Search Publications
A comprehensive near- and far-ultraviolet spectroscopic study of the hot DA white dwarf G191-B2B
Barstow, M. A.; Holberg, J. B.; Preval, S. P. +1 more
We present a detailed spectroscopic analysis of the hot DA white dwarf G191-B2B, using the best signal-to-noise ratio, high-resolution near- and far-UV spectrum obtained to date. This is constructed from co-added Hubble Space Telescope (HST) Space Telescope Imaging Spectrometer (STIS) E140H, E230H and FUSE observations, covering the spectral range…
Flexion measurement in simulations of Hubble Space Telescope data
Massey, Richard; Rhodes, Jason; Heymans, Catherine +5 more
We present a simulation analysis of weak gravitational lensing flexion and shear measurement using shapelet decomposition, and identify differences between flexion and shear measurement noise in deep survey data. Taking models of galaxies from the Hubble Space Telescope Ultra Deep Field (HUDF) and applying a correction for the HUDF point spread fu…
VLT/XSHOOTER and Subaru/MOIRCS spectroscopy of HUDF.YD3: no evidence for Lyman α emission at z = 8.55
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +5 more
We present spectroscopic observations with VLT/XSHOOTER and Subaru/MOIRCS of a relatively bright Y-band drop-out galaxy in the Hubble Ultra Deep Field (HUDF), first selected by Bunker et al., McLure et al. and Bouwens et al. to be a likely z ≈ 8-9 galaxy on the basis of its colours in the Hubble Space Telescope (HST) Advanced Camera for Surveys an…
The Herschel-PEP survey: evidence for downsizing in the hosts of dusty star-forming systems
Berta, S.; Magnelli, B.; Nordon, R. +27 more
By making use of Herschel PACS Evolutionary Probe observations of the COSMOS and Extended Groth Strip fields, we have estimated the dependence of the clustering properties of FIR-selected sources on their 100 µm fluxes. Our analysis shows a tendency for the clustering strength to decrease with limiting fluxes. By assuming a power-law slope w…
The X-ray/UV absorber in NGC 4593
Kaastra, J. S.; Kriss, G. A.; Costantini, E. +2 more
We present the results of a recent (2011 March) 160 ks Chandra-LETGS (Low Energy Transmission Grating Spectrometre) observation of the Seyfert galaxy NGC 4593, and the analysis of archival X-ray and UV spectra taken with XMM-Newton and Hubble Space Telescope (HST)/STIS (Space Telescope Imaging Spectrograph) in 2002. We find evidence of a multi-com…
Mining the Herschel-Astrophysical Terahertz Large Area Survey: submillimetre-selected blazars in equatorial fields
Ivison, R. J.; Sutherland, W.; Bonavera, L. +29 more
The Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) provides an unprecedented opportunity to search for blazars at sub-mm wavelengths. We cross-matched the Faint Images of the Radio Sky at Twenty-cm (FIRST) radio source catalogue with the 11 655 sources brighter than 35 mJy at 500 µm in the ∼135 deg2 of the sky covere…
Extended and filamentary Lyα emission from the formation of a protogalactic halo at z = 2.63
Rauch, Michael; Haehnelt, Martin G.; Sargent, Wallace L. W. +2 more
We report the observation of a further asymmetric, extended Lyα emitting halo at z = 2.63, from our ultra-deep, long-slit spectroscopic survey of faint high-redshift emitters, undertaken with Magellan LDSS3 in the GOODS-S field. The Lyα emission, detected over more than 30 kpc, is spatially coincident with a statistically significant concentration…
Decoupling absorption and continuum variability in the Seyfert 2 NGC 4507
Ptak, A.; Turner, T. J.; Ballo, L. +3 more
We present the results of the Suzaku observation of the Seyfert 2 galaxy NGC 4507. This source is one of the X-ray brightest Compton-thin Seyfert 2s and a candidate for a variable absorber. Suzaku caught NGC 4507 in a highly absorbed state characterized by a high column density (NH ∼ 8 × 1023 cm-2), a strong reflec…
Discovering a 5.72-d period in the supergiant fast X-ray transient AX J1845.0-0433
Hill, A. B.; Sidoli, L.; Bird, A. J. +5 more
Temporal analysis of INTEGRAL/IBIS data has revealed a 5.7195 ± 0.0007 d periodicity in the supergiant fast X-ray transient source AX J1845.0-0433, which we interpret as the orbital period of the system. The new-found knowledge of the orbital period is utilized to investigate the geometry of the system by means of estimating an upper limit for the…
A new population of planetary nebulae discovered in the Large Magellanic Cloud (IV): the outer LMC
Parker, Quentin A.; Reid, Warren A.
We have extended our planetary nebulae (PNe) survey to the outer ∼64 deg2 of the Large Magellanic Cloud (LMC) using maps from the Magellanic Cloud Emission Line Survey (MCELS) and the UK Schmidt Telescope (UKST) Hα survey. Although the MCELS survey has poorer ∼5 arcsec resolution than both the UKST Hα survey and the original Hα median s…