D. S. Berry
A5042131634- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Atmospheric Ozone and Climate
- Superconducting and THz Device Technology
- Distributed and Parallel Computing Systems
- Adaptive optics and wavefront sensing
- Molecular Spectroscopy and Structure
- Space Satellite Systems and Control
- Calibration and Measurement Techniques
- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Mathematics, Computing, and Information Processing
- Radio Astronomy Observations and Technology
- Historical Astronomy and Related Studies
- Space Exploration and Technology
University of Hawaii at Hilo
2009-2025
East Asian Observatory
2015-2024
University Hospital Southampton NHS Foundation Trust
2017-2018
Jet Propulsion Laboratory
2007-2018
University of Missouri
2015
Joint Institute for Nuclear Astrophysics
2012-2014
Joint Research Centre
2010
Leicester General Hospital
2008
Health Choice Network
2005
University of Manchester
1992-2004
SCUBA-2 is an innovative 10000 pixel bolometer camera operating at submillimetre wavelengths on the James Clerk Maxwell Telescope (JCMT). The has capability to carry out wide-field surveys unprecedented depths, addressing key questions relating origins of galaxies, stars and planets. With two imaging arrays working simultaneously in atmospheric windows 450 850 microns, vast increase count means that maps sky 100-150 times faster than previous SCUBA instrument. In this paper we present...
The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is an instrument operating on the 15-m James Clerk Maxwell Telescope, nominally consisting of 5120 bolometers in each two simultaneous imaging bands centred over 450 and 850 um. camera operated by scanning across sky recording data at a rate 200 Hz. As largest new generation multiplexed kilopixel bolometer cameras (sub)millimetre, SCUBA-2 analysis represents significant challenge. We describe production maps using Sub-Millimetre...
SCUBA-2 is a 10 000-bolometer submillimetre camera on the James Clerk Maxwell Telescope. The instrument commissioning was completed in 2011 September, and full science operations began October. To harness potential of this powerful new astronomical tool, calibration must be accurate well understood. end, algorithms for calculating line-of-sight opacity have been improved, derived atmospheric extinction relationships at both wavebands are presented. results from over 500 primary secondary...
This paper describes a new Heterodyne Array Receiver Program (HARP) and Auto-Correlation Spectral Imaging System (ACSIS) that have recently been installed commissioned on the James Clerk Maxwell Telescope. The 16-element focal-plane array receiver, operating in submillimetre from 325 to 375 GHz, offers high (three-dimensional) mapping speeds, along with significant improvements over single-detector counterparts calibration image quality. temperatures are ∼120 K across whole band, system of...
In this paper, we present the first observations of Ophiuchus molecular cloud performed as part James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) with SCUBA-2 instrument.We demonstrate methods for combining these data previous HARP CO, Herschel, and IRAM N 2 H + in order to accurately quantify properties sources Ophiuchus.We produce a catalogue all found by SCUBA-2.We separate into protostars starless cores.We list cores perform full virial analysis, including external...
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...
This paper describes the FellWalker algorithm, a watershed algorithm that segments 1-, 2- or 3-dimensional array of data values into set disjoint clumps emission, each containing single significant peak. Pixels below nominated constant level are assumed to be background pixels and not assigned any clump. is thus equivalent in purpose CLUMPFIND algorithm. However, unlike CLUMPFIND, which on basis evenly-spaced contours uses only small fraction available values, based gradient-tracing scheme...
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...
The POL-2 polarimeter for the SCUBA-2 10 000 pixel Terahertz camera on James Clerk Maxwell Telescope (JCMT) in it's late state of commissioning. Proposals have been accepted and general observing will start August 2016. has a field view 43 arcmin at both 850 450 μm focal planes. map sky band. utilizes three optical components: half wave plate two wire-grid polarizers used as calibrator analyzer covering full SCUBA-2. We describe instrument, data acquisition features/artifacts that encountered during
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...
