Search Publications
Hydrodynamic simulation of Cygnus OB2: the absence of a cluster wind termination shock
Sander, A. A. C.; Ramachandran, V.; Larkin, C. J. K. +3 more
We perform a large-scale hydrodynamic simulation of a massive star cluster whose stellar population mimics that of the Cygnus OB2 association. The main-sequence stars are first simulated during 1.6 Myr, until a quasi-stationary state is reached. At this time, the three Wolf-Rayet stars observed in Cygnus OB2 are added to the simulation, which cont…
Spectroscopic triples and a chance alignment: a solution for the problem of suspicious mass ratios for SB2s from Wilson method
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei
We selected three double-lined spectroscopic binary systems which have extreme mass ratios, if measured using the Wilson method. We analysed medium resolution spectroscopic observations and space-based photometry and find that all these systems are not SB2, but rather triple systems and a chance alignment of another star with SB1 that have an unse…
CURLING - I. The influence of point-like image approximation on the outcomes of cluster strong lens modelling
Li, Jiadong; Kneib, Jean-Paul; Acebron, Ana +11 more
Cluster-scale strong lensing is a powerful tool for exploring the properties of dark matter and constraining cosmological models. However, due to the complex parameter space, pixelized strong lens modelling in galaxy clusters is computationally expensive, leading to the point-source approximation of strongly lensed extended images, potentially int…
A high-energy study of the supernova remnant G296.5+10.0
Combi, J. A.; García, F.; Luque-Escamilla, P. L. +6 more
We report a detailed multi-wavelength study of the supernova remnant G296.5+10.0 using archival data from XMM-Newton and Fermi-LAT complemented with ATCA observations. In the X-ray band, we performed an adaptive smoothing on the double background subtracted images to construct an X-ray mosaic map with six individual observations. Below 2.0 keV, G2…
A massive multiphase plume of gas in Abell 2390's brightest cluster galaxy
Fabian, A. C.; Combes, F.; Salomé, P. +6 more
We present new ALMA CO(2-1) observations tracing $2.2 \times 10^{10}\, \textnormal {M}_{\odot }$ of molecular gas in Abell 2390's brightest cluster galaxy, where half the gas is located in a one-sided plume extending 15 kpc out from the galaxy centre. This molecular gas has a smooth and positive velocity gradient, and is receding 250 km s-1
Oxygen abundance of γ Vel from [O III] 88 µm Herschel/PACS spectroscopy
Hillier, D. J.; Morris, P. W.; Barlow, M. J. +4 more
We present Herschel PACS spectroscopy of the [O III] 88.4 µm fine-structure line in the nearby WC8+O binary system γ Vel to determine its oxygen abundance. The critical density of this line corresponds to several 105R* such that it is spatially extended in PACS observations at the 336 pc distance to γ Vel. Two approache…
ICECUBE AGN neutrino candidate PKS 1717+177: dark deflector bends nuclear jet
Popović, L. Č.; Britzen, S.; Zajaček, M. +8 more
The BL Lac object PKS 1717+177 has been identified as potential neutrino-emitting active galactic nuclei in the point source stacking analysis of ICECUBE data. We explore peculiarities in the morphology and kinematics of the jet and examine multiwavelength light curves for distinctive effects which might allow to pinpoint a likely neutrino generat…
Testing theories of accretion and gravity with super-extremal Kerr discs
Ingram, Adam; Mummery, Andrew; Balbus, Steven
Fitting the thermal continuum emission of accreting black holes observed across X-ray bands represents one of the principle means of constraining the properties (mass and spin) of astrophysical black holes. Recent 'continuum fitting' studies of Galactic X-ray binaries in the soft state have found best-fitting dimensionless spin values which run in…
ALMA follow-up of 3000 red-Herschel galaxies: the nature of extreme submillimetre galaxies
Zavala, Jorge A.; Hughes, David H.; Aretxaga, Itziar +2 more
We present the analysis of over 3000 red-Herschel sources (
Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with TESS and CHEOPS
Vanderburg, Andrew; López-Morales, Mercedes; Latham, David W. +33 more
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar system with one of the lowest stellar activity levels known for M-dwarfs. A planet candidate was detected by TESS based on on…