D. Ward‐Thompson
A5010043817- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Advanced Combustion Engine Technologies
- Advanced Chemical Physics Studies
- Superconducting and THz Device Technology
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Atomic and Molecular Physics
- Space Exploration and Technology
- Spacecraft and Cryogenic Technologies
- Calibration and Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
University of Central Lancashire
2016-2025
Cardiff University
2007-2018
Université de Bordeaux
2015
Lancaster University
2015
European Southern Observatory
2014
McMaster University
2014
National Research Council Canada
2014
California University of Pennsylvania
2014
Canadian Institute for Advanced Research
2014
Institut d'Astrophysique Spatiale
2014
view Abstract Citations (1129) References (94) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Submillimeter Continuum Observations of rho Ophiuchi A: The Candidate Protostar VLA 1623 and Prestellar Clumps Andre, Philippe ; Ward-Thompson, Derek Barsony, Mary continuum mapping the Rho A cloud core reveals four compact clumps with masses less than about 1 solar mass embedded in an arcshaped ridge total 15 solar, lying at edge H II region around B3 star S1....
We summarize the first results from Gould Belt survey, obtained toward Aquila Rift and Polaris Flare regions during 'science demonstration phase' of Herschel. Our 70-500 micron images taken in parallel mode with SPIRE PACS cameras reveal a wealth filamentary structure, as well numerous dense cores embedded filaments. Between ~ 350 500 prestellar 45-60 Class 0 protostars can be identified field, while unbound starless no are observed field. The core mass function (CMF) derived for region...
We provide a first look at the results of Herschel Gould Belt survey toward IC5146 molecular cloud and present preliminary analysis filamentary structure in this region. The column density map, derived from our 70-500 micron data, reveals complex network filaments, confirms that these filaments are main birth sites prestellar cores. analyze profiles 27 show underlying radial fall off as r^{-1.5} to r^{-2.5} large radii. Our result is seem be characterized by narrow distribution widths having...
We present first results from the Herschel Gould Belt survey for B211/L1495 region in Taurus molecular cloud. Thanks to their high sensitivity and dynamic range, images reveal structure of dense, star-forming filament B211 with unprecedented detail, along presence striations perpendicular generally oriented magnetic field direction as traced by optical polarization vectors. Based on column density dust temperature maps derived data, we find that radial profile approaches a power-law behavior...
Results are presented of a submillimetre continuum survey 21 Myers cores that have no known infrared (near-IR or IRAS) associations – the so-called ‘starless cores’. |$^{13}{\rm CO}$| maps show 17 structure in form one more clumps, with significant departures from spherical symmetry. The clumps were surveyed continuum, but only 12 detected. In all cases than clump each was detected matter how many it contained. Five mapped to demonstrate they true emission peaks. peaks not always exactly...
For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger subsequent star formation. However, hydrodynamic models radiation and gravity show that UV-illumination has little no impact on the global dynamical evolution of cloud. The Rosette cloud, irradiated NGC2244 cluster, is a template region for triggered star-formation, we investigated its spatial density structure...
Thermal images of cold dust in the Central Molecular Zone Milky Way, obtained with far-infrared cameras on board Herschel satellite, reveal a ∼3 × 107 M☉ ring dense and clouds orbiting Galactic center. Using simple toy model, an elliptical shape having semi-major axes 100 60 pc is deduced. The major axis this inclined by about 40° respect to plane sky oriented perpendicular Bar. appears trace system stable x2 orbits predicted for barred potential. Sgr A⋆ displaced geometrical center symmetry...
The origin and possible universality of the stellar initial mass function (IMF) is a major issue in astrophysics. One main objectives Herschel Gould Belt Survey to clarify link between prestellar core (CMF) IMF. We present discuss derived from data for large population cores discovered with SPIRE PACS Aquila Rift cloud complex at d ~ 260 pc. detect total 541 starless entire ~11 deg^2 area field imaged 70-500 micron SPIRE/PACS. Most these appear be gravitationally bound, thus nature. Our...
(Abridged) We present the first public release of high-quality data products (DR1) from Hi-GAL, {\em Herschel} infrared Galactic Plane Survey. Hi-GAL is keystone a suite continuum surveys near-IR to radio, and covers five wavebands at 70, 160, 250, 350 500 micron, encompassing peak spectral energy distribution cold dust for 8 < T 50K. This inner Milky Way in longitude range 68{\deg} > l -70{\deg} |b|<1{\deg} latitude strip. Photometric maps have been produced with ROMAGAL pipeline, that...
A key parameter to the description of all star formation processes is density structure gas. In this Letter, we make use probability distribution functions (PDFs) Herschel column maps Orion B, Aquila, and Polaris, obtained with Gould Belt survey (HGBS). We aim understand which physical influence PDF shape, signatures. The PDFs B (Aquila) show a lognormal for low densities until AV ∼ 3 (6), power-law tail high densities, consistent ρ∝r−2 profile equivalent spherical distribution. broadened by...
