G. J. White
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View article: Cool Dark Gas in Cygnus X: The First Large-scale Mapping of Low-frequency Carbon Recombination Lines
Cool Dark Gas in Cygnus X: The First Large-scale Mapping of Low-frequency Carbon Recombination Lines Open
Understanding the transition from atomic gas to molecular gas is critical to explain the formation and evolution of molecular clouds. However, the gas phases involved, cold H i and CO-dark molecular gas, are challenging to directly observe…
View article: An S-shaped Filament Formed Due to Cloud–Cloud Collision in Molecular Cloud G178.28-00.61
An S-shaped Filament Formed Due to Cloud–Cloud Collision in Molecular Cloud G178.28-00.61 Open
We present compelling observational evidence supporting G178.28-00.61 as an early-stage candidate for cloud–cloud collision (CCC), with indications of the formation of an S-shaped filament, evenly separated dense cores, and young star clus…
View article: Making a volcanic point: certain subduction zones worldwide accumulate highly hazardous, pointy stratovolcanoes
Making a volcanic point: certain subduction zones worldwide accumulate highly hazardous, pointy stratovolcanoes Open
Volcanic landscapes are amongst the most breathtaking visual features on Earth. Volcano morphologies can be extremely varied, including negative-relief topographic depressions (e.g. calderas) as well as many different configurations of pos…
View article: The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region
The JCMT Gould Belt Survey: first results from the Corona Australis molecular cloud and evidence of variable dust emissivity indices in the Coronet region Open
We present 450 and 850 $\mu$m James Clerk Maxwell Telescope (JCMT) observations of the Corona Australis (CrA) molecular cloud taken as part of the JCMT Gould Belt Legacy Survey (GBLS). We present a catalogue of 39 starless and protostellar…
View article: JCMT 850 μm Continuum Observations of Density Structures in the G35 Molecular Complex
JCMT 850 μm Continuum Observations of Density Structures in the G35 Molecular Complex Open
Filaments are believed to play a key role in high-mass star formation. We present a systematic study of the filaments and their hosting clumps in the G35 molecular complex using James Clerk Maxwell Telescope SCUBA-2 850 μ m continuum data.…
View article: JCMT 850 $\micron$ continuum observations of density structures in the G35 molecular complex
JCMT 850 $\micron$ continuum observations of density structures in the G35 molecular complex Open
Filaments are believed to play a key role in high-mass star formation. We present a systematic study of the filaments and their hosting clumps in the G35 molecular complex using JCMT SCUBA-2 850 $\micron$ continuum data. We identified five…
View article: A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North
A GMRT 610 MHz radio survey of the North Ecliptic Pole (NEP, ADF-N) / Euclid Deep Field North Open
This paper presents a 610 MHz radio survey covering 1.94 deg$^2$ around the North Ecliptic Pole (NEP), which includes parts of the ${\it AKARI}$ (ADF-N) and Euclid, Deep Fields North. The median 5$\sigma$ sensitivity is 28 $\mu$Jy beam$^{-…
View article: A study of Galactic Plane <i>Planck</i> Galactic cold clumps observed by SCOPE and the JCMT Plane Survey
A study of Galactic Plane <i>Planck</i> Galactic cold clumps observed by SCOPE and the JCMT Plane Survey Open
We have investigated the physical properties of Planck Galactic Cold Clumps (PGCCs) located in the Galactic Plane, using the JCMT Plane Survey (JPS) and the SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. By ut…
View article: On the Scarcity of Dense Cores (n > 10<sup>5</sup> cm<sup>−3</sup>) in High-latitude Planck Galactic Cold Clumps
On the Scarcity of Dense Cores (n > 10<sup>5</sup> cm<sup>−3</sup>) in High-latitude Planck Galactic Cold Clumps Open
High-latitude (∣ b ∣ > 30°) molecular clouds have virial parameters that exceed 1, but whether these clouds can form stars has not been studied systematically. Using JCMT SCUBA-2 archival data, we surveyed 70 fields that target high-latitu…
View article: The LOFAR Two-metre Sky Survey: I. Survey description and preliminary data release
The LOFAR Two-metre Sky Survey: I. Survey description and preliminary data release Open
The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120–168 MHz imaging survey that will eventually cover the entire northern sky. Each of the 3170 pointings will be observed for 8 h, which, at most declinations, is sufficient to produce ~5″ …
View article: LOFAR HBA Observations of the Euclid Deep Field North (EDFN)
LOFAR HBA Observations of the Euclid Deep Field North (EDFN) Open
We present the first deep (72 hours of observations) radio image of the Euclid Deep Field North (EDFN) obtained with the LOw-Frequency ARray (LOFAR) High Band Antenna (HBA) at 144 MHz. The EDFN is the latest addition to the LOFAR Two-Metre…
View article: V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey
V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey Open
We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly polarised maps with a m…
View article: Radio detection of chemically peculiar stars with LOFAR
Radio detection of chemically peculiar stars with LOFAR Open
Context. Chemically peculiar stars are upper main sequence stars that show anomalies in their optical spectra. These anomalies suggest peculiar chemical abundances of certain elements. Some chemically peculiar stars possess strong magnetic…
