Search Publications
The growth and assembly of a massive galaxy at z ~ 2
Röttgering, H. J. A.; Miley, G. K.; Overzier, R. A. +3 more
We study the stellar mass assembly of the Spiderweb galaxy (MRC1138-262), a massive z = 2.2 radio galaxy in a protocluster and the probable progenitor of a brightest cluster galaxy. Nearby protocluster galaxies are identified and their properties are determined by fitting stellar population models to their rest-frame ultraviolet to optical spectra…
The XMM Cluster Survey: forecasting cosmological and cluster scaling-relation parameter constraints
Hilton, Matt; West, Michael J.; Freeman, Peter E. +16 more
We forecast the constraints on the values of σ8,Ωm and cluster scaling-relation parameters which we expect to obtain from the XMM Cluster Survey (XCS). We assume a flat Λ cold dark matter Universe and perform a Monte Carlo Markov Chain analysis of the evolution of the number density of galaxy clusters that takes into account …
Giant cavities, cooling and metallicity substructure in Abell 2204
Fabian, A. C.; Sanders, J. S.; Taylor, G. B.
We present results from deep Chandra and XMM-Newton observations of the relaxed X-ray luminous galaxy cluster Abell 2204. We detect metallicity inhomogeneities in the intracluster medium on a variety of distance scales, from a ~12 kpc enhancement containing a few times 107 Msolar of iron in the centre to a region at 400 kpc r…
An HST/ACS investigation of the spatial and chemical structure and sub-structure of NGC 891, a Milky Way analogue
Ibata, Rodrigo; Mouhcine, Mustapha; Rejkuba, Marina
We present a structural analysis of NGC 891, an edge-on galaxy that has long been considered to be an analogue of the Milky Way. Using star-counts derived from deep Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) images, we detect the presence of a thick disc component in this galaxy with vertical scaleheight hZ = 1.44 +/- …
M31* and its circumnuclear environment
Wakker, Bart P.; Wang, Q. Daniel; Li, Zhiyuan
We present a multiwavelength investigation of the circumnuclear environment of the Andromeda galaxy (M31), utilizing archival Chandra, FUSE, GALEX, HST and Spitzer data as well as ground-based observations. Based on the Chandra/ACIS data, we tightly constrain the X-ray luminosity of M31*, the central supermassive black hole (SMBH) of the galaxy, t…
Hubble Space Telescope survey of the Perseus Cluster - I. The structure and dark matter content of cluster dwarf spheroidals
Conselice, Christopher J.; Penny, Samantha J.; de Rijcke, Sven +1 more
We present the results of a Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) study of dwarf galaxies in the core of the rich nearby Perseus Cluster, down to MV = -12. We identify 29 dwarfs as cluster members, 17 of which are previously unstudied. All the dwarfs we examine are remarkably smooth in appearance, and lack inter…
Feedback through multiple outbursts in the cluster 2A 0335+096
Fabian, A. C.; Sanders, J. S.; Taylor, G. B.
We examine the core of the X-ray bright galaxy cluster 2A 0335+096 using deep Chandra X-ray imaging and spatially resolved spectroscopy, and include new radio observations. The set of around eight X-ray bright blobs in the core of the cluster, appearing like eggs in a bird's nest, contains multiphase gas from ~0.5 to 2 keV. The morphology of the c…
The nucleus of NGC 253 and its massive stellar clusters at parsec scales
Prieto, M. A.; Acosta-Pulido, J. A.; Fernández-Ontiveros, J. A.
Very Large Telescope adaptive optics images of NGC 253 with resolutions down to 200mas resolve the central 300pc of this galaxy in ~37 infrared (IR) bright knots, a factor of 3 larger than previously reported and extended diffuse emission. The angular resolution, comparable to that of available Very Large Array 2cm maps, permits us a very accurate…
A spectacular giant arc in the massive cluster lens MACSJ1206.2-0847
Kneib, J. -P.; Jullo, E.; Edge, A. C. +5 more
We discuss the X-ray and optical properties of the massive galaxy cluster MACSJ1206.2-0847 (z = 0.4385), discovered in the Massive Cluster Survey (MACS). Our Chandra observation of the system yields a total X-ray luminosity of 2.4 × 1045ergs-1 (0.1-2.4 keV) and a global gas temperature of 11.6 +/- 0.7keV, very high values typ…
An ultra-compact dwarf around the Sombrero galaxy (M104): the nearest massive UCD
Spitler, Lee R.; Forbes, Duncan A.; Brodie, Jean P. +5 more
We report the discovery of an ultra-compact dwarf (UCD) associated with the Sombrero galaxy (M104). This is the closest massive UCD known and the first spectroscopically verified massive UCD which is located in a low-density environment.
The object, we name SUCD1, was identified in Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS…