Search Publications
The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE
Mahler, Guillaume; Richard, Johan; Massey, Richard +11 more
We present a multiwavelength analysis of the core of the massive galaxy cluster MACS J0417.5-1154 (z = 0.441). Our analysis takes advantage of Very Large Telescope/Multi-Unit Spectroscopic Explorer observations which allow the spectroscopic confirmation of three strongly lensed systems. System #1, nicknamed The Doughnut, consists of three images o…
On migration of dust and ice grains on the surface of the rotating comet nucleus
Wesołowski, M.; Gronkowski, P.; Tralle, I.
In the paper the migration of dust and ice grains over the surface of the comet nucleus is considered and analysed. This phenomenon is a consequence of interplay between the components of three forces tangential to the surface of comet nucleus and acting on the comet's grain. These forces are the gravity of the comet's nucleus, the frictional forc…
K2 observations of the sdBV + dM/bd binaries PHL 457 and EQ Psc
Reed, M. D.; Jeffery, C. S.; Baran, A. S. +5 more
We present an analysis of two pulsating subdwarf B stars PHL 457 and EQ Psc observed during the K2 mission. The K2 light curves of both stars show variation consistent with irradiation of a cooler companion by the hot subdwarf. They also show higher frequency oscillations consistent with pulsation. Using new spectroscopic data, we measured the rad…
Signs of accretion in the white dwarf + brown dwarf binary NLTT5306
Maxted, P. F. L.; Page, K. L.; Wynn, G. A. +4 more
We present new XSHOOTER spectra of NLTT5306, a 0.44 ± 0.04 M⊙ white dwarf in a short period (101 min) binary system with a brown dwarf companion that is likely to have previously undergone common envelope evolution. We have confirmed the presence of H α emission and discovered Na I absorption associated with the white dwarf. These obser…
The integrated properties of the CALIFA galaxies: model-derived galaxy parameters and quenching of star formation
Zezas, A.; Ciesla, L.; Charmandaris, V. +6 more
We present a study of the integrated properties of the 835 galaxies in the Calar-Alto Legacy Integral Field spectroscopy Area survey. To derive the main physical parameters of the galaxies we have fitted their UV-to-IR spectral energy distributions (SEDs) with sets of theoretical models using CIGALE. We perform a comparison of the integrated galax…
Six new rapidly oscillating Ap stars in the Kepler long-cadence data using super-Nyquist asteroseismology
Huber, Daniel; Bedding, Timothy R.; Howard, Andrew W. +6 more
We perform a search for rapidly oscillating Ap stars in the Kepler long-cadence data, where true oscillations above the Nyquist limit of 283.21 µHz can be reliably distinguished from aliases as a consequence of the barycentric time corrections applied to the Kepler data. We find evidence for rapid oscillations in six stars: KIC 6631188, KIC …
The fifth main-sequence magnetic B-type star showing coherent radio emission: Is this really a rare phenomenon?
Wade, Gregg A.; Chandra, Poonam; Das, Barnali +1 more
We report the discovery of intense, highly directional radio emission from the Bp star HD 35298, which we interpret as the consequence of Electron Cyclotron Maser Emission (ECME). The star was observed with the Giant Metrewave Radio Telescope near the rotational phases of both magnetic nulls in band 4 (550-750 MHz) and one of the nulls in band 5 (…
X-ray time lags in AGN: inverse-Compton scattering and spherical corona model
Chainakun, P.; Young, A. J.; Hancock, S. +1 more
We develop a physically motivated, spherical corona model to investigate the frequency-dependent time lags in active galactic nucleus (AGN). The model includes the effects of Compton up-scattering between the disc ultraviolet (UV) photons and coronal electrons, and the subsequent X-ray reverberation from the disc. The time lags are associated with…
Quasar lenses in the south: searches over the DES public footprint
Agnello, Adriano; Spiniello, Chiara
We have scanned 5000 deg2 of Southern Sky to search for strongly lensed quasars with five methods, all source oriented, but based on different assumptions and selection criteria. We present a list of high-grade candidates from each method (totalling 98 unique, new candidates), to facilitate follow-up spectroscopic campaigns, including t…
The PAU survey: star-galaxy classification with multi narrow-band data
Carretero, J.; Castander, F. J.; García-Bellido, J. +18 more
Classification of stars and galaxies is a well-known astronomical problem that has been treated using different approaches, most of them relying on morphological information. In this paper, we tackle this issue using the low-resolution spectra from narrow-band photometry, provided by the Physics of the Accelerating Universe survey. We find that, w…