View article: High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)
High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT) Open
(abridged) A complete census of planetary systems around a volume-limited sample of solar-type stars (FGK dwarfs) in the Solar neighborhood with uniform sensitivity down to Earth-mass planets within their Habitable Zones out to several AUs…
View article: Multiwavelength properties of 850-μm selected sources from the North Ecliptic Pole SCUBA-2 survey
Multiwavelength properties of 850-μm selected sources from the North Ecliptic Pole SCUBA-2 survey Open
We present the multiwavelength counterparts of 850-$\mu$m selected submillimetre sources over a 2-deg2 field centred on the North Ecliptic Pole. In order to overcome the large beam size (15 arcsec) of the 850-$\mu$m images, deep optical to…
View article: The LOFAR Two-metre Sky Survey
The LOFAR Two-metre Sky Survey Open
In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120–168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44°30′ and 1h00m…
View article: Evidence for Cold Plasma in Planetary Nebulae From Radio Observations With the LOw Frequency ARray (LOFAR)
Evidence for Cold Plasma in Planetary Nebulae From Radio Observations With the LOw Frequency ARray (LOFAR) Open
We present observations of planetary nebulae with the LOw Frequency ARray (LOFAR) between 120 and 168 MHz. The images show thermal free–free emission from the nebular shells. We have determined the electron temperatures for spatially resol…
View article: Theia: Faint objects in motion or the new astrometry frontier
Theia: Faint objects in motion or the new astrometry frontier Open
In the context of the ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study the motion of very faint objects in the Universe. Theia is primarily designed to stu…
View article: \nEvidence for Cold Plasma in Planetary Nebulae From Radio Observations With the LOw Frequency ARray (LOFAR)
\nEvidence for Cold Plasma in Planetary Nebulae From Radio Observations With the LOw Frequency ARray (LOFAR) Open
\n Contains fulltext :\n 238000.pdf (Publisher’s version ) (Open Access)\n \n Contains fulltext :\n 238000.pdf (Author’s version preprint ) (Open Access)\n
View article: Resolved spectral variations of the centimetre-wavelength continuum from the ρ Oph W photodissociation region
Resolved spectral variations of the centimetre-wavelength continuum from the ρ Oph W photodissociation region Open
Centimetre-wavelength radio continuum emission in excess of free–free, synchrotron, and Rayleigh–Jeans dust emission (excess microwave emission, EME), and often called ‘anomalous microwave emission’, is bright in molecular cloud regions ex…
View article: CHIMPS2: survey description and 12CO emission in the Galactic Centre
CHIMPS2: survey description and 12CO emission in the Galactic Centre Open
The latest generation of Galactic Plane surveys is enhancing our ability to study the effects of galactic environment upon the process of star formation. We present the first data from CO Heterodyne Inner Milky Way Plane Survey 2 (CHIMPS2)…
View article: NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2
NEPSC2, the North Ecliptic Pole SCUBA-2 survey: 850-μm map and catalogue of 850-μm-selected sources over 2 deg2 Open
We present an 850-μm mosaic map and extracted catalogue of submillimetre sources in the extended North Ecliptic Pole (NEP) region over about 2 deg2. The 850-μm map is constructed using newly obtained observations by SCUBA-2 at the East Asi…
View article: A high redshift population of galaxies at the North Ecliptic Pole
A high redshift population of galaxies at the North Ecliptic Pole Open
Context. Dusty high- z galaxies are extreme objects with high star formation rates (SFRs) and luminosities. Characterising the properties of this population and analysing their evolution over cosmic time is key to understanding galaxy evol…
View article: A high redshift population of galaxies at the North Ecliptic Pole: unveiling the main sequence of dusty galaxies
A high redshift population of galaxies at the North Ecliptic Pole: unveiling the main sequence of dusty galaxies Open
Dusty high-z galaxies are extreme objects with high star formation rates (SFRs) and luminosities. Characterising the properties of this population and analysing their evolution over cosmic time is key to understanding galaxy evolution in t…
View article: Properties of the dense core population in Orion B as seen by the <i>Herschel</i> Gould Belt survey
Properties of the dense core population in Orion B as seen by the <i>Herschel</i> Gould Belt survey Open
We present a detailed study of the Orion B molecular cloud complex ( d ~ 400 pc), which was imaged with the PACS and SPIRE photometric cameras at wavelengths from 70 to 500 μ m as part of the Herschel Gould Belt survey (HGBS). We release n…
View article: <i>Herschel</i>-HOBYS study of the earliest phases of high-mass star formation in NGC 6357
<i>Herschel</i>-HOBYS study of the earliest phases of high-mass star formation in NGC 6357 Open
Aims. To constrain models of high-mass star formation it is important to identify the massive dense cores (MDCs) that are able to form high-mass star(s). This is one of the purposes of the Herschel /HOBYS key programme. Here, we carry out …
View article: The LOFAR Two-metre Sky Survey
The LOFAR Two-metre Sky Survey Open
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120–168 MHz survey of the northern sky with diverse and ambitious science goals. Many of the scientific objectives of LoTSS rely upon, or are enhanced by, the …