferometry as an optimization with regularization, which is solved efficiently iterative algorithm. Combining this new method our previously proposed imaging method, PRIISM, whole process self-calibration redefined a single regularization. As result, gains are corrected and image estimated. tested approach ALMA observation data found that it provides promising results.
We will present recent progress on a development of the Python module for Radio Interferometry Imaging with Sparse Modeling (PRIISM) and its application. PRISM is new imaging tool radio interferometry based sparse modeling approach. PRIISM aimed at an without subjectivity nor manual intervention as well platform to explore super-resolution imaging. integrates solver routine data manipulation tools provided by Common Astronomy Software Applications (CASA). As consequence this integration, we...
Abstract We present a method to mitigate the atmospheric effects (residual lines) in single-dish radio spectroscopy caused by elevation difference between target and reference positions. The is developed as script using Atmospheric Transmission at Microwaves (ATM) library built into Common Astronomy Software Applications (CASA) package. apply data taken with Total Power Array of Atacama Large Millimeter/submillimeter Array. intensities residual (mostly O 3 ) lines are suppressed by,...