Search Publications
The pristine dwarf-galaxy survey - III. Revealing the nature of the Milky Way globular cluster Sagittarius II
McConnachie, Alan W.; Navarro, Julio F.; Martin, Nicolas +13 more
We present a new spectroscopic study of the faint Milky Way satellite Sagittarius II. Using multiobject spectroscopy from the Fibre Large Array Multi-Element Spectrograph, we supplement the data set of Longeard et al. with 47 newly observed stars, 19 of which are identified as members of the satellite. These additional member stars are used to put…
Tracing the evolution of dust-obscured activity using sub-millimetre galaxy populations from STUDIES and AS2UDS
Scott, D.; Shirley, R.; Smail, Ian +16 more
We analyse the physical properties of 121 SNR ≥ 5 sub-millimetre galaxies (SMGs) from the STUDIES 450 µm survey. We model their UV-to-radio spectral energy distributions using MAGPHYS+photo-z and compare the results to similar modelling of 850 µm-selected SMG sample from AS2UDS, to understand the fundamental physical differences betwee…
Overdensities of submillimetre-bright sources around candidate protocluster cores selected from the South Pole Telescope survey
Greve, Thomas R.; Phadke, Kedar A.; Aravena, Manuel +21 more
We present APEX-LABOCA 870-µm observations of the fields surrounding the nine brightest high-redshift unlensed objects discovered in the South Pole Telescope's (SPT) 2500 deg2 survey. Initially seen as point sources by SPT's 1-arcmin beam, the 19-arcsec resolution of our new data enables us to deblend these objects and search for …
Telltale signs of metal recycling in the circumgalactic medium of a z 0.77 galaxy
Rigby, J. R.; Sharon, K.; Tejos, N. +15 more
We present gravitational-arc tomography of the cool-warm enriched circumgalactic medium (CGM) of an isolated galaxy ('G1') at z ≈ 0.77. Combining VLT/MUSE adaptive-optics and Magellan/MagE echelle spectroscopy, we obtain partially resolved kinematics of Mg II in absorption and [O II] in emission. The unique arc configuration allows us to probe 42 …
Exoplanet validation with machine learning: 50 new validated Kepler planets
Armstrong, David J.; Gamper, Jevgenij; Damoulas, Theodoros
Over 30 per cent of the $\sim$4000 known exoplanets to date have been discovered using 'validation', where the statistical likelihood of a transit arising from a false positive (FP), non-planetary scenario is calculated. For the large majority of these validated planets calculations were performed using the VESPA algorithm. Regardless of the stren…
Horizontal spreading of planetary debris accreted by white dwarfs
Ludwig, Hans-Günter; Gänsicke, Boris T.; Veras, Dimitri +8 more
White dwarfs with metal-polluted atmospheres have been studied widely in the context of the accretion of rocky debris from evolved planetary systems. One open question is the geometry of accretion and how material arrives and mixes in the white dwarf surface layers. Using the three-dimensional (3D) radiation hydrodynamics code CO5BOLD, …
ALMA-IRDC: dense gas mass distribution from cloud to core scales
Avison, A.; Moser, L.; Bigiel, F. +15 more
Infrared dark clouds (IRDCs) are potential hosts of the elusive early phases of high mass star formation (HMSF). Here, we conduct an in-depth analysis of the fragmentation properties of a sample of 10 IRDCs, which have been highlighted as some of the best candidates to study HMSF within the Milky Way. To do so, we have obtained a set of large mosa…
A comparative study of the strength of flickering in cataclysmic variables
Bruch, Albert
Flickering is a universal phenomenon in accreting astronomical systems that still defies detailed physical understanding. It is particularly evident in cataclysmic variables (CVs). Attempting to define boundary conditions for models, the strength of the flickering is measured in several thousand light curves of more than 100 CVs. The flickering am…
Evidence for sub-Chandrasekhar Type Ia supernovae from the last major merger
Belokurov, Vasily; Sanders, Jason L.; Man, Kai T. F.
We investigate the contribution of sub-Chandrasekhar mass Type Ia supernovae to the chemical enrichment of the Gaia Sausage galaxy, the progenitor of a significant merger event in the early life of the Milky Way. Using a combination of data from Nissen & Schuster, the GALactic Archaeology with HERMES (GALAH) Data Release 3 [with 1D non-local t…
Dynamical masses and mass-to-light ratios of resolved massive star clusters - II. Results for 26 star clusters in the Magellanic Clouds
Mateo, Mario; Reiter, Megan; Roederer, Ian U. +5 more
We present spectroscopy of individual stars in 26 Magellanic Cloud (MC) star clusters with the aim of estimating dynamical masses and V-band mass-to-light (M/LV) ratios over a wide range in age and metallicity. We obtained 3137 high-resolution stellar spectra with M2FS on the Magellan/Clay Telescope. Combined with 239 published spectros…