Search Publications
Prometheus and Pandora: masses and orbital positions during the Cassini tour
French, Richard G.; Sicardy, Bruno; Renner, Stéfan
Hubble Space Telescope ( HST) images of Prometheus and Pandora show longitude discrepancies of about 20° with respect to the Voyager ephemerides, with an abrupt change in mean motion at the end of 2000 (French et al., 2003, Icarus 162, 143-170; French and McGhee, 2003, Bull. Am. Astron. Soc. 34, 06.07). These discrepancies are anti-correlated and …
XMM-Newton detection of type I X-ray bursts in M 31
Pietsch, W.; Haberl, F.
We searched for X-ray bursts in XMM-Newton archival data of X-ray sources in
Host Galaxy Evolution in Radio-Loud Active Galactic Nuclei
Urry, C. Megan; O'Dowd, Matthew
We investigate the luminosity evolution of the host galaxies of radio-loud active galactic nuclei (AGNs) through Hubble Space Telescope imaging of 72 BL Lac objects, including new Space Telescope Imaging Spectrograph (STIS) imaging of nine z>0.6 BL Lacs. With their intrinsically low accretion rates and their strongly beamed jets, BL Lac objects…
The ground calibration setup of OMEGA and VIRTIS experiments: description and performances
Langevin, Yves; Gondet, Brigitte; Bonello, Guillaume +4 more
Hyperspectral imagery is an essential technique for remote sensing of surfaces and atmospheres of planetary objects. However, given the instrumental complexity of coupling imaging and spectroscopy, in particular in the infrared, an in-depth ground calibration is mandatory to enable an unbiased and optimized data reduction. This paper presents the …
Luminosity segregation in three clusters of galaxies (A119, A2443, A2218)
Driver, Simon P.; De Propris, Roberto; Nulsen, Paul E. J. +2 more
We use deep wide-field V-band imaging obtained with the Wide Field Camera at the prime focus of the Issac Newton Telescope to study the spatial and luminosity distribution of galaxies in three low redshift (0.04 < z < 0.2) clusters: Abell 119, Abell 2443 and Abell 2218. The absolute magnitude limits probed in these clusters are MV…
Cluster Observations of the CUSP: Magnetic Structure and Dynamics
Escoubet, C. P.; Balogh, A.; Dandouras, I. +12 more
This paper reviews Cluster observations of the high altitude and exterior (outer) cusp, and adjacent regions in terms of new multi-spacecraft analysis and the geometry of the surrounding boundary layers. Several crossings are described in terms of the regions sampled, the boundary dynamics and the electric current signatures observed. A companion …
The Leo Triplet: Common origin or late encounter?
Sil'chenko, O. K.; Afanasiev, V. L.
The kinematics, structure, and stellar population properties in the centers of two early-type spiral galaxies of the Leo Triplet, NGC 3627 and NGC 3623, are studied by means of integral-field spectroscopy. Unlike our previous targets, NGC 3384/NGC 3368 in the Leo I Group and NGC 5574/NGC 5576 in LGG 379, NGC 3623 and NGC 3627 do not appear to expe…
Modeling of Cluster's electric antennas in space: Application to plasma diagnostics
Sundkvist, D.; Pickett, J.; Lefebvre, B. +2 more
The main characteristics of the long-boom electric antennas installed on board the Cluster satellites are derived from finite element modeling in a kinetic and isotropic space plasma, in the frequency range of about 1-100 kHz. The model is based on the surface charge distribution method in quasi-static conditions. The impedances of both types of a…
XMM-Newton observation of the young open cluster Blanco 1. II. X-ray time variability and flares
Micela, G.; Reale, F.; Sciortino, S. +1 more
We study the X-ray variability of the young open cluster Blanco 1 observed with the EPIC camera on board the XMM-Newton X-ray observatory. The time coverage of EPIC observations has allowed us to address short time scale (hours) variability, while the comparison with previous ROSAT observations has allowed us to investigate the variability on time…
Geometrical constraints upon the unipolar model of V407 Vul and RXJ0806.3+1527
Wilms, J.; Marsh, T. R.; Groot, P. +5 more
V407 Vul and RX J0806.3+1527 are X-ray emitting stars with X-ray light curves that are 100 per cent modulated on periods of 569 and 321 s, respectively. These periods and no others are also seen at optical and infrared wavelengths. These properties have led to the suggestion that the periods are the orbital periods of ultracompact pairs of white d…