Search Publications
TiO and VO broad band absorption features in the optical spectrum of the atmosphere of the hot-Jupiter HD 209458b
Ehrenreich, D.; Ferlet, R.; Vidal-Madjar, A. +4 more
Aims: The presence of titanium oxide (TiO) and vanadium oxide (VO) gas phase species is searched for in the atmosphere of the hot Jupiter
Methods: We compared a model for the planet's transmitted spectrum to multi-wavelength eclipse-depth measurements (from 3000 to 10 000 Å) using archived HST-STIS time series sp…
Strong lensing in Abell 1703: constraints on the slope of the inner dark matter distribution
Kneib, J. -P.; Pelló, R.; Egami, E. +9 more
Properties of dark matter haloes can be probed observationally and numerically, and comparing both approaches provides ways to constrain cosmological models. When it comes to the inner part of galaxy cluster scale haloes, interaction between the baryonic and the dark matter component is an important issue that is far from being fully understood. W…
IMAGES. I. Strong evolution of galaxy kinematics since z = 1
Cesarsky, C.; Östlin, G.; Yang, Y. +20 more
Nearly half the stellar mass of present-day spiral galaxies has formed since z = 1, and galaxy kinematics is an ideal tool to identify the underlying mechanisms responsible for the galaxy mass assembly since that epoch. Here, we present the first results of the ESO large program, “IMAGES”, which aims at obtaining robust measurements of the kinemat…
Pulsar timing for the Fermi gamma-ray space telescope
Camilo, F.; Dumora, D.; Guillemot, L. +25 more
We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The detection and study of pulsars in gamma rays give insights into the populations of neutron stars and supernova rates in the Galaxy, into particle acceleration mechanisms in neutron star magnetospher…
Coronal magnetic field measurement using loop oscillations observed by Hinode/EIS
Young, P. R.; Nakariakov, V. M.; Verwichte, E. +1 more
We report the first spectroscopic detection of a kink MHD oscillation of a solar coronal structure by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on the Japanese Hinode satellite. The detected oscillation has an amplitude of 1 km s-1 in the Doppler shift of the FeXII 195 Å spectral line (1.3~MK), and a period of 296~s. The unique…
Non-LTE line formation for heavy elements in four very metal-poor stars
Zhao, G.; Mashonkina, L.; Aoki, W. +6 more
Aims:Stellar parameters and abundances of Na, Mg, Al, K, Ca, Sr, Ba, and Eu are determined for four very metal-poor (VMP) stars (-2.15 ≥ [Fe/H] ≥ -2.66). For two of them, HD 84937 and HD 122563, the fraction of the odd isotopes of Ba derived for the first time.
Methods: Determination of an effective temperature, surface gravity, and element ab…
A new activity phase of the blazar 3C 454.3 . Multifrequency observations by the WEBT and XMM-Newton in 2007-2008
Lee, C. -U.; Pian, E.; Lähteenmäki, A. +72 more
Aims: The Whole Earth Blazar Telescope (WEBT) consortium has been monitoring the blazar
Methods: We present and analyse the multifrequency results of the 2007-2008 observing season, including XMM-Newton observations and near…
The cosmological properties of AGN in the XMM-Newton Hard Bright Survey
Page, M. J.; Carrera, F. J.; Caccianiga, A. +7 more
Aims: We investigate here the X-ray luminosity function (XLF) of absorbed (NH between 4 × 1021 and 1024 cm-2) and unabsorbed (NH < 4 × 1021 cm-2) AGN, the fraction of absorbed AGN as a function of LX (and z), the intrinsic NH distribution of the A…
Near-infrared mapping and physical properties of the dwarf-planet Ceres
Berthier, J.; Carry, B.; Hestroffer, D. +5 more
Aims:We study the physical characteristics (shape, dimensions, spin axis direction, albedo maps, mineralogy) of the dwarf-planet Ceres based on high angular-resolution near-infrared observations.
Methods: We analyze adaptive optics J/H/K imaging observations of Ceres performed at Keck II Observatory in September 2002 with an equivalent spatial…
Detailed high-energy characteristics of AXP 4U 0142+61. Multi-year observations with INTEGRAL, RXTE, XMM-Newton, and ASCA
Knödlseder, J.; Kuiper, L.; Hermsen, W. +4 more
4U 0142+61 is one of the Anomalous X-ray Pulsars exhibiting hard X-ray emission above 10 keV discovered with INTEGRAL. In this paper we present detailed spectral and temporal characteristics both in the hard X-ray (>10 keV) and soft X-ray (<10 keV) domains obtained using data from INTEGRAL, XMM-Newton, ASCA and RXTE. Accumulating data collec…