Search Publications
A joint SZ-X-ray-optical analysis of the dynamical state of 288 massive galaxy clusters
Smith, M.; Lidman, C.; Zenteno, A. +77 more
We use imaging from the first three years of the Dark Energy Survey to characterize the dynamical state of 288 galaxy clusters at 0.1 ≲ z ≲ 0.9 detected in the South Pole Telescope (SPT) Sunyaev-Zeldovich (SZ) effect survey (SPT-SZ). We examine spatial offsets between the position of the brightest cluster galaxy (BCG) and the centre of the gas dis…
On the first δ Sct-roAp hybrid pulsator and the stability of p and g modes in chemically peculiar A/F stars
Murphy, Simon J.; Hey, Daniel R.; Saio, Hideyuki +4 more
Strong magnetic fields in chemically peculiar A-type (Ap) stars typically suppress low-overtone pressure modes (p modes) but allow high-overtone p modes to be driven. KIC 11296437 is the first star to show both. We obtained and analysed a Subaru spectrum, from which we show that KIC 11296437 has abundances similar to other magnetic Ap stars, and w…
Detection of Na, K, and H2O in the hazy atmosphere of WASP-6b
Nikolov, Nikolay; Smalley, Barry; Carter, Aarynn L. +13 more
We present new observations of the transmission spectrum of the hot Jupiter WASP-6b both from the ground with the Very Large Telescope FOcal Reducer and Spectrograph (FORS2) from 0.45 to 0.83 µm, and space with the Transiting Exoplanet Survey Satellite from 0.6 to 1.0 µm and the Hubble Space Telescope (HST) Wide Field Camera 3 from 1.1…
On reverberation mapping lag uncertainties
Brandt, W. N.; Kochanek, C. S.; Peterson, B. M. +5 more
We broadly explore the effects of systematic errors on reverberation mapping lag uncertainty estimates from JAVELIN and the interpolated cross-correlation function (ICCF) method. We focus on simulated light curves from random realizations of the light curves of five intensively monitored AGNs. Both methods generally work well even in the presence …
A nearby recent supernova that ejected the runaway star ζ Oph, the pulsar PSR B1706-16, and 60Fe found on Earth
Neuhäuser, R.; Hambaryan, V. V.; Gießler, F.
The detection of ∼1.5-3.2 Myr old 60Fe on Earth indicates recent nearby core-collapse supernovae. For supernovae in multiple stars, the primary stars may become neutron stars, while former companions may become unbound and become runaway stars. We wrote software for tracing back the space motion of runaway and neutron stars to young ass…
White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76-125908.9
Hollands, Mark; Raddi, Roberto; Gänsicke, Boris T. +9 more
WD J204713.76-125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong Balmer absorption lines and atmospheric metal pollution. The exceptional abundances of hydrogen observed in these stars may be the result of accretion of water-rich rocky bodies. We obtained far-ultraviolet and optical…
The hunt for pulsating ultraluminous X-ray sources
Fabian, A. C.; Roberts, T. P.; Lansbury, G. B. +4 more
Motivated by the recent discoveries that six ultraluminous X-ray sources (ULXs) are powered by highly super-Eddington X-ray pulsars, we searched for additional pulsating ULX (PULX) candidates by identifying sources that exhibit long-term flux variability of at least an order of magnitude (a common feature seen in the six known PULXs, which may pot…
Reproducing the Universe: a comparison between the EAGLE simulations and the nearby DustPedia galaxy sample
Mosenkov, Aleksandr V.; Meidt, Sharon E.; De Looze, Ilse +17 more
We compare the spectral energy distributions (SEDs) and inferred physical properties for simulated and observed galaxies at low redshift. We exploit UV-submillimetre mock fluxes of ∼7000 z = 0 galaxies from the EAGLE suite of cosmological simulations, derived using the radiative transfer code skirt. We compare these to ∼800 observed galaxies in th…
Are the spiral arms in the MWC 758 protoplanetary disc driven by a companion inside the cavity?
Pinte, Christophe; Christiaens, Valentin; van der Marel, Nienke +4 more
Spiral arms in protoplanetary discs are thought to be linked to the presence of companions. We test the hypothesis that the double spiral arm morphology observed in the transition disc MWC 758 can be generated by an ≈10MJup companion on an eccentric orbit internal to the spiral arms. Previous studies on MWC 758 have assumed an external …
Chemodynamics of green pea galaxies - I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment
Amorín, R.; Pérez-Montero, E.; Vílchez, J. M. +6 more
We investigate the ionized gas kinematics, physical properties, and chemical abundances of Sloan Digital Sky Survey J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, double-peak Ly α emission and indirect evidence of Lyman continuum (LyC) leakage. Using high-dispersion spectroscopy, we perform a multicomponent analysis of emission-line …