Search Publications
Multiwavelength observations of a giant flare on CN Leonis. I. The chromosphere as seen in the optical spectra
Liefke, C.; Schmitt, J. H. M. M.; Reiners, A. +1 more
Aims: Flares on dM stars contain plasmas at very different temperatures and thus affect a wide wavelength range in the electromagnetic spectrum. While the coronal properties of flares are studied best in X-rays, the chromosphere of the star is observed best in the optical and ultraviolet ranges. Therefore, multiwavelength observations are essentia…
Temperature structure of the intergalactic medium within seven nearby and bright clusters of galaxies observed with XMM-Newton
Bourdin, H.; Mazzotta, P.
Aims:Using a newly developed algorithm, we map, to the highest angular resolution allowed by the data, the temperature structure of the intra-cluster medium (ICM) within a nearly complete X-ray flux limited sample of galaxy clusters in the redshift range between {z}=0.045 and {z}=0.096. Our sample contains seven bright clusters of galaxies observe…
GMASS ultradeep spectroscopy of galaxies at z ∼2. III. The emergence of the color bimodality at z ∼2
Berta, S.; Cimatti, A.; Daddi, E. +12 more
Aims: The aim of this work is to study the evolution of the rest-frame color distribution of galaxies with the redshift, in particular in the critical interval 1.4<z<3.
Methods: We combined ultradeep spectroscopy from the GMASS project (Galaxy Mass Assembly ultradeep Spectroscopic Survey) with GOODS multi-band photometry (from optical to…
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses. VII. Time delays and the Hubble constant from WFI J2033-4723
Magain, P.; Kochanek, C. S.; Meylan, G. +10 more
Gravitationally lensed quasars can be used to map the mass distribution in lensing galaxies and to estimate the Hubble constant H0 by measuring the time delays between the quasar images. Here we report the measurement of two independent time delays in the quadruply imaged quasar WFI J2033-4723 (z = 1.66). Our data consist of R-band imag…
Molecular Gas in NUclei of GAlaxies (NUGA). IX. The decoupled bars and gas inflow in NGC 2782
Tacconi, L. J.; Hunt, L. K.; Krips, M. +8 more
We present CO(1-0) and CO(2-1) maps of the starburst/Seyfert 1 galaxy NGC 2782 obtained with the IRAM interferometer, at 2.1 arcsec×1.5 arcsec and 0.7 arcsec×0.6 arcsec resolution respectively. The CO emission is aligned along the stellar nuclear bar of radius ~1 kpc, configured in an elongated structure with two spiral arms at high pitch angle ~9…
Circumstellar water vapour in M-type AGB stars: radiative transfer models, abundances, and predictions for HIFI
Olofsson, H.; Schöier, F. L.; Bergman, P. +2 more
Context: Surprisingly high amounts of H2O have recently been reported in the circumstellar envelope around the M-type asymptotic giant branch star W Hya. This has lead to the speculation that evaporation of icy cometary or planetary bodies might be an effective ongoing mechanism in such systems. However, substantial uncertainties remain, as the re…
SOHO/SUMER observations of prominence oscillation before eruption
Solanki, S. K.; Innes, D. E.; Chen, P. F.
Context: Coronal mass ejections (CMEs), as a large-scale eruptive phenomenon, often reveal some precursors in the initiation phase, e.g., X-ray brightening, filament darkening, etc., which are useful for CME modelling and space weather forecasting.
Aims: With the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectroscopic observa…
Multi-wavelength spatially resolved analysis of quasi-periodic pulsations in a solar flare
Melnikov, V. F.; Nakariakov, V. M.; Inglis, A. R.
Aims: We aim to perform a spatially resolved analysis of a quasi-periodic pulsation event from 8th May 1998 using microwave data from the Nobeyama Radioheliograph and Radiopolarimeter, and X-ray data from the Yohkoh satellite.
Methods: Time spectra of the signals integrated over the emission source are constructed with the use of the Lomb-Scar…
IMAGES. II. A surprisingly low fraction of undisturbed rotating spiral disks at z ~ 0.6 The morpho-kinematical relation 6 Gyr ago
Cesarsky, C.; Östlin, G.; Yang, Y. +21 more
We present a first combined analysis of the morphological and dynamical properties for the intermediate-mass Galaxy Evolution Sequence (IMAGES) sample. It is a representative sample of 52 z∼0.6 galaxies with M_stell from 1.5 to 15 × 1010~M⊙ that possesses 3D resolved kinematics and HST deep imaging in at least two broad band …
Transiting exoplanets from the CoRoT space mission. IV. CoRoT-Exo-4b: a transiting planet in a 9.2 day synchronous orbit
Mazeh, T.; Aigrain, S.; Zucker, S. +32 more
CoRoT, the first space-based transit search, provides ultra-high-precision light curves with continuous time-sampling over periods of up to 5 months. This allows the detection of transiting planets with relatively long periods, and the simultaneous study of the host star's photometric variability. In this Letter, we report the discovery of the tra…