Search Publications
A machine learning classifier for microlensing in wide-field surveys
Bachelet, E.; Street, R. A.; Narayan, G. +1 more
While microlensing is very rare, occurring on average once per million stars observed, current and near-future surveys are coming online with the capability of providing photometry of almost the entire visible sky to depths up to R ∼22 mag or fainter every few days, which will contribute to the detection of black holes and exoplanets through follo…
CHO-Bearing Molecules in Comet 67P/Churyumov-Gerasimenko
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +10 more
In 2004, the Rosetta spacecraft was sent to comet 67P/Churyumov-Gerasimenko for the first ever long-term investigation of a comet. After its arrival in 2014, the spacecraft spent more than two years in immediate proximity to the comet. During these two years, the ROSINA Double Focusing Mass Spectrometer (DFMS) onboard Rosetta discovered a coma wit…
Consistent dust and gas models for protoplanetary disks. IV. A panchromatic view of protoplanetary disks
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +17 more
Context. Consistent modeling of protoplanetary disks requires the simultaneous solution of both continuum and line radiative transfer, heating and cooling balance between dust and gas and, of course, chemistry. Such models depend on panchromatic observations that can provide a complete description of the physical and chemical properties and energy…
Detecting dark matter cores in galaxy clusters with strong lensing
Andrade, Kevin E.; Minor, Quinn; Kaplinghat, Manoj +1 more
We test the ability of strong lensing data to constrain the size of a central core in the dark matter haloes of galaxy clusters, using Abell 611 as a prototype. Using simulated data, we show that modelling a cluster halo with ellipticity in the gravitational potential can bias the inferred mass and concentration, which may bias the inferred centra…
Probing the Gas Content of Late-stage Protoplanetary Disks with N2H+
Zhang, Ke; Bergin, Edwin A.; Huang, Jane +5 more
The lifetime of gas in circumstellar disks is a fundamental quantity that informs our understanding of planet formation. Studying disk gas evolution requires measurements of disk masses around stars of various ages. Because H2 gas is unobservable under most disk conditions, total disk masses are based on indirect tracers such as sub-mm …
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…