Abstract The Submillimetre Common User Bolometer Array 2 (SCUBA-2) is the James Clerk Maxwell Telescope’s continuum imager, operating simultaneously at 450 and 850 μ m. SCUBA-2 was commissioned in 2009–2011, since that time, regular observations of point-like standard sources have been performed whenever instrument use. Expanding calibrator observation sample by an order magnitude compared to previous work, this paper we derive updated opacity relations each wavelength for a new atmospheric...
ABSTRACT The importance of O-acetyl groups to the immunogenicity Neisseria meningitidis serogroup A polysaccharide (PS) was examined in studies using human sera and mouse immunization. In 17 18 postimmunization sera, inhibition enzyme-linked immunosorbent assay indicated that majority antibodies binding PS were specific for epitopes involving groups. Studies with mice also showed an essential role groups, where serum bactericidal titers following immunization de-O-acetylated (de-O-Ac)...
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...
We present early results from the JCMT Plane Survey (JPS), which has surveyed northern inner Galactic plane between longitudes l=7 and l=63 degrees in 850-{\mu}m continuum with SCUBA-2, as part of James Clerk Maxwell Telescope Legacy programme. Data l=30 degree survey region, contains massive star-forming regions W43 G29.96, are analysed after approximately 40% observations had been completed. The pixel-to-pixel noise is found to be 19 mJy/beam, a smooth over beam area, projected equivalent...
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 the first data release of James Clerk Maxwell Telescope Plane Survey (JPS), JPS Public Release 1. is an 850-μm continuum survey six fields in northern inner Galactic plane a longitude range ℓ = 7°–63°, made with Submillimetre Common-User Bolometer Array 2. This consists emission maps regions average pixel-to-pixel noise 7.19 mJy beam−1, when smoothed over beam, and compact source catalogue containing 7813 sources. The 95 per cent completeness limits are estimated at 0.04 Jy beam−1...
Abstract We present the B -fields mapped in IRDC G34.43+0.24 using 850 μ m polarized dust emission observed with POL-2 instrument at James Clerk Maxwell telescope. examine magnetic field geometries and strengths northern, central, southern regions of filament. The overall geometry is ordered aligned closely perpendicular to filament’s main axis, particularly containing central clumps MM1 MM2, whereas MM3 north has orientations its major axis. are uniform large (POL-2 14″ SHARP 10″) small...
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 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...
Abstract We present 450 $\mu$m and 850 James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part JCMT Gould Belt Legacy Survey (GBLS). a catalogue 39 starless protostellar sources, for which we determine source temperatures masses using SCUBA-2 $\mu$m/850 flux density ratios sources with reliable detections, compare these to values determined measured by Herschel (HGBS). In keeping previous studies, find that preferentially detects...
We present 450$\mu$m and 850$\mu$m James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part JCMT Gould Belt Legacy Survey (GBLS). a catalogue 39 starless protostellar sources, for which we determine source temperatures masses using SCUBA-2 450$\mu$m/850$\mu$m flux density ratios sources with reliable detections, compare these to values determined measured by Herschel (HGBS). In keeping previous studies, find that preferentially detects...
Performing ground-based submillimetre observations is a difficult task as the measurements are subject to absorption and emission from water vapour in Earth's atmosphere time variation weather instrument stability. Removing these features other artefacts data vital process which affects characteristics of recovered astronomical structure we seek study. In this paper, explore two reduction methods for taken with Submillimetre Common-User Bolometer Array-2 (SCUBA-2) at James Clerk Maxwell...
The dust emissivity spectral index, $\beta$, is a critical parameter for deriving the mass and temperature of star-forming structures, consequently their gravitational stability. $\beta$ value dependent on various grain properties, such as size, porosity, surface composition, expected to vary grains evolve. Here we present temperature, optical depth maps clumps in Perseus Molecular Cloud determined from fitting SEDs combined Herschel JCMT observations 160 $\mu$m, 250 350 500 850 $\mu$m...