Search Publications
Near-infrared properties of i-drop galaxies in the Hubble Ultra Deep Field
Bunker, Andrew J.; McMahon, Richard G.; Stanway, Elizabeth R.
We analyse near-infrared Hubble Space Telescope (HST)/Near-Infrared Camera and Multi-Object Spectrometer F110W (J) and F160W (H) band photometry of a sample of 27 i'-drop candidate z~= 6 galaxies in the central region of the HST/Advanced Camera for Surveys Ultra Deep Field. The infrared colours of the 20 objects not affected by near neighbours are…
A study of the Type II-P supernova 2003gd in M74
Smartt, S. J.; Peletier, R. F.; Kotak, R. +18 more
We present photometric and spectroscopic data of the Type II-P supernova (SN II-P) 2003gd, which was discovered in M74 close to the end of its plateau phase. SN 2003gd is the first Type II supernova (SN) to have a directly confirmed red supergiant (RSG) progenitor. We compare SN 2003gd to SN 1999em, a similar SN II-P, and estimate an explosion dat…
High-resolution studies of radio sources in the Hubble Deep and Flanking Fields
Muxlow, T. W. B.; Richards, A. M. S.; Wilkinson, P. N. +8 more
18 days of MERLIN data and 42 h of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep Field (HDF). This area also includes the Hubble Flanking Fields (HFF). A complete sample of 92 radio sources with S1.4 > 40 µJy was detected using the VLA data alone and then imaged with the ME…
The abundance discrepancy - recombination line versus forbidden line abundances for a northern sample of galactic planetary nebulae
Barlow, M. J.; Liu, X. -W.; Wesson, R.
We present deep optical spectra of 23 galactic planetary nebulae, which are analysed in conjunction with archival infrared and ultraviolet spectra. We derive nebular electron temperatures based on standard collisionally excited line (CEL) diagnostics as well as the hydrogen Balmer jump and find that, as expected, the Balmer jump almost always yiel…
Evolution of X-ray emission from young massive star clusters
Oskinova, L. M.
The evolution of X-ray emission from young massive star clusters is modelled, taking into account the emission from the stars as well as from the cluster wind. It is shown that the level and character of the soft (0.2-10 keV) X-ray emission change drastically with cluster age and are tightly linked with stellar evolution. Using the modern X-ray ob…
The evolution of the galaxy B-band rest-frame morphology to z~ 2: new clues from the K20/GOODS sample
Cimatti, A.; Daddi, E.; Rodighiero, G. +7 more
We present a detailed analysis of the evolution of the rest-frame B-band morphology of K-selected galaxies with 0 < z < 2.5. This work is based on the K20 spectroscopic sample (Ks < 20) located within the Chandra Deep Field South area, coupled with the public deep GOODS (Great Observatories Origins Deep Surveys) Hubble Space Telescope (HS…
Dynamical modelling of stars and gas in NGC 2974: determination of mass-to-light ratio, inclination and orbital structure using the Schwarzschild method
Krajnović, Davor; Emsellem, Eric; Cappellari, Michele +2 more
We study the large-scale stellar and gaseous kinematics of the E4 galaxy NGC 2974, based on panoramic integral-field data obtained with SAURON. We quantify the velocity maps with Fourier methods (kinemetry), and show that the large-scale kinematics is largely consistent with axisymmetry. We construct general axisymmetric dynamical models for the s…
Cosmological weak lensing with the HST GEMS survey
Bell, Eric F.; Wisotzki, Lutz; Wolf, Christian +16 more
We present our cosmic shear analysis of GEMS, one of the largest wide-field surveys ever undertaken by the Hubble Space Telescope. Imaged with the Advanced Camera for Surveys (ACS), GEMS spans 795 arcmin2 in the Chandra Deep Field South. We detect weak lensing by large-scale structure in high-resolution F606W GEMS data from ~60 resolved…
New constraints on modified Newtonian dynamics from galaxy clusters
Silk, Joseph; Pointecouteau, Etienne
We revisit the application of modified Newtonian dynamics (MOND) to galaxy clusters. We confront the high-quality X-ray data for eight clusters of galaxies observed by the XMM-Newton satellite with the predictions of MOND. We obtain a ratio of the MOND dynamical mass to the baryonic mass of Mm/Mb= 4.94 +/- 0.50 in the outer p…
Physics of accretion in the millisecond pulsar XTE J1751-305
Gierliński, Marek; Poutanen, Juri
We have undertaken an extensive study of X-ray data from the accreting millisecond pulsar XTE J1751-305 observed by RXTE and XMM-Newton during its 2002 outburst. In all aspects this source is similar to the prototypical millisecond pulsar SAX J1808.4-3658, except for the higher peak luminosity of 13 per cent of Eddington, and the optical depth of …