Search Publications
Revealing the complex nature of the strong gravitationally lensed system H-ATLAS J090311.6+003906 using ALMA
Ivison, R. J.; Smail, Ian; Cooray, A. +13 more
We have modelled Atacama Large Millimetre/sub-millimetre Array (ALMA) long baseline imaging of the strong gravitational lens system H-ATLAS J090311.6+003906 (SDP.81). We have reconstructed the distribution of band 6 and 7 continuum emission in the z = 3.042 source and determined its kinematic properties by reconstructing CO(5-4) and CO(8-7) line e…
Deep radio imaging of 47 Tuc identifies the peculiar X-ray source X9 as a new black hole candidate
Maccarone, T. J.; Knigge, C.; van den Berg, M. +8 more
We report the detection of steady radio emission from the known X-ray source X9 in the globular cluster 47 Tuc. With a double-peaked C IV emission line in its ultraviolet spectrum providing a clear signature of accretion, this source had been previously classified as a cataclysmic variable. In deep ATCA (Australia Telescope Compact Array) imaging …
HST hot-Jupiter transmission spectral survey: haze in the atmosphere of WASP-6b
Aigrain, S.; Pont, F.; Fortney, J. J. +14 more
We report Hubble Space Telescope optical to near-infrared transmission spectroscopy of the hot-Jupiter WASP-6b, measured with the Space Telescope Imaging Spectrograph and Spitzer's InfraRed Array Camera. The resulting spectrum covers the range 0.29-4.5 µm. We find evidence for modest stellar activity of WASP-6 and take it into account in the…
Composite bulges: the coexistence of classical bulges and discy pseudo-bulges in S0 and spiral galaxies
Beckman, John E.; Bender, Ralf; Thomas, Jens +6 more
We present an analysis of nine S0-Sb galaxies which have (photometric) bulges consisting of two distinct components. The outer component is a flattened, kinematically cool, disc-like structure: a `discy pseudo-bulge'. Embedded inside is a rounder, kinematically hot spheroidal structure: a `classical bulge'. This indicates that pseudo-bulges and cl…
Coevolution of brightest cluster galaxies and intracluster light using CLASH
Hilton, Matt; Burke, Claire; Collins, Chris
We examine the stellar mass assembly in galaxy cluster cores using data from the Cluster Lensing And Supernova survey with Hubble (CLASH). We measure the growth of brightest cluster galaxy (BCG) stellar mass, the fraction of the total cluster light which is in the intracluster light (ICL) and the numbers of mergers that occur in the BCG over the r…
The timing and location of dust formation in the remnant of SN 1987A
Barlow, M. J.; Wesson, R.; Matsuura, M. +1 more
The discovery with the Herschel Space Observatory of bright far-infrared and submm emission from the ejecta of the core-collapse supernova SN 1987A has been interpreted as indicating the presence of some 0.4-0.7 M⊙ of dust. We have constructed radiative transfer models of the ejecta to fit optical to far-infrared observations from the l…
Driving extreme variability: the evolving corona and evidence for jet launching in Markarian 335
Gallo, L. C.; Wilkins, D. R.
Variations in the X-ray emission from the narrow-line Seyfert 1 galaxy, Markarian 335, are studied on both long and short time-scales through observations made between 2006 and 2013 with XMM-Newton, Suzaku and NuSTAR. Changes in the geometry and energetics of the corona that give rise to this variability are inferred through measurements of the re…
Temperature as a third dimension in column-density mapping of dusty astrophysical structures associated with star formation
Marsh, K. A.; Whitworth, A. P.; Lomax, O.
We present point process mapping (<monospace>PPMAP</monospace>), a Bayesian procedure that uses images of dust continuum emission at multiple wavelengths to produce resolution-enhanced image cubes of differential column density as a function of dust temperature and position. <monospace>PPMAP</monospace> is based on the gene…
Accounting for baryonic effects in cosmic shear tomography: determining a minimal set of nuisance parameters using PCA
Gnedin, Nickolay Y.; Eifler, Tim; Hearin, Andrew P. +3 more
Systematic uncertainties that have been subdominant in past large-scale structure (LSS) surveys are likely to exceed statistical uncertainties of current and future LSS data sets, potentially limiting the extraction of cosmological information. Here we present a general framework (Principal Component Analysis - PCA - marginalization) to consistent…
The SINFONI Nearby Elliptical Lens Locator Survey: discovery of two new low-redshift strong lenses and implications for the initial mass function in giant early-type galaxies
Conroy, Charlie; Lucey, John R.; Smith, Russell J.
We present results from a blind survey to identify strong gravitational lenses among the population of low-redshift early-type galaxies. The SINFONI Nearby Elliptical Lens Locator Survey (SNELLS) uses integral-field infrared spectroscopy to search for lensed emission line sources behind massive lens candidates at z < 0.055. From 27 galaxies obs…