Search Publications
The magnetic field and wind confinement of β Cephei: new clues for interpreting the Be phenomenon?
Donati, J. -F.; Babel, J.; Harries, T. J. +3 more
In this paper, we use the very recent spectropolarimetric observations of β Cep collected by Henrichs et al. and propose for this star a consistent model of the large-scale magnetic field and of the associated magnetically confined wind and circumstellar environment. A re-examination of the fundamental parameters of β Cep in the light of the Hippa…
Bipolar outflows in OH/IR stars
Norris, R. P.; Molster, F. J.; Comeron, F. +5 more
We investigate the development of bipolar outflows during the early post-AGB evolution. A sample of 10 OH/IR stars with irregular OH spectra and unusually large expansion velocities is observed at high angular resolution. The sample includes bipolar nebulae (e.g., OH231.8+4.2), bright post-AGB stars (HD 101584) and reflection nebulae (e.g., Robert…
Evidence for evolving spheroidals in the Hubble Deep Fields North and South
Menanteau, F.; Abraham, R. G.; Ellis, R. S.
We investigate the dispersion in the internal colours of faint spheroidals in the Hubble Deep Fields North and South. In high-redshift rapid-collapse scenarios, the dispersion in internal colours should be small at moderate redshift apart from a small metallicity induced reddening in the enriched cores. However, recently assembled spheroidals are …
Chandra observations of the X-ray jet in 3C 66B
Hardcastle, M. J.; Birkinshaw, M.; Worrall, D. M.
Our Chandra observation of the FR I radio galaxy 3C 66B has resulted in the first detection of an X-ray counterpart to the previously known radio, infrared and optical jet. The X-ray jet is detected up to 7arcsec from the core and has a steep X-ray spectrum, α~1.3+/-0.1. The overall X-ray flux density and spectrum of the jet are consistent with a …
A NICMOS imaging study of high-z quasar host galaxies
Baum, Stefi A.; O'Dea, Christopher P.; Dunlop, James S. +4 more
We present the first results from a major Hubble Space Telescope programme designed to investigate the cosmological evolution of quasar host galaxies from µ z≃ 2r to the present day. Here we describe J and H-band NICMOS imaging of two quasar samples at redshifts of 0.9 and 1.9 respectively. Each sample contains equal numbers of radio-loud an…
HST/WFPC2 imaging of the QDOT ultraluminous infrared galaxy sample
Farrah, D.; Colina, L.; Serjeant, S. +6 more
We present HST WFPC2 V-band imaging for 23 ultraluminous infrared galaxies (ULIRGs) taken from the QDOT redshift survey. The fraction of sources observed to be interacting is 87 per cent. Most of the merging systems show a number of compact `knots', whose colour and brightness differ substantially from their immediate surroundings. Colour maps for…
The properties of field elliptical galaxies at intermediate redshift - II. Photometry and spectroscopy of an HST-selected sample
Treu, T.; Stiavelli, M.; Møller, P. +2 more
A sample of field early-type galaxies (E/S0) at intermediate redshift (z~0.1-0.6) is selected, based on morphology and colours from HST-WFPC2 parallel images. Photometric structural parameters (effective radius Re and effective surface brightness SBe) are derived through the F606W and F814W filters, using luminosity profile f…
ISO LWS observations of planetary nebula fine-structure lines
Barlow, M. J.; Cohen, M.; Liu, X. -W. +7 more
We have obtained 43-198µm far-infrared (IR) spectra for a sample of 51 Galactic planetary nebulae (PN) and protoplanetary nebulae (PPN), using the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). Spectra were also obtained of the former PN candidate Lo 14. The spectra yield fluxes for the fine-structure lines…
High-frequency oscillations in a solar active region coronal loop
Mathioudakis, M.; Keenan, F. P.; Phillips, K. J. H. +6 more
The Solar Eclipse Corona Imaging System (SECIS) was used to record high-cadence observations of the solar corona during the total solar eclipse of 1999 August 11. During the 2min 23.5s of totality, 6364 images were recorded simultaneously in each of the two channels: a white light channel, and the Fexiv (5303Å) `green line' channel (T~2MK). Here w…
The properties of field elliptical galaxies at intermediate redshift - III. The Fundamental Plane and the evolution of stellar populations from z~0.4 to z=0
Treu, T.; Stiavelli, M.; Møller, P. +2 more
We report on the study of a sample of 25 field early-type galaxies, in the redshift range z~0.1-0.5, selected on the basis of colours and morphology from the Medium Deep Survey (MDS) of the Hubble Space Telescope (HST). Surface photometry in two colours (F606W and F814W) and redshifts have been derived for all the galaxies in the sample, while vel…