Search Publications
Kinematically quiet haloes around z~ 2.5 radio galaxies. Keck spectroscopy
Pentericci, L.; Humphrey, A.; Villar-Martín, M. +3 more
We present the results of the kinematic study of the extended gas in a sample of 10 high-redshift radio galaxies (z~ 2.5) based on high signal-to-noise ratio Keck II and Very Large Telescope (VLT) long-slit spectroscopy. In addition to the typical high surface brightness kinematically perturbed regions (FWHM and velocity shifts >1000 km s-…
The remarkable rapid X-ray, ultraviolet, optical and infrared variability in the black hole XTE J1118+480
Chaty, S.; Cui, W.; Horne, Keith +6 more
The transient black-hole binary XTE J1118+480 exhibited dramatic rapid variability at all wavelengths which were suitably observed during its 2000 April-July outburst. We examine time-resolved X-ray, ultraviolet, optical and infrared data spanning the plateau phase of the outburst. We find that both X-ray and infrared bands show large amplitude va…
A deep survey of heavy element lines in planetary nebulae - I. Observations and forbidden-line densities, temperatures and abundances
Tsamis, Y. G.; Barlow, M. J.; Liu, X. -W. +2 more
We present deep optical spectrophotometry of 12 Galactic planetary nebulae (PNe) and three Magellanic Cloud PNe. Nine of the Galactic PNe were observed by scanning the slit of the spectrograph across the nebula, yielding relative line intensities for the entire nebula that are suitable for comparison with integrated nebular fluxes measured in othe…
Infrared stellar populations in the central parts of the Milky Way galaxy
Blommaert, J. A. D. L.; Glass, I. S.; Omont, A. +7 more
Near- and mid-IR survey data from DENIS and ISOGAL are used to investigate the structure and formation history of the inner 10° (1.4 kpc) of the Milky Way galaxy. Synthetic bolometric corrections and extinction coefficients in the near- and mid-infrared (mid-IR) are derived for stars of different spectral types, to allow the transformation of theo…
The Hubble diagram of type Ia supernovae as a function of host galaxy morphology
Panagia, N.; Wang, L.; Sullivan, M. +41 more
We present new results on the Hubble diagram of distant type Ia supernovae (SNeIa) segregated according to the type of host galaxy. This makes it possible to check earlier evidence for a cosmological constant by explicitly comparing SNe residing in galaxies likely to contain negligible dust with the larger sample. The cosmological parameters deriv…
Spectroscopy of the near-nuclear regions of Cygnus A: estimating the mass of the supermassive black hole
Marconi, A.; Axon, D.; Jackson, N. +3 more
We use a combination of high spatial resolution optical and near-infrared spectroscopic data to make a detailed study of the kinematics of the narrow-line region (NLR) gas in the near-nuclear regions of the powerful, FRII radio galaxy Cygnus A (z= 0.0560), with the overall goal of placing limits on the mass of any supermassive black hole in the co…
Surface brightness profiles and structural parameters for 10 rich stellar clusters in the Small Magellanic Cloud
Mackey, A. D.; Gilmore, G. F.
As a follow-up to our recent study of a large sample of Large Magellanic Cloud (LMC) clusters, we have conducted a similar study of the structures of 10 Small Magellanic Cloud (SMC) clusters, using archival Hubble Space Telescope snapshot data. We present surface brightness profiles for each cluster and derive structural parameters, including core…
Multiwavelength observations revealing the evolution of the outburst of the black hole XTE J1118+480
Chaty, S.; Cui, W.; Shrader, C. R. +3 more
We report multiwavelength observations of the soft X-ray transient XTE J1118+480, which we observed with UKIRT, Hubble Space Telescope (HST), RXTE, Extreme Ultraviolet Explorer (EUVE) and many other instruments and facilities. Adding radio (Ryle Telescope, VLA), submillimetre (JCMT) and X-ray (Chandra and SAX) data from the literature, we assemble…
Surface brightness profiles and structural parameters for globular clusters in the Fornax and Sagittarius dwarf spheroidal galaxies
Mackey, A. D.; Gilmore, G. F.
We present radial surface brightness profiles for all five globular clusters in the Fornax dwarf spheroidal galaxy, and for the four present members of the Sagittarius dwarf spheroidal galaxy. These profiles are derived from archival Hubble Space Telescope observations, and have been calculated using the same techniques with which we measured prof…
A star-forming galaxy at z= 5.78 in the Chandra Deep Field South
Bunker, Andrew J.; McMahon, Richard G.; McCarthy, Patrick J. +2 more
We report the discovery of a luminous z= 5.78 star-forming galaxy in the Chandra Deep Field South. This galaxy was selected as an `i-drop' from the GOODS public survey imaging with the Hubble Space Telescope/Advanced Camera for Surveys (object 3 in the work of Stanway, Bunker & McMahon 2003). The large colour of (i'-z')AB= 1.6 indic…