Search Publications
The UV/optical spectra of the Type Ia supernova SN 2010jn: a bright supernova with outer layers rich in iron-group elements
Gal-Yam, A.; Kulkarni, S. R.; Sullivan, M. +19 more
Radiative transfer studies of Type Ia supernovae (SNe Ia) hold the promise of constraining both the density profile of the SN ejecta and its stratification by element abundance which, in turn, may discriminate between different explosion mechanisms and progenitor classes. Here we analyse the Type Ia SN 2010jn (PTF10ygu) in detail, presenting and e…
The unbiased measurement of ultraviolet spectral slopes in low-luminosity galaxies at z ≈ 7
McLure, R. J.; Dunlop, J. S.; Rogers, A. B.
The ultraviolet (UV) continuum slope β, typically observed at z ≈ 7 in Hubble Space Telescope (HST) WFC3/IR bands via the J - H colour, is a useful indicator of the age, metallicity and dust content of high-redshift stellar populations. Recent studies have shown that the redward evolution of β with cosmic time from redshift 7 to 4 can be largely e…
Deep luminosity functions and colour-magnitude relations for cluster galaxies at 0.2 < z < 0.6
Bremer, M. N.; De Propris, R.; Phillipps, S.
We derive deep I-band luminosity functions and colour-magnitude diagrams from Hubble Space Telescope imaging for eleven 0.2 < z < 0.6 clusters observed at various stages of merging, and a comparison sample of five more relaxed clusters at similar redshifts. The characteristic magnitude M* evolves passively out to z = 0.6, while the faint-end…
The size of the X-ray emitting region in SWIFT J2127.4+5654 via a broad line region cloud X-ray eclipse
Fabian, A. C.; Miller, J. M.; Miniutti, G. +4 more
We present results obtained from the time-resolved X-ray spectral analysis of the Narrow-Line-Seyfert 1 galaxy SWIFT J2127.4+5654 during a ∼130 ks XMM-Newton observation. We reveal large spectral variations, especially during the first ∼90 ks of the XMM-Newton exposure. The spectral variability can be attributed to a partial eclipse of the X-ray s…
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…