Ray S. Furuya
A5090483007- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Superconducting and THz Device Technology
- Nuclear physics research studies
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Combustion Engine Technologies
- Space Exploration and Technology
- Calibration and Measurement Techniques
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
National Astronomical Observatory of Japan
1998-2024
Tokushima University
2014-2024
Subaru (Japan)
2006-2014
National Institutes of Natural Sciences
2009
Arcetri Astrophysical Observatory
2000-2007
California Institute of Technology
2004-2006
National Institute for Astrophysics
2003-2004
Misato Observatory
1999-2000
We determine the magnetic field strength in OMC 1 region of Orion A filament via a new implementation Chandrasekhar-Fermi method using observations performed as part James Clerk Maxwell Telescope (JCMT) B-Fields In Star-Forming Region Observations (BISTRO) survey with POL-2 instrument. combine BISTRO data archival SCUBA-2 and HARP to find plane-of-sky $B_{\rm pos}=6.6\pm4.7$ mG, where $\delta B_{\rm pos}=4.7$ mG represents predominantly systematic uncertainty. develop for measuring angular...
We present the first results from B-fields In STar-forming Region Observations (BISTRO) survey, using Sub-millimetre Common-User Bolometer Array 2 (SCUBA-2) camera, with its associated polarimeter (POL-2), on James Clerk Maxwell Telescope (JCMT) in Hawaii. discuss survey's aims and objectives. describe rationale behind questions which survey will aim to answer. The most important of these is role magnetic fields star formation process scale individual filaments cores dense regions. data...
We give a detailed presentation of all the data from multiepoch 22 GHz H2O maser survey mainly toward low-mass young stellar objects (YSOs) using Nobeyama 45 m telescope and Very Large Array (VLA). Our major results are already published (our Paper I). The is first complete known Class 0 sources in northern sky (δ > -35°) one most sensitive surveys ever performed. was conducted 1996 May through 1999 March over 32 periods. A total 606 observations were carried out 173 YSOs, including 36...
Abstract The dependence of the polarization fraction p on total intensity I in polarized submillimeter emission measurements is typically parameterized as ∝ − α ( ≤ 1) and used to infer dust grain alignment efficiency star-forming regions, with an index = 1 indicating near-total lack grains magnetic field. In this work, we demonstrate that non-Gaussian noise characteristics may produce apparent ∼ even data significant signal-to-noise Stokes Q , U emission, so robust angle. We present a...
Context. Molecular filaments and hubs have received special attention recently thanks to new studies showing their key role in star formation. While the (column) density velocity structures of both been carefully studied, magnetic field (B-field) properties yet be characterized. Consequently, B-fields formation evolution hub-filament systems is not well constrained. Aims. We aim understand B-field its interplay with turbulence gravity dynamical NGC 6334 filament network that harbours...
The present paper focuses on the high-mass star-forming region G16.59-0.05. Methods: Using VLBA and EVN arrays, we conducted phase-referenced observations of three most powerful maser species in G16.59-0.05: H2O at 22.2 GHz (4 epochs), CH3OH 6.7 (3 OH 1.665 (1 epoch). In addition, performed high-resolution (> 0".1), high-sensitivity (< 0.1 mJy) VLA radio continuum emission from 1.3 3.6 cm. Results: This is first work to report accurate measurements "relative" proper motions masers....
<i>Context. <i/>Among the tracers of earliest phases in massive star formation process, methanol masers have gained increasing importance. The phenomenological distinction between Class I and II is based on their spatial association with objects such as jets, cores, ultracompact Hii regions, but also believed to correspond different pumping mechanisms: radiation for masers, collisions masers. <i>Aims. <i/>We surveyed a large sample star-forming regions consists 296 sources, divided into two...
We present the results of dust emission polarization measurements Ophiuchus-B (Oph-B) carried out using Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on James Clerk Maxwell Telescope (JCMT) in Hawaii. This work is part B-fields In Star-forming Region Observations (BISTRO) survey initiated to understand role magnetic fields star formation for nearby star-forming molecular clouds. a first look at geometry and strength Oph-B. The field...
Abstract We present 850 μ m imaging polarimetry data of the ρ Oph-A core taken with Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part our ongoing survey project, <?CDATA ${\boldsymbol{B}}$?> -fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify orientation magnetic field projected on plane sky at a resolution 0.01 pc. 10 subregions distinct fractions angles in 0.2 pc core; some them can be coherent structure Oph...
We present new observations of the active star-formation region NGC 1333 in Perseus molecular cloud complex from James Clerk Maxwell Telescope B-Fields In Star-forming Region Observations (BISTRO) survey with POL-2 instrument. The BISTRO data cover entire (~1.5 pc x 2 pc) at 0.02 resolution and spatially resolve polarized emission individual filamentary structures for first time. inferred magnetic field structure is as a whole, each filament aligned different position angles relative to...
We report 850~$\mu$m dust polarization observations of a low-mass ($\sim$12 $M_{\odot}$) starless core in the $\rho$ Ophiuchus cloud, C, made with POL-2 instrument on James Clerk Maxwell Telescope (JCMT) as part JCMT B-fields In STar-forming Region Observations (BISTRO) survey. detect an ordered magnetic field projected plane sky core. The across $\sim$0.1~pc shows predominant northeast-southwest orientation centering between $\sim$40$^\circ$ to $\sim$100$^\circ$, indicating that is well...
