Search Publications
The death of massive stars - I. Observational constraints on the progenitors of Type II-P supernovae
Smartt, S. J.; Maund, J. R.; Eldridge, J. J. +1 more
We present the results of a 10.5-yr, volume-limited (28-Mpc) search for supernova (SN) progenitor stars. In doing so we compile all SNe discovered within this volume (132, of which 27 per cent are Type Ia) and determine the relative rates of each subtype from literature studies. The core-collapse SNe break down into 59 per cent II-P and 29 per cen…
Galaxy Zoo Green Peas: discovery of a class of compact extremely star-forming galaxies
Schawinski, Kevin; Keel, William C.; Sarzi, Marc +14 more
We investigate a class of rapidly growing emission line galaxies, known as `Green Peas', first noted by volunteers in the Galaxy Zoo project because of their peculiar bright green colour and small size, unresolved in Sloan Digital Sky Survey imaging. Their appearance is due to very strong optical emission lines, namely [OIII] λ5007Å, with an unusu…
The ultraluminous state
Done, Chris; Roberts, Timothy P.; Gladstone, Jeanette C.
We revisit the question of the nature of ultraluminous X-ray sources (ULXs) through a detailed investigation of their spectral shape, using the highest quality X-ray data available in the XMM-Newton public archives (>~10000 counts in their EPIC spectrum). We confirm that simple spectral models commonly used for the analysis and interpretation o…
Simultaneous X-ray/optical/UV snapshots of active galactic nuclei from XMM-Newton: spectral energy distributions for the reverberation mapped sample
Fabian, A. C.; Vasudevan, R. V.
We employ contemporaneous optical, ultraviolet (UV) and X-ray observations from the XMM-Newton European Photon Imaging Camera (EPIC-pn) and Optical Monitor (OM) archives to present, for the first time, simultaneous spectral energy distributions (SEDs) for the majority of the Peterson et al. reverberation mapped sample of active galactic nuclei (AG…
Kinematics and history of the solar neighbourhood revisited
Binney, James J.; Aumer, Michael
We use proper motions and parallaxes from the new reduction of Hipparcos data and Geneva-Copenhagen radial velocities for a complete sample of ~15000 main-sequence and subgiant stars, and new Padova isochrones to constrain the kinematics and star formation history of the solar neighbourhood. We rederive the solar motion and the structure of the lo…
Quantifying the coexistence of massive black holes and dense nuclear star clusters
Spitler, Lee R.; Graham, Alister W.
In large spheroidal stellar systems, such as elliptical galaxies, one invariably finds a 106-109Msolar supermassive black hole at their centre. In contrast, within dwarf elliptical galaxies one predominantly observes a 105-107Msolar nuclear star cluster. To date, few galaxies have b…
Kinematic properties of early-type galaxy haloes using planetary nebulae*
Freeman, K. C.; Capaccioli, M.; Napolitano, N. R. +11 more
We present new planetary nebulae (PNe) positions, radial velocities and magnitudes for six early-type galaxies obtained with the Planetary Nebulae Spectrograph (PNS), along with derived two-dimensional velocity and velocity dispersion fields, and the α parameters (i.e. the number of PNe per unit luminosity). We also present new deep absorption-lin…
The STAGES view of red spirals and dusty red galaxies: mass-dependent quenching of star formation in cluster infall
Papovich, Casey; Bell, Eric F.; Gallazzi, Anna +22 more
We investigate the properties of optically passive spirals and dusty red galaxies in the A901/2 cluster complex at redshift ~0.17 using rest-frame near-ultraviolet-optical spectral energy distributions, 24-µm infrared data and Hubble Space Telescope morphologies from the STAGES data set. The cluster sample is based on COMBO-17 redshifts with…
New multiply-lensed galaxies identified in ACS/NIC3 observations of Cl0024+1654 using an improved mass model
Broadhurst, Tom; Zheng, Wei; Zitrin, Adi +9 more
We present an improved strong-lensing analysis of Cl0024+1654 (z = 0.39) using deep Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS)/NIC3 images, based on 33 multiply-lensed images of 11 background galaxies. These are found with a model that assumes mass approximately traces light, with a low-order expansion to allow for flexibility …
The active nuclei of z < 1.0 3CRR radio sources
Hardcastle, M. J.; Croston, J. H.; Evans, D. A.
We combine Chandra and XMM-Newton X-ray data from our previous papers with new X-ray observations and with Spitzer mid-infrared (mid-IR) data in order to study the nature of the nuclei of radio galaxies and radio-loud quasars with z < 1.0 from the 3CRR sample. The significant increase in sample size over our previous work, the reduction of bias…