M. J. Currie
A5081451906- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Parallel Computing and Optimization Techniques
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Advanced Data Storage Technologies
- Atmospheric and Environmental Gas Dynamics
- Radiomics and Machine Learning in Medical Imaging
- Impact of Light on Environment and Health
- Distributed and Parallel Computing Systems
- Astrophysics and Cosmic Phenomena
- Superconducting and THz Device Technology
- Particle Detector Development and Performance
- Mathematics, Computing, and Information Processing
- Gamma-ray bursts and supernovae
Rutherford Appleton Laboratory
2005-2025
University of Hawaii at Hilo
2001-2025
East Asian Observatory
2015-2024
Joint Institute for Nuclear Astrophysics
2000-2014
Royal Observatory
1997
Royal Observatory in Greenwich
1984
We present wide-field near-infrared (IR) images of the DR21/W75 high-mass star-forming region, obtained with Wide Field Camera (WFCAM) on United Kingdom Infrared Telescope. Broad-band JHK and narrow-band H2 1-0S(1) are compared to archival mid-IR from Spitzer Space Telescope, 850-μm dust-continuum maps Submillimeter Common User Bolometer Array (SCUBA). Together these data give a complete picture dynamic star formation across this extensive which includes at least four separate sites in...
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 present the first release (R1) of data from CO High-Resolution Survey (COHRS), which maps a strip inner Galactic plane in 12CO (J = 3 → 2). The are taken using Heterodyne Array Receiver Programme on James Clerk Maxwell Telescope (JCMT) Hawaii, has 14 arcsec angular resolution at this frequency. When complete, survey will cover |b| ⩽ 05 between 10° < l 65°. This covers 1025 175 and 5025 5525, 025 5025. smoothed to velocity 1 km s−1, spatial 16 achieve mean rms ∼1 K. COHRS available...
JHK photometry in the Mauna Kea Observatory (MKO) near-IR system is presented for 115 stars. Of these, 79 are UKIRT standards and 42 LCO standards. The average brightness 11.5 mag, with a range of 10 to 15. number nights each star was observed 4, internal error final results 0.011 mag. These data agree those reported by other groups 0.02 measurements used derive transformations between MKO photometric UKIRT, 2MASS systems. 2MASS-MKO scatter 0.05 mag redder stars: 2MASS-J includes H2O...
We present Herschel observations from the Gould Belt Survey and SCUBA-2 science verification JCMT of B1 clump in Perseus molecular cloud. determined dust emissivity index using four different techniques to combine PACS+SPIRE data at 160–500 μm with 450 850 μm. Of our techniques, we found that most robust method was filtering out large-scale emission bands match spatial scales recovered by reduction pipeline. Using this method, find β ≈ 2 toward filament region moderately dense material lower...
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...
We present evidence for a correlation between the curvatures of surface brightness profiles dwarf elliptical (dE) galaxies and their intrinsic luminosities (for objects with similar stellar populations), based on both Local Group (LG) Fornax cluster (FC) galaxies. As profile shapes are invariant distance, this can be used as distance indicator. A comparison LG FC dEs yields |$13.8^{+2.2}_{-1.8}$| Mpc FC.
We define the molecular cloud properties of Milky Way first quadrant using data from JCMT CO(3-2) High Resolution Survey. apply Spectral Clustering for Interstellar Molecular Emission Segmentation (SCIMES) algorithm to extract objects full-resolution dataset, creating catalog clouds with a large dynamic range in spatial scale. identify $>85\,000$ two clear sub-samples: $\sim35\,500$ well-resolved and $\sim540$ well-defined distance estimations. Only 35% cataloged (as well as total flux...
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...
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...
CO, 13CO, and C18O J = 3–2 observations are presented of the Ophiuchus molecular cloud. The 13CO emission is dominated by Oph A clump, B1, B2, C, E, F, regions. optically thin(ner) line used as a column density tracer, from which gravitational binding energy estimated to be 4.5 × 1039 (2282 M⊙ km2 s−2). turbulent kinetic 6.3 1038 (320 s−2), or seven times less than this, therefore cloud whole gravitationally bound. 30 protostars were searched for high-velocity gas, with 8 showing outflows,...
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...
Abstract We present <?CDATA $\mathrm{HCN}\ J=4\to 3$?> and ${\mathrm{HCO}}^{+}\ maps of six nearby star-forming galaxies, NGC 253, 1068, IC 342, M82, M83, 6946, obtained with the James Clerk Maxwell Telescope as part MALATANG survey. All galaxies were mapped in central 2′ × region at 14″ (FWHM) resolution (corresponding to linear scales ∼0.2–1.0 kpc). The L IR – ′ dense relation, where gas is traced by emission, measured our sample spatially resolved found follow correlation established...
