Search Publications
Multiwavelength cosmological simulations of elliptical galaxies
Kawata, D.; Gibson, B. K.
We study the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using high-resolution cosmological simulations. Our tree N-body/smoothed particle hydrodynamics (SPH) code includes a self-consistent treatment of radiative cooling, star formation, supernovae feedback and chemical enrichment. We present a series of…
The Fundamental Plane and the evolution of the M/L ratio of early-type field galaxies up to z~ 1
Franx, M.; van Dokkum, P. G.; van de Ven, G.
We analyse the Fundamental Plane (FP) of 26 strong gravitational lens galaxies with redshifts up to z~ 1, using tabulated data from Kochanek et al. and Rusin et al. The lens galaxies effectively form a mass-selected sample of early-type galaxies in environments of relatively low density. We analyse the FP and its evolution in the rest-frame Johnso…
Extreme galactic wind and Wolf-Rayet features in infrared mergers and infrared quasi-stellar objects
Taniguchi, Y.; Zheng, W.; Terlevich, R. +5 more
We report, as a part of a long-term study of infrared (IR) mergers and IR quasi-stellar objects (QSOs), detailed spectroscopic evidence for outflow (OF) and Wolf-Rayet (WR) features in the nearby mergers NGC4038/39 and IRAS 23128-5919 (with low-velocity OF); and the nearby QSOs IRAS 01003-2238 and 13218+0552 (with extreme velocity OF, EVOF). We al…
Near-infrared spectroscopy of (proto)-planetary nebulae: molecular hydrogen excitation as an evolutionary tracer
Smith, Michael D.; Davis, Christopher J.; Stern, Luke +2 more
We present an in-depth analysis of molecular excitation in 11 H2-bright planetary and protoplanetary nebulae (PN and PPN). From newly acquired K-band observations, we extract a number of spectra at positions across each source. H2 line intensities are plotted on `column density ratio' diagrams so that we may examine the excit…
RR Lyrae stars in four globular clusters in the Fornax dwarf galaxy
Mackey, A. D.; Gilmore, G. F.
We have surveyed four of the globular clusters in the Fornax dwarf galaxy (clusters 1, 2, 3 and 5) for RR Lyrae stars, using archival F555W and F814W Hubble Space Telescope observations. We identify 197 new RR Lyrae stars in these four clusters, and 13 additional candidate horizontal-branch variable stars. Although somewhat restricted by our short…
Hubble Space Telescope observations of globular cluster systems along the Hubble sequence of spiral galaxies
Strader, Jay; Minniti, Dante; Kissler-Patig, Markus +3 more
We have studied the globular cluster systems of seven giant, edge-on spiral galaxies using Hubble Space Telescope imaging in V and I. The galaxy sample covers the Hubble types Sa to Sc, allowing us to study the variation of the properties of globular cluster systems along the Hubble sequence. The photometry reaches ~1.5 mag beyond the turn-over ma…
Mass limits for the progenitor star of supernova 2001du and other Type II-P supernovae
Smartt, S. J.; Benetti, S.; Maund, J. R. +3 more
The supernova SN 2001du was discovered in the galaxy NGC 1365 at a distance of 19+/-2Mpc, and is a core-collapse event of Type II-P. Images of this galaxy, of moderate depth, have been taken with the Hubble Space Telescope approximately 6.6 yr before discovery and include the supernova position on the WFPC2 field of view. We have observed the supe…
XMM-Newton and the Pleiades - I. Bright coronal sources and the X-ray emission from intermediate-type stars
Briggs, K. R.; Pye, J. P.
We present results of X-ray spectral and timing analyses of solar-like (spectral types F5-K8) and intermediate-type (B4-F4) Pleiads observed in a 40-ks XMM-Newton EPIC exposure, probing X-ray luminosities (LX) up to a factor 10 fainter than previous studies using the ROSAT PSPC. All eight solar-like members have `quasi-steady'LX
Hubble Space Telescope imaging and ground-based spectroscopy of old nova shells - II. The bipolar shell of the slow nova HR Del
O'Brien, T. J.; Harman, D. J.
We present Hubble Space Telescope (HST) WFPC2 imaging of HR Del in filters centred on the lines of Hα, [N II] and [O III], with corresponding William Herschel Telescope (WHT) ISIS slit spectroscopy for the lines of Hα, Hβ, [N II] and [O III]. The data show that the ejected shell of HR Del is composed of many small bright knots. These are distribut…
Photometric redshifts in the Hubble Deep Fields: evolution of extinction and the star formation rate
Rowan-Robinson, Michael
Photometric redshifts are studied with a template approach using data from the Hubble Deep Field (HDF) North and South. The problem of aliasing in photometric redshift estimates is investigated in some detail and found not to be a significant problem if at least four photometric bands are available. The performance of the approach presented here a…