Search Publications

A weak lensing mass reconstruction of the large-scale filament feeding the massive galaxy cluster MACS J0717.5+3745

Richard, Johan; Leauthaud, Alexie; Massey, Richard +6 more

We report the first weak lensing detection of a large-scale filament funnelling matter on to the core of the massive galaxy cluster MACS J0717.5+3745.

Our analysis is based on a mosaic of 18 multipassband images obtained with the Advanced Camera for Surveys aboard the Hubble Space Telescope, covering an area of ∼10 × 20 arcmin². We…

Herschel-ATLAS/GAMA: dusty early-type galaxies and passive spirals

Rodighiero, G.; Ivison, R. J.; de Zotti, G. +38 more

We present the dust properties and star formation histories of local submillimetre-selected galaxies, classified by optical morphology. Most of the galaxies are late types and very few are early types. The early-type galaxies (ETGs) that are detected contain as much dust as typical spirals, and form a unique sample that has been blindly selected a…

Probing the haze in the atmosphere of HD 189733b with Hubble Space Telescope/WFC3 transmission spectroscopy

Aigrain, S.; Pont, F.; Gibson, N. P. +6 more

We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting exoplanet HD 189733b, using the Wide Field Camera 3 (WFC3). This consists of time series spectra of two transits, used to measure the wavelength dependence of the planetary radius. These observations aim to test whether the Rayleigh scattering haze detected…

The Herschel Multi-tiered Extragalactic Survey: SPIRE-mm photometric redshifts

Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +78 more

We investigate the potential of submm-mm and submm-mm-radio photometric redshifts using a sample of mm-selected sources as seen at 250, 350 and 500µm by the SPIRE instrument on Herschel. From a sample of 63 previously identified mm sources with reliable radio identifications in the Great Observatories Origins Deep Survey North and Lockman Ho…

The heating of dust by old stellar populations in the bulge of M31

Schinnerer, Eva; Rix, Hans-Walter; Walter, Fabian +9 more

We use new Herschel multiband imaging of the Andromeda galaxy to analyse how dust heating occurs in the central regions of galaxy spheroids that are essentially devoid of young stars. We construct a dust temperature map of M31 through fitting modified blackbodies to the Herschel data, and find that the temperature within 2 kpc rises strongly from …

Hubble Space Telescope Hα imaging of star-forming galaxies at z ≃ 1-1.5: evolution in the size and luminosity of giant H II regions

Rigby, J. R.; Smail, Ian; Jones, T. +10 more

We present Hubble Space Telescope/Wide Field Camera 3 narrow-band imaging of the Hα emission in a sample of eight gravitationally lensed galaxies at z = 1-1.5. The magnification caused by the foreground clusters enables us to obtain a median source plane spatial resolution of 360 pc, as well as providing magnifications in flux ranging from ∼10× to…

SBS 0846+513: a new γ-ray-emitting narrow-line Seyfert 1 galaxy

Giroletti, M.; Stawarz, Ł.; Raiteri, C. M. +11 more

We report Fermi Large Area Telescope (LAT) observations of the radio-loud active galactic nucleus SBS 0846+513 (z = 0.5835), optically classified as a narrow-line Seyfert 1 galaxy, together with new and archival radio-to-X-ray data. The source was not active at γ-ray energies during the first two years of Fermi operation. A significant increase in…

The radial distribution of galaxies in groups and clusters

Belokurov, V.; Koposov, S. E.; McGee, S. L. +2 more

We present a new catalogue of 55 121 groups and clusters centred on luminous red galaxies from Sloan Digital Sky Survey Data Release 7 in the redshift range 0.15 ≤z≤ 0.4. We provide halo mass (M₅₀₀) estimates for each of these groups derived from a calibration between the optical richness of bright galaxies (M_r≤-20.5) within …

Gas-rich mergers and feedback are ubiquitous amongst starbursting radio galaxies, as revealed by the VLA, IRAM PdBI and Herschel

Ivison, R. J.; Smail, Ian; Ibar, E. +14 more

We report new, sensitive observations of two z ∼ 3-3.5 far-infrared-luminous radio galaxies, 6C 1909+72 and B3 J2330+3927, in the ¹²CO J = 1-0 transition with the Karl Jansky Very Large Array and at 100-500 m using Herschel, alongside new and archival ¹²CO J = 4-3 observations from the Plateau de Bure Interferometer. We intro…

Kepler observations of flaring in A-F type stars

Balona, L. A.

Optical flares on early F- and A-type stars have never been observed with certainty. Inspection of several thousands of these stars in the Kepler public archives resulted in the discovery of flares in 25 G-type and 27 F-type stars. Because A-type stars are thought not to be active, the detection of flares on 19 A-type stars from a sample of nearly…