Abstract We present 850 μ m polarization observations of the L1689 molecular cloud, part nearby Ophiuchus cloud complex, taken with POL-2 polarimeter on James Clerk Maxwell Telescope (JCMT). observe three regions L1689: clump L1689N which houses IRAS 16293-2433 protostellar system, starless SMM-16, and core L1689B. use Davis–Chandrasekhar–Fermi method to estimate plane-of-sky field strengths 366 ± 55 G in L1689N, 284 34 72 33 L1689B, for our fiducial value dust opacity. These values indicate...
Abstract We present 850 μ m polarimetric observations toward the Serpens Main molecular cloud obtained using POL-2 polarimeter on James Clerk Maxwell Telescope as part of B-fields In STar-forming Region Observations survey. These probe magnetic field morphology about 6000 au scales, which consists cores and six filaments with different physical properties such density star formation activity. Using histogram relative orientation (HRO) technique, we find that fields are parallel to in...
Abstract We report 850 μ m continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of B -fields In STar forming Regions Observations large program on James Clerk Maxwell Telescope. These data reveal a well-structured nonuniform magnetic field in 2264C and 2264D regions with prevailing orientation around 30° from north to east. Field strength estimates virial analysis major clumps indicate that is globally dominated by gravity, while...
We present the magnetic field in dense material of Central Molecular Zone (CMZ) Milky Way, traced 850 $\mu$m polarized dust emission as part James Clerk Maxwell Telescope (JCMT) B-fields In STar-forming Region Observations (BISTRO) Survey. observe a highly ordered across CMZ between Sgr B2 and C, which is strongly preferentially aligned with orbital gas flows within clouds CMZ. find that observed relative orientations are non-random at $>$99% confidence level consistent models vectors...
Abstract We present the magnetic field in dense material of Central Molecular Zone (CMZ) Milky Way, traced 850 μ m polarized dust emission as part James Clerk Maxwell Telescope B -fields STar-forming Region Observations survey. observe a highly ordered across CMZ between Sgr B2 and C that is strongly preferentially aligned with orbital gas flows within clouds CMZ. find observed relative orientations are nonrandom at >99% confidence level consistent models which vectors 30° to 3D. The...
We report on the detection of four rotating massive disks in two regions high-mass star formation. The are perpendicular to known bipolar outflows and turn out be unstable but long-lived. infer that accretion onto embedded (proto)stars must proceed through with rates ~10-2 M☉ yr-1.
Context. Theoretical scenarios propose that high-mass stars are formed by disk-mediated accretion.
We present the first high-resolution, submillimeter-wavelength polarimetric observations of -- and thus direct magnetic field morphology within dense gas Pillars Creation in M16. These 850$\,\mu$m observations, taken as part BISTRO (B-Fields Star-forming Region Observations) Survey using POL-2 polarimeter on SCUBA-2 camera James Clerk Maxwell Telescope (JCMT), show that runs along length pillars, perpendicular to, decoupled from, surrounding photoionized cloud. Using Chandrasekhar-Fermi...
Abstract We have obtained sensitive dust continuum polarization observations at 850 μ m in the B213 region of Taurus using POL-2 on SCUBA-2 James Clerk Maxwell Telescope as part B -fields STar-forming Region Observations (BISTRO) survey. These allow us to probe magnetic field ( -field) high spatial resolution (∼2000 au or ∼0.01 pc 140 pc) two protostellar cores (K04166 and K04169) one prestellar core (Miz-8b) that lie within filament. Using Davis–Chandrasekhar–Fermi method, we estimate...
Abstract Measurement of magnetic field strengths in a molecular cloud is essential for determining the criticality support against gravitational collapse. In this paper, as part JCMT BISTRO survey, we suggest new application Davis–Chandrasekhar–Fermi (DCF) method to estimate distribution OMC-1 region. We use observations dust polarization emission at 450 and 850 μ m, C 18 O (3–2) spectral line data obtained with JCMT. volume density, velocity dispersion, angle dispersion box, 40″ × (5×5...
Context.Previous interferometric observations have demonstrated that, across a distance of few 0.1 pc, the high-mass star forming region (SFR) G24.78+0.08 contains at least four distinct centers massive formation, possibly in different evolutionary stages.
Abstract We report the first high spatial resolution measurement of magnetic fields surrounding LkH α 101, part Auriga–California molecular cloud. The observations were taken with POL-2 polarimeter on James Clerk Maxwell Telescope within framework B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization thermal dust emission at 850 μ m is found to be mostly associated redshifted gas component field displays a relatively complex morphology. Two variants...
We study the HII regions associated with NGC 6334 molecular cloud observed in sub-millimeter and taken as part of B-fields In STar-forming Region Observations (BISTRO) Survey. particular, we investigate polarization patterns magnetic field morphologies these regions. Through pattern pressure calculation analyses, several bubbles indicate that gas lines have been pushed away from bubble, toward an almost tangential (to bubble) morphology. densest 6334, where morphology is similar to...