Search Publications
A Deep Radio Survey of Abell 2125. II. Accelerated Galaxy Evolution during a Cluster-Cluster Merger
Morrison, G. E.; Wang, Q. D.; Owen, Frazer N. +2 more
Using our extensive radio, optical, near-IR, and X-ray imaging and spectroscopy, we consider the reason for the unusually large number of radio-detected galaxies, mostly found outside the cluster core, in Abell 2125 (z=0.2465, richness class 4). With 20 cm VLA data, we detect continuum emission from 90 cluster members. The multiwavelength properti…
Wave particle interactions in the high-altitude polar cusp: a Cluster case study
Balogh, A.; Lavraud, B.; André, M. +5 more
On 23 March 2002, the four Cluster spacecraft crossed in close configuration (~100 km separation) the high-altitude (10 RE) cusp region. During a large part of the crossing, the STAFF and EFW instruments have detected strong electromagnetic wave activity at low frequencies, especially when intense field-aligned proton fluxes were detect…
The element abundance FIP effect in the quiet Sun
Young, P. R.
The Mg/Ne abundance ratio in the quiet Sun is measured in both network and supergranule cell centre regions through EUV spectra from the Coronal Diagnostic Spectrometer on SOHO. Twenty four sets of data over the period 1996 March to 1998 June (corresponding to solar minimum and the onset of the next cycle) are studied. Emission lines of the sequen…
Titan atmosphere database
Lebonnois, S.; Rannou, P.; Luz, D. +1 more
We have developed in the last decade a two-dimensional version of the Titan global circulation model LMDZ. This model accounts for multiple coupling occuring on Titan between dynamics, haze, chemistry and radiative transfer. It was successful at explaining many observed features related to atmosphere state (wind, temperature), haze structure and c…
The k-filtering technique applied to wave electric and magnetic field measurements from the Cluster satellites
Sahraoui, Fouad; André, Mats; Cornilleau-Wehrlin, Nicole +2 more
The k-filtering technique is a method to characterize stationary fluctuations in space plasmas in terms of the wave energy distribution in the frequency and wave vector space. It has the ability to distinguish between wave modes of the same frequency in the spacecraft frame of reference, but with different wave vectors. This method is based on sim…
Cassini UVIS observations of Jupiter's auroral variability
Dougherty, Michele K.; West, Robert A.; Gurnett, Donald A. +20 more
The Cassini spacecraft Ultraviolet Imaging Spectrograph (UVIS) obtained observations of Jupiter's auroral emissions in H 2 band systems and H Lyman- α from day 275 of 2000 (October 1), to day 81 of 2001 (March 22). Much of the globally integrated auroral variability measured with UVIS can be explained simply in terms of the rotation of …
SDSS J140228.22+632133.3: A New Spectroscopically Selected Gravitational Lens
Treu, Tommaso; Koopmans, Léon V. E.; Bolton, Adam S. +2 more
We present Gemini integral-field unit spectroscopy and Hubble Space Telescope (HST) F435W- and F814W-band images of a newly discovered four-image gravitational lens, SDSS J140228.22+632133.3 (hereafter SDSSJ1402). The system is the first of 49 spectroscopically selected gravitational lens candidates to be imaged with the Advanced Camera for Survey…
The HST view of the nuclear emission line region in low luminosity radio-galaxies
Capetti, A.; Chiaberge, M.; Verdoes Kleijn, G.
We study the properties of the emission line regions in two samples of low luminosity radio-galaxies, while focusing on the Compact Emission Line Region (CELR) revealed to be a characteristic feature of these objects by HST narrow-band imaging. We find a strong correlation between line and optical continuum nuclear emission, which suggests that th…
A Chandra observation of the X-ray environment and jet of 3C 296
Hardcastle, M. J.; Birkinshaw, M.; Worrall, D. M. +2 more
We have observed the twin-jet radio galaxy 3C 296 with Chandra. X-ray emission is detected from the nucleus, from the inner parts of the radio jet and from a small-scale thermal environment around the jet deceleration region. As we have found in previous observations of other twin-jet radio galaxies, the X-ray jet and a steep pressure gradient in …
Submillimetre detection of a high-redshift type 2 QSO
Dunlop, J. S.; Rigopoulou, D.; Tozzi, P. +6 more
We report on the first SCUBA detection of a type 2 QSO at z= 3.660 in the Chandra Deep Field South. This source is X-ray-absorbed, shows only narrow emission lines in the optical spectrum and is detected in the submillimetre: it is the ideal candidate in an evolution scheme for active galactic nuclei (AGN) (e.g. Fabian 1999; Page et al. 2004) of a…