Search Publications
Accurate fundamental parameters of CoRoT asteroseismic targets. The solar-like stars HD 49933, HD 175726, HD 181420, and HD 181906
Bruntt, H.
Context: The CoRoT satellite has provided high-quality light curves of several solar-like stars. Analysis of these light curves provides oscillation frequencies that make it possible to probe the interior of the stars. However, additional constraints on the fundamental parameters of the stars are important for the theoretical modelling to be succe…
A candidate tidal disruption event in the Galaxy cluster Abell 3571
Greiner, J.; Esquej, P.; Salvato, M. +8 more
Context: Tidal disruption events are possible sources of temporary nuclear activity in galactic nuclei and can be considered as good indicators of the existence of supermassive black holes in the centers of galaxies.
Aims: A new X-ray source has been detected serendipitously with ROSAT in a PSPC pointed observation of the galaxy cluster A3571.…
The size distribution of magnetic bright points derived from Hinode/SOT observations
Möstl, C.; Veronig, A.; Utz, D. +3 more
Context: Magnetic bright points (MBPs) are small-scale magnetic features in the solar photosphere. They may be a possible source of coronal heating by rapid footpoint motions that cause magnetohydrodynamical waves. The number and size distribution are of vital importance in estimating the small scale-magnetic-field energy.
Aims: The size distr…
Resolved 24.5 micron emission from massive young stellar objects
Onaka, T.; Kataza, H.; Hoare, M. G. +8 more
Context: Massive young stellar objects (MYSO) are surrounded by massive dusty envelopes, whose physical structure and geometry are determined by the star formation process.
Aims: Our principal aim is to establish the density structure of MYSO envelopes on scales of ~1000 AU. This constitutes an increase of a factor ~10 in angular resolution co…
CAIXA: a catalogue of AGN in the XMM-Newton archive. II. Multiwavelength correlations
Bianchi, S.; Ponti, G.; Guainazzi, M. +2 more
Aims: The availability of large amounts of multiwavelength data allows us to perform an extensive statistical analysis to look for correlations between different parameters of AGN. The physical implications of these correlations, when considered within the framework of current AGN models, can be enlightening in the resolution of the problems and t…
The secondary eclipse of CoRoT-1b
Mazeh, T.; Aigrain, S.; Alapini, A. +33 more
The transiting planet CoRoT-1b is thought to belong to the pM-class of planets, in which the thermal emission dominates in the optical wavelengths. We present a detection of its secondary eclipse in the CoRoT white channel data, whose response function goes from ~400 to ~1000 nm. We used two different filtering approaches, and several methods to e…
Spectral and intensity variations of Galactic 26Al emission
Wang, W.; Strong, A. W.; Knödlseder, J. +9 more
Aims: Gamma-ray line emission from the radioactive decay of 26Al reflects nucleosynthesis in massive stars and supernovae. We use INTEGRAL 26Al measurements to characterize the distribution and characteristics of 26Al source regions throughout the Galaxy.
Methods: The spectrometer SPI aboard INTEGRAL has accumu…
The large-scale shock in the cluster of galaxies Hydra A
Finoguenov, A.; Böhringer, H.; Simionescu, A. +5 more
We analyzed a deep XMM-Newton observation of the cluster of galaxies Hydra A, focusing on the large-scale shock discovered in Chandra images as a discontinuity in the surface brightness. The shock front can be seen both in the pressure map and in temperature profiles in several sectors. We compared the results of a spherically symmetric hydrodynam…
The Quintuplet cluster. I. A K-band spectral catalog of stellar sources
Hamann, W. -R.; Oskinova, L. M.; Liermann, A.
Context: Three very massive clusters are known to reside in the Galactic center region, the Arches cluster, the Quintuplet cluster, and the central parsec cluster, each of them rich in young hot stars. With new infrared instruments, this region is no longer obscured for the observer.
Aims: For understanding these very massive clusters, it is e…
HST/STIS observations of the RW Aurigae bipolar jet: mapping the physical parameters close to the source
Ray, T. P.; Eislöffel, J.; Bacciotti, F. +2 more
Context: We present the results of new spectral diagnostic investigations applied to high-resolution long-slit spectra obtained with the Hubble Space Telescope Imaging Spectrograph (HST/STIS) of the jet from the T Tauri star RW Aur.
Aims: Our primary goal is to determine basic physical parameters (electron density ne and electron te…