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 present the results of 1.3-mm continuum mapping observations eight pre-stellar cores, taken with IRAM 30-m telescope equipped 19-channel MPIfR bolometer array. The new data, which were obtained in 'on-the-fly' mode, have higher angular resolution and sensitivity than previous surveys, reaching an rms noise level ̃ 3–9 mJy per 13-arcsec beam. study supports conclusions our James Clerk Maxwell Telescope (JCMT) survey suggests that, contrast some theoretical predictions, most cores flat...
Our PACS and SPIRE images of the Aquila Rift part Polaris Flare regions, taken during science demonstration phase <i>Herschel<i/> discovered fascinating, omnipresent filamentary structures that appear to be physically related compact cores. We briefly describe a new multi-scale, multi-wavelength source extraction method used detect objects measure their parameters in our images. All extracted starless cores (541 302 Polaris) form long very narrow filaments. With its combination far-IR...
We present the initial highlights of HOBYS key program, which are based on <i>Herschel<i/> images Rosette molecular complex and maps RCW120 H ii region. Using both SPIRE at 250/350/500 <i>μ<i/>m PACS 70/160 or 100/160 <i>μ<i/>m, survey provides an unbiased complete census intermediate- to high-mass young stellar objects, some not detected by <i>Spitzer<i/>. Key core properties, such as bolometric luminosity mass (as derived from spectral energy distributions), used constrain their...
Observations have been carried out with SCUBA at the JCMT of 52 molecular cloud cores that do not contain any sign protostellar activity. These are all therefore candidate prestellar cores, which believed to represent stage star formation precedes a protostar. 29 were detected 850 microns varying levels signal-to-noise ratio greater than 3 sigma peak. The split into 'bright' and `intermediate' depending on their peak flux density microns. Cores densities 170 mJy/beam designated (13 cores),...
We have conducted a Galactic plane survey of methanol masers at 6668 MHz using seven-beam receiver on the Parkes telescope. Here we present results from first part, which provides sensitive unbiased coverage large region around Centre. Details are given for 183 maser sites in longitude range 345° through Centre to 6°. Within 6° Centre, found 88 sites, more than half (48) new discoveries. The confined narrow latitude range, indicative many sources distance and beyond, thin disc population;...
We present the first Herschel PACS and SPIRE results of Vela C molecular complex in far-infrared submillimetre regimes at 70, 160, 250, 350, 500 um, spanning peak emission cold prestellar or protostellar cores. Column density multi-resolution analysis (MRA) differentiates into five distinct sub-regions. Each sub-region displays differences their column temperature probability distribution functions (PDFs), particular, PDFs `Centre-Ridge' `South-Nest' sub-regions appear stark contrast to each...
We present a power spectrum analysis of the Herschel-SPIRE observations Polaris flare, high Galactic latitude cirrus cloud midway between diffuse and molecular phases. The SPIRE images flare reveal for first time structure interstellar medium down to 0.01 parsec over 10 square degrees region. These exceptional highlight highly filamentary clumpy even in regions map. shows that is well described by single law with an exponent -2.7 +- 0.1 at all scales from 30" 8 degrees. That slope dust...
Abstract We have re-analysed all of the Submillimetre Common User Bolometer Array (SCUBA) archive data Orion star-forming regions. put together taken at different times by groups. Consequently, we constructed deepest submillimetre maps these regions ever made. There are four that been mapped: A North and South, B South. find two regions, North, deeper sensitivity completeness limits, contain a larger number sources, so concentrate on two. compare with from Spitzer Space Telescope to...
This paper describes a James Clerk Maxwell Telescope (JCMT) legacy survey that has been awarded roughly 500 hr of observing time to be carried out from 2007 2009. In this survey, we will map with SCUBA‐2 (Submillimetre Common‐User Bolometer Array 2) almost all the well‐known low‐mass and intermediate‐mass star‐forming regions within 0.5 kpc are accessible JCMT. Most these locations associated Gould Belt. From observations, produce flux‐limited snapshot star formation near Sun, providing...
A new seven-beam 6–7 GHz receiver has been built to survey the Galaxy and Magellanic Clouds for newly forming high-mass stars that are pinpointed by strong methanol maser emission at 6668 MHz. The was jointly constructed Jodrell Bank Observatory (JBO) Australia Telescope National Facility (ATNF) allows simultaneous coverage 6035 It successfully commissioned Parkes in 2006 January is now being used conduct Parkes–Jodrell multibeam of Milky Way. This will be first systematic entire Galactic...
Hi-GAL is a large-scale survey of the Galactic plane, performed with Herschel in five infrared continuum bands between 70 and 500 $\mu$m. We present band-merged catalogue spatially matched sources their properties derived from fits to spectral energy distributions (SEDs) heliocentric distances, based on photometric catalogs presented Molinari et al. (2016a), covering portion plane $-71.0^{\circ}< \ell < 67.0^{\circ}$. The contains 100922 regular SED, 24584 which show $\mu$m counterpart are...
In order to characterise the cloud structures responsible for formation of high-mass stars, we present Herschel observations DR21 environment. Maps column density and dust temperature unveil structure ridge several connected filaments. The has densities higher than 1023 cm-2 over a region 2.3 pc2. It shows substructured profiles branches into two major filaments in north. masses range between 130 1400 M⊙, whereas mass is 15 000 M⊙. accretion these onto ridge, suggested by previous molecular...
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...