Search Publications
ALMA observation of the disruption of molecular gas in M87
Simionescu, A.; Allen, S. W.; Werner, N. +3 more
We present the results from Atacama Large Millimeter Array (ALMA) observations centred 40 arcsec (3 kpc in projection) south-east of the nucleus of M87. We report the detection of extended CO (2-1) line emission with a total flux of (5.5 ± 0.6) × 10-18 erg s-1 cm-2 and corresponding molecular gas mass M_{H_2}=(4.7 …
The radius of the quiescent neutron star in the globular cluster M13
Campana, S.; Heinke, C. O.; Cohn, H. N. +5 more
X-ray spectra of quiescent low-mass X-ray binaries containing neutron stars can be fit with atmosphere models to constrain the mass and the radius. Mass-radius constraints can be used to place limits on the equation of state of dense matter. We perform fits to the X-ray spectrum of a quiescent neutron star in the globular cluster M13, utilizing da…
The GALAH survey: accurate radial velocities and library of observed stellar template spectra
Ting, Yuan-Sen; Casey, Andrew R.; Buder, Sven +34 more
GALAH is a large-scale magnitude-limited southern stellar spectroscopic survey. Its second data release (GALAH DR2) provides values of stellar parameters and abundances of 23 elements for 342 682 stars (Buder et al.). Here we add a description of the public release of radial velocities with a typical accuracy of 0.1 km s-1 for 336 215 o…
The very faint X-ray binary IGR J17062-6143: a truncated disc, no pulsations, and a possible outflow
Altamirano, D.; Degenaar, N.; Wijnands, R. +10 more
We present a comprehensive X-ray study of the neutron star low-mass X-ray binary IGR J17062-6143, which has been accreting at low luminosities since its discovery in 2006. Analysing NuSTAR, XMM-Newton, and Swift observations, we investigate the very faint nature of this source through three approaches: modelling the relativistic reflection spectru…
Multiwavelength observations of V407 Lupi (ASASSN-16kt) - a very fast nova erupting in an intermediate polar
Ness, J. -U.; Henze, M.; Kniazev, A. +19 more
We present a detailed study of the 2016 eruption of nova V407 Lupi (ASASSN-16kt), including optical, near-infrared, X-ray, and ultraviolet data from SALT, SMARTS, SOAR, Chandra, Swift, and XMM-Newton. Timing analysis of the multiwavelength light curves shows that, from 168 d post-eruption and for the duration of the X-ray supersoft source phase, t…
High-precision multiwavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
Bouchy, F.; Magain, P.; Queloz, D. +14 more
We present 16 occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive data set, accounting for the contamination from a nearby star. We detect the therm…
SEAGLE - I. A pipeline for simulating and modelling strong lenses from cosmological hydrodynamic simulations
Crain, Robert A.; Schaye, Joop; Theuns, Tom +8 more
In this paper we introduce the SEAGLE (i.e. Simulating EAGLE LEnses) programme, which approaches the study of galaxy formation through strong gravitational lensing, using a suite of high-resolution hydrodynamic simulations, Evolution and Assembly of GaLaxies and their Environments (EAGLE) project. We introduce the simulation and analysis pipeline …
Prevalence of neutral gas in centres of merging galaxies
Srianand, R.; Gupta, N.; Dutta, R.
We present Giant Metrewave Radio Telescope and Very Large Array observations of H I 21-cm absorption in 10 z ≤ 0.2 galaxy mergers that host strong radio sources. Seven of these mergers show strong absorption [with N({H I}) ∼ 1021 - 22 cm-2, for spin temperature of 100 K and unit covering factor]. Including literature sources,…
The Hercules stream as seen by APOGEE-2 South
Bizyaev, Dmitry; Bovy, Jo; Pan, Kaike +15 more
The Hercules stream is a group of comoving stars in the solar neighbourhood, which can potentially be explained as a signature of either the outer Lindblad resonance (OLR) of a fast Galactic bar or the corotation resonance (CR) of a slower bar. In either case, the feature should be present over a large area of the disc. With the recent commissioni…
Massive stars in the hinterland of the young cluster, Westerlund 2
Monguió, M.; Herrero, A.; Wright, N. J. +4 more
An unsettled question concerning the formation and distribution of massive stars is whether they must be born in massive clusters and, if found in less dense environments, whether they must have migrated there. With the advent of wide-area digital photometric surveys, it is now possible to identify massive stars away from prominent Galactic cluste…