Search Publications
Gaia EDR3 bright star parallax zero-point using stellar clusters
Flynn, C.; Sekhri, R.; Venville, T. +4 more
We examine the zero-point of parallaxes in the Gaia EDR3 (Early Data Release 3, Gaia Collaboration (2021a)), using stars in open and globular clusters. Our aim is to check for zero-point systematics between bright stars G < 12 (which includes some important distance scale calibrators) and faint stars G > 14, for which the parallax scale has …
A selection function toolbox for subsets of astronomical catalogues
Everall, Andrew; Boubert, Douglas
Large catalogues are ubiquitous throughout astronomy, but most scientific analyses are carried out on smaller samples selected from these catalogues by chosen cuts on catalogued quantities. The selection function of that scientific sample - the probability that a star in the catalogue will satisfy these cuts and so make it into the sample - is thu…
New XMM-Newton observations of faint, evolved supernova remnants in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +5 more
The Large Magellanic Cloud (LMC) hosts a rich population of supernova remnants (SNRs), our knowledge of which is the most complete of any galaxy. However, there remain many candidate SNRs, identified through optical and radio observations where additional X-ray data can confirm their SNR nature and provide details on their physical properties. In …
A pilot ASKAP survey for radio transients towards the Galactic Centre
Bannister, Keith W.; Kaplan, David L.; Lenc, Emil +8 more
We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering $\sim 265\, {\rm deg}^2$ (350○ ≲ l ≲ 10○, |b| ≲ 10○).…
High-resolution ALMA observations of V4046 Sgr: a circumbinary disc with a thin ring
Garufi, Antonio; Pérez, Sebastián; Casassus, Simon +8 more
The nearby V4046 Sgr spectroscopic binary hosts a gas-rich disc known for its wide cavity and dusty ring. We present high resolution (~20 mas or 1.4 au) ALMA observations of the 1.3 mm continuum of V4046 Sgr which, combined with SPHERE-IRDIS polarised images and a well-sampled spectral energy distribution (SED), allow us to propose a physical mode…
A systematic comparison of galaxy cluster temperatures measured with NuSTAR and Chandra
Wik, D. R.; Gastaldello, F.; Maughan, B. J. +2 more
Temperature measurements of galaxy clusters are used to determine their masses, which in turn are used to determine cosmological parameters. However, systematic differences between the temperatures measured by different telescopes imply a significant source of systematic uncertainty on such mass estimates. We perform the first systematic compariso…
The distribution of dust in edge-on galaxies: I. The global structure
Gontcharov, George A.; Mosenkov, Aleksandr V.; Baes, Maarten +9 more
In this first paper in a series we present a study of the global dust emission distribution in nearby edge-on spiral galaxies. Our sample consists of 16 angularly large and 13 less spatially resolved galaxies selected from the DustPedia sample. To explore the dust emission distribution, we exploit the Herschel photometry in the range 100-500 $\mu …
Melnick 33Na: a very massive colliding-wind binary system in 30 Doradus
Townsley, Leisa K.; Broos, Patrick S.; Crowther, Paul A. +2 more
We present spectroscopic analysis of the luminous X-ray source Melnick 33Na (Mk 33Na, HSH95 16) in the Large Magellanic Cloud (LMC) 30 Doradus region (Tarantula Nebula), utilizing new time-series Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph spectroscopy. We confirm Mk 33Na as a double-lined O-type spectroscopic binary with a ma…
Cometary dust analogues for physics experiments
Zhang, X.; Sierks, H.; Blum, J. +25 more
The CoPhyLab (Cometary Physics Laboratory) project is designed to study the physics of comets through a series of earth-based experiments. For these experiments, a dust analogue was created with physical properties comparable to those of the non-volatile dust found on comets. This 'CoPhyLab dust' is planned to be mixed with water and CO2
The TESS Triple-9 Catalog: 999 uniformly vetted exoplanet candidates
Kostov, Veselin B.; Colón, Knicole D.; Christiansen, Jessie L. +20 more
The Transiting Exoplanet Survey Satellite (TESS) has detected thousands of exoplanet candidates since 2018, most of which have yet to be confirmed. A key step in the confirmation process of these candidates is ruling out false positives through vetting. Vetting also eases the burden on follow-up observations, provides input for demographics studie…