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The ASKAP EMU Early Science Project: radio continuum survey of the Small Magellanic Cloud
Haberl, F.; Umana, G.; Filipović, M. D. +53 more
We present two new radio continuum images from the Australian Square Kilometre Array Pathfinder (ASKAP) survey in the direction of the Small Magellanic Cloud (SMC). These images are part of the Evolutionary Map of the Universe (EMU) Early Science Project (ESP) survey of the Small and Large Magellanic Clouds. The two new source lists produced from …
Globular clusters formed within dark haloes I: present-day abundance, distribution, and kinematics
Peng, Eric W.; Sales, Laura V.; Creasey, Peter +1 more
We explore a scenario where metal-poor globular clusters (GCs) form at the centres of their own dark matter haloes in the early Universe before reionization. This hypothesis leads to predictions about the abundance, distribution, and kinematics of GCs today that we explore using cosmological N-body simulations and analytical modelling. We find tha…
ComPRASS: a Combined Planck-RASS catalogue of X-ray-SZ clusters
Arnaud, M.; Melin, J. -B.; Tarrío, P.
We present the first all-sky catalogue of galaxy clusters and cluster candidates obtained from joint X-ray-SZ detections using observations from the Planck satellite and the ROSAT all-sky survey (RASS). The catalogue contains 2323 objects and has been validated by careful cross-identification with previously known clusters. This validation shows t…
Looking Deep into the Rosette Nebula’s Heart: The (Sub)stellar Content of the Massive Young Cluster NGC 2244
Cieza, Lucas A.; Schödel, Rainer; Geers, Vincent C. +5 more
As part of the ongoing effort to characterize the low-mass (sub)stellar population in a sample of massive young clusters, we have targeted the ∼2 Myr old cluster NGC 2244. The distance to NGC 2244 from Gaia DR2 parallaxes is 1.59 kpc, with errors of 1% (statistical) and 11% (systematic). We used the Flamingos-2 near-infrared camera at the Gemini-S…
Uncovering Red and Dusty Ultraluminous X-Ray Sources with Spitzer
Gehrz, Robert D.; Fürst, Felix; Walton, Dominic J. +9 more
We present a mid-infrared (IR) sample study of nearby ultraluminous X-ray sources (ULXs) using multiepoch observations with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. Spitzer/IRAC observations taken after 2014 were obtained as part of the Spitzer Infrared Intensive Transients Survey. Our sample includes 96 ULXs located within…
Massive star cluster formation and evolution in tidal dwarf galaxies
Weilbacher, Peter M.; Boquien, Médéric; de Grijs, Richard +8 more
Context. The formation of globular clusters remains an open debate. Dwarf starburst galaxies are efficient at forming young massive clusters with similar masses as globular clusters and may hold the key to understanding their formation.
Aims: We study star cluster formation in a tidal debris, including the vicinity of three tidal dwarf galaxi…
Hypotheses for the origin of the Hypanis fan-shaped deposit at the edge of the Chryse escarpment, Mars: Is it a delta?
Sefton-Nash, Elliot; Bell, James F., III; Adler, Jacob B. +4 more
We investigated the origin of the fan-shaped deposit at the end of Hypanis Valles that has previously been proposed as an ExoMars, Mars 2020, and human mission candidate landing site, and found evidence that the landform is an ancient delta. Previous work suggests that the deposit originated from a time of fluvial activity both distinct from and p…
The Detection of [O III] λ4363 in a Lensed, Dwarf Galaxy at z = 2.59: Testing Metallicity Indicators and Scaling Relations at High Redshift and Low Mass
Richard, Johan; Siana, Brian; Freeman, William R. +6 more
We present Keck/MOSFIRE (Multi-Object Spectrometer for InfraRed Exploration) and Keck/LRIS (Low Resolution Imaging Spectrometer) spectroscopy of A1689-217, a lensed (magnification ∼7.9), star-forming (SFR ∼ 16 M ⊙ yr-1), dwarf (log(M */M ⊙) = 8.07-8.59) Lyα emitter (EW0 ∼ 138 Å) at z = 2.5918.…
The solar chromosphere at millimetre and ultraviolet wavelengths. I. Radiation temperatures and a detailed comparison
De Pontieu, B.; Rezaei, R.; Carlsson, M. +3 more
Solar observations with the Atacama Large Millimeter/submillimeter Array (ALMA) provide us with direct measurements of the brightness temperature in the solar chromosphere. We study the temperature distributions obtained with ALMA Band 6 (in four sub-bands at 1.21, 1.22, 1.29, and 1.3 mm) for various areas at, and in the vicinity of, a sunspot, co…
Simulations of Ice Chemistry in Cometary Nuclei
Garrod, Robin T.
The first computational model of solid-phase chemistry in cometary nuclear ices is presented. An astrochemical kinetics model, the Model for Astrophysical Gas and Ice Chemical Kinetics And Layering, is adapted to trace the chemical evolution in multiple layers of cometary ice, over a representative period of 5 Gyr. Physical conditions are chosen a…