Search Publications
Absolute parameters of young stars: V puppis
Blackford, M. G.; Budding, E.; Banks, T. +2 more
New spectrometric data on V Pup are combined with satellite photometry [HIPPARCOS and recent Transiting Exoplanet Survey Satellite (TESS)] to allow a revision of the absolute parameters with increased precision. We find: M1 = 14.0 ± 0.5, M2 = 7.3 ± 0.3 (M⊙); R1 = 5.48 ± 0.18, R2 = 4.59 ± 0.15 …
Morphometry as a probe of the evolution of jellyfish galaxies: evidence of broadening in the surface brightness profiles of ram-pressure stripping candidates in the multicluster system A901/A902
Rodríguez Del Pino, Bruno; Chies-Santos, Ana L.; Ferrari, Fabricio +2 more
We explore the morphometric properties of a group of 73 ram-pressure stripping candidates in the A901/A902 multicluster system, at z~ 0.165, to characterize the morphologies and structural evolution of jellyfish galaxies. By employing a quantitative measurement of morphometric indicators with the algorithm MORFOMETRYKA on Hubble Space Telescope (F…
The ultraviolet luminosity function of star-forming galaxies between redshifts of 0.6 and 1.2
McHardy, I.; Page, M. J.; Symeonidis, M. +11 more
We use ultraviolet (UV) imaging taken with the XMM-Newton Optical Monitor telescope (XMM-OM), covering 280 arcmin2 in the UVW1 band (λeff = 2910 Å) to measure rest-frame UV 1500-Å luminosity functions of galaxies with redshifts z between 0.6 and 1.2. The XMM-OM data are supplemented by a large body of optical and infrared ima…
NGTS 15b, 16b, 17b, and 18b: four hot Jupiters from the Next-Generation Transit Survey
Wheatley, Peter J.; Bayliss, Daniel; Worters, Hannah L. +36 more
We report the discovery of four new hot Jupiters with the Next-Generation Transit Survey (NGTS). NGTS-15b, NGTS-16b, NGTS-17b, and NGTS-18b are short-period (P < 5 d) planets orbiting G-type main-sequence stars, with radii and masses between 1.10 and 1.30RJ and 0.41 and 0.76MJ, respectively. By considering the host star lu…
Magnetic field and activity phenomena of the K2 dwarf V471 Tau
Donati, J. -F.; Klein, B.; Zaire, B.
We analyse spectropolarimetric data of the pre-cataclysmic variable binary system V471 Tau obtained with ESPaDOnS at the Canada-France-Hawaii Telescope in two observational campaigns (in 2004 November/December and 2005 December). Using Zeeman-Doppler imaging, we reconstruct the distribution of brightness map and large-scale magnetic field of the K…
Microlensing predictions: impact of Galactic disc dynamical models
Zang, Weicheng; Mao, Shude; Zhang, Xiangyu +1 more
Galactic model plays an important role in the microlensing field, not only for analyses of individual events but also for statistics of the ensemble of events. However, the Galactic models used in the field vary, and some are unrealistically simplified. Here, we tested three Galactic disc dynamic models; the first is a simple standard model that w…
Mapping the tilt of the Milky Way bulge velocity ellipsoids with ARGOS and Gaia DR2
Lewis, Geraint F.; Bland-Hawthorn, Joss; Koposov, Sergey E. +4 more
Until the recent advent of Gaia Data Release 2 (DR2) and deep multi-object spectroscopy, it has been difficult to obtain 6D phase space information for large numbers of stars beyond 4 kpc, in particular towards the Galactic Centre, where dust and crowding are significant. We combine line-of-sight velocities from the Abundances and Radial velocity …
Observations of compact sources in galaxy clusters using MUSTANG2
Sarazin, Craig L.; Hilton, Matt; Sifón, Cristóbal +26 more
Compact sources can cause scatter in the scaling relationships between the amplitude of the thermal Sunyaev-Zel'dovich Effect (tSZE) in galaxy clusters and cluster mass. Estimates of the importance of this scatter vary - largely due to limited data on sources in clusters at the frequencies at which tSZE cluster surveys operate. In this paper, we p…
New X-ray observations of the hot subdwarf binary HD 49798/RX J0648.0-4418
Rauch, T.; Tiengo, A.; Mereghetti, S. +7 more
HD 49798/RX J0648.0-4418 is the only confirmed X-ray binary in which the mass donor is a hot subdwarf star of O spectral type and, most likely, it contains a massive white dwarf (1.28 ± 0.05 M⊙) with a very fast spin period of 13.2 s. Here, we report the results of new XMM-Newton pointings of this peculiar binary, carried out in 2018 an…
Extreme relativistic reflection in the active galaxy ESO 033-G002
Harrison, F. A.; Stern, D.; Fabian, A. C. +13 more
We present the first high signal-to-noise broad-band X-ray spectrum of the radio-quiet type-2 Seyfert ESO 033-G002, combining data from XMM-Newton and NuSTAR. The nuclear X-ray spectrum is complex, showing evidence for both neutral and ionized absorption, as well as reflection from both the accretion disc and more distant material, but our broad-b…