We present the JCMT Gould Belt Survey's first look results of southern extent Orion A Molecular Cloud ($\delta \leq -5\mathrm{:}31\mathrm{:}27.5$). Employing a two-step structure identification process, we construct individual catalogues for large-scale regions significant emission labelled as islands and smaller-scale subregions called fragments using 850 $\mu$m continuum maps obtained SCUBA-2. calculate object masses, sizes, column densities, concentrations. discuss fragmentation in terms...
The latest generation of high-angular-resolution unbiased Galactic plane surveys in molecular-gas tracers are enabling the interiors molecular clouds to be studied across a range environments. CHIMPS survey simultaneously mapped sector inner plane, within 27.8 < l 46.2 deg and |b| 0.5 deg, 13CO C18O (3-2) at 15 arcsec resolution. combination data with 12CO from COHRS has enabled us perform voxel-by-voxel local-thermodynamic-equilibrium analysis, determining excitation temperature, optical...
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...
Abstract The external environments surrounding molecular clouds vary widely across galaxies such as the Milky Way, and statistical samples of are required to understand them. We present Perseus Arm Molecular Survey (PAMS), a James Clerk Maxwell Telescope (JCMT) survey combining new archival data molecular-cloud complexes in outer spiral arm 12CO, 13CO, C18O (J=3–2). With area ∼8 deg2, PAMS covers well-known W3, W5, NGC 7538 with two fields at ℓ ≈ 110○ 135○. has an effective resolution 17...
Abstract We present new JCMT SCUBA-2 observations of the Galactic Center region from and , covering 10 × 2 square degrees along Plane to a depth 43 mJy beam −1 at 850 μ m 360 450 m. describe mapping strategy reduction method used. 12 CO(3-2) selected regions in field. derive molecular-line conversion factors (mJy per K km s ) m, which are then used obtain amount contamination continuum maps due emission band. Toward fields where CO has been accounted for, we an CO-corrected compact source...
With the advent of modern multidetector heterodyne instruments that can result in observations generating thousands spectra per minute it is no longer feasible to reduce these data as individual spectra. We describe automated reduction procedure used generate baselined cubes from obtained at James Clerk Maxwell Telescope (JCMT). The system automatically detect baseline regions and determine regridding parameters, all without input a user. Additionally, remove suffering transient interference...
We present a comparison of SCUBA-2 850-$\mu$m and Herschel 70--500-$\mu$m observations the L1495 filament in Taurus Molecular Cloud with goal characterising Gould Belt Survey (GBS) data set. identify characterise starless cores three sets: 850-$\mu$m, 250-$\mu$m, 250-$\mu$m spatially filtered to mimic data. detects only highest-surface-brightness sources, principally detecting protostellar sources embedded filaments, while is sensitive most cloud structure, including extended...
The latest generation of Galactic-plane surveys is enhancing our ability to study the effects galactic environment upon process star formation. We present first data from CO Heterodyne Inner Milky Way Plane Survey 2 (CHIMPS2). CHIMPS2 a survey that will observe Galaxy, Central Molecular Zone (CMZ), and section Outer Galaxy in $^{12}$CO, $^{13}$CO, C$^{18}$O $(J = 3\rightarrow2)$ emission with Array Receiver Program on James Clerk Maxwell Telescope (JCMT). presented here are look towards CMZ...
We present L'and M' photometry, obtained at UKIRT using the Mauna Kea Observatories Near-IR filter set, for 46 and 31 standard stars, respectively. The L' standards include 25 from in-house "Bright Standards" with magnitudes deriving Elias et al. (1982) observations IRTF in early 1980s, 21 fainter stars. derive results of Sinton & Tittemore (1984). estimate average external error to be 0.015 mag bright 0.025 standards, 0.026 standards. new provide a network homogeneously observed...
The bimodal velocity distribution of the galaxies in Centaurus cluster (|$\alpha=12^\text h47^\text m,\enspace \delta=-41^\circ$|) is discussed. mean heliocentric velocities and line-of-sight dispersions two main components, within 3○ centre, are 3041, |$586\enspace\text {km}\enspace \text s^{-1}$| (denoted Cen 30) 4570, |$262\enspace\text 45) respectively. 30 dominant, having about 2.5×the population 45. Each major components has a large elliptical galaxy lying at its dynamical centre;...