Search Publications
The Millennium Run Observatory: first light
White, S. D. M.; Bertin, E.; Overzier, R. +5 more
Simulations of galaxy evolution aim to capture our current understanding as well as to make predictions for testing by future experiments. Simulations and observations are often compared in an indirect fashion: physical quantities are estimated from the observational data and compared to models. However, many applications can benefit from a more d…
The dusty aftermath of the V1309 Sco binary merger.
Udalski, A.; Pietrukowicz, P.; Poleski, R. +9 more
We present mid-IR photometry and spectra of the merged binary V1309 Sco taken between 18 and 23 months after outburst. Strong mid-IR emission and a solid-state absorption feature indicate the presence of a significant amount of dust in the circumstellar environment. The absence of detectable mid-IR emission before the outburst suggests that this d…
The SLUGGS Survey: wide field imaging of the globular cluster system of NGC 4278
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +4 more
We use multipointing Hubble Space Telescope Advanced Camera for Surveys and wide field Subaru Suprime-Cam imaging to study the globular cluster system of the L* elliptical galaxy NGC 4278. We have also obtained a handful of new globular cluster spectra with the Keck Deep Imaging Multi-Object Spectrograph. We determine the globular cluster surface …
The Hidden Fortress: structure and substructure of the complex strong lensing cluster SDSS J1029+2623
Schrabback, Tim; Oguri, Masamune; Kochanek, Christopher S. +8 more
We present Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and Wide Field Camera 3 (WFC3) observations of SDSS J1029+2623, a three-image quasar lens system produced by a foreground cluster at z = 0.584. Our strong lensing analysis reveals six additional multiply imaged galaxies in addition to the multiply imaged quasar. We confirm t…
Probing the IGM-galaxy connection at z < 0.5 - II. New insights into the galaxy environments of O VI absorbers in PKS 0405-123
Johnson, Sean D.; Chen, Hsiao-Wen; Mulchaey, John S.
We present new absorption-line analysis and new galaxy survey data obtained for the field around PKS 0405-123 at zQSO = 0.57. Combining previously known O VI absorbers with new identifications in the higher S/N ultraviolet (UV) spectra obtained with the Cosmic Origins Spectrograph, we have established a sample of 7 O VI absorbers and 12…
Isothermal dust models of Herschel-ATLAS galaxies
Clements, D. L.; Cooray, A.; Ibar, E. +18 more
We use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of 250 µm selected galaxies in the local Universe (z < 0.5). As well as simple far-infrared spectral energy dist…
A long XMM-Newton observation of an extreme narrow-line Seyfert 1: PG 1244+026
Done, Chris; Ward, Martin; Jin, Chichuan +1 more
We explore the origin of the strong soft X-ray excess in narrow-line Seyfert 1 galaxies using spectral-timing information from a 120 ks XMM-Newton observation of PG 1244+026. Spectral fitting alone cannot distinguish between a true additional soft X-ray continuum component and strongly relativistically smeared reflection, but both models also requ…
Spatially resolved images of dust belt(s) around the planet-hosting subgiant κ CrB
Crepp, Justin R.; Wyatt, Mark C.; Johnson, John A. +4 more
We present Herschel spatially resolved images of the debris disc orbiting the subgiant κ Coronae Borealis (κ CrB). Not only are these the first resolved images of a debris disc orbiting a subgiant, but κ CrB is a rare example of an intermediate mass star where a detailed study of the structure of the planetary system can be made, including both pl…
The X-ray spectral properties of very-faint persistent neutron star X-ray binaries
Degenaar, N.; Wijnands, R.; Armas Padilla, M.
AX J1754.2-2754, 1RXS J171824.2-402934 and 1RXH J173523.7-354013 are three persistent neutron star low-mass X-ray binaries that display a 2-10 keV accretion luminosity LX of only (1-10) × 1034 erg s-1 (i.e. only ≃0.005-0.05 per cent of the Eddington limit). The phenomenology of accreting neutron stars which accrete…
Supernova 2012ec: identification of the progenitor and early monitoring with PESSTO.
Sollerman, J.; Gal-Yam, A.; Inserra, C. +13 more
We present the identification of the progenitor of the Type IIP SN 2012ec in archival pre-explosion Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys Wide Field Channel F814W images. The properties of the progenitor are further constrained by non-detections in pre-explosion WFPC2 F450W and F606W images. W…