Search Publications
The properties of asteroid (2867) Steins from Spitzer Space Telescope observations and OSIRIS shape reconstruction
Jorda, L.; Lamy, P.; Fornasier, S. +1 more
Aims: We report on the thermal properties and composition of asteroid (2867) Steins derived from an analysis of new Spitzer Space Telescope (SST) observations performed in March 2008, in addition to previously published SST observations performed in November 2005.
Methods: We consider the three-dimensional shape model and photometric pro…
Center-limb dependence of photospheric velocities in regions of emerging magnetic fields on the Sun
Khlystova, A.
Aims: We investigate the ratio of the vertical and horizontal velocities of the photospheric plasma flows in the region of emerging magnetic fields on the Sun.
Methods: We carried out a study of photospheric velocities during the first hours of the appearance of 83 active regions with magnetic flux more than 1021 Mx with data …
No apparent accretion mode changes detected in Centaurus X-3
Müller, D.; Klochkov, D.; Santangelo, A. +2 more
Aims: Two distinct spectral states have previously been reported for Cen X-3 on the basis of RXTE/ASM observations. Intrigued by this result, we investigated the spectral properties of the source using the enhanced possibilities of the X-ray data now available with the aim to clarify and interpret the reported behavior.
Methods: To check…
A search for X-ray sources around WR 22 in the Carina region
Gosset, E.; Nazé, Y.; Rauw, G. +2 more
We present the results of a deep search for X-ray sources in a circular field of 30' in diameter situated around WR 22 in the Carina region and observed with the XMM-Newton observatory. This field is broadly located to the west of the main part of the Carina nebula. On the basis of six pointings (nominal exposure time: 10 ks each) centred on the W…
Coronal properties of planet-bearing stars (Corrigendum)
Schmitt, J. H. M. M.; Robrade, J.; Poppenhaeger, K.
The jet of the BL Lacertae object PKS 2201+044: MAD near-IR adaptive optics observations and comparison with optical, radio and X-ray data
Moretti, A.; Falomo, R.; Treves, A. +14 more
Context. Relativistic jets are a common feature of radio loud active galactic nuclei. Multifrequency observations are a unique tool to constrain their physics.
Aims: We report on a detailed study of the properties of the jet of the nearby BL Lac object PKS 2201+044, one of the rare cases where the jet is detected from radio to X-rays.
Me…
The first GRB survey of the IBIS/PICsIT archive
Mereghetti, S.; Foschini, L.; Di Cocco, G. +6 more
Context. The multi-purpose INTEGRAL mission is continuously contributing to Gamma Ray Burst (GRB) science, thanks to the performances of its two main instruments, IBIS and SPI, operating in the hard X-ray / soft γ-ray domain.
Aims: We investigate the possibilities offered to the study of GRBs by PICsIT, the high-energy detector of the IBIS in…
Filament destabilization and CME release during a long duration flare
Romano, P.; Contarino, L.; Zuccarello, F. +3 more
Context. During complex and long duration solar flares, several filament destabilizations or eruptions can occur that are often related to coronal mass ejections (CMEs).
Aims: We describe the study of an X3.8 long duration event (LDE) that occurred in NOAA 10720 on 17 January 2005 and was characterized by three filament destabilizations and t…
Filaments and the magnetic configuration. I. Observation of the solar case
Meunier, N.; Delfosse, X.
Context. The emission of Ca and Hα is correlated for the Sun, but this does not seem to be true for other stars. We previously demonstrated that this lack of correlation could be due to the presence of filaments.
Aims: We aim to establish a link between the activity level, the magnetic configuration, and the number of filaments, and therefore…
VLT/FORS2 observations of the optical counterpart of the isolated neutron star RBS 1774
Haberl, F.; Motch, C.; Treves, A. +5 more
Context. The X-ray observations performed with the Röntgen Satellite (ROSAT) have led to the discovery of a group (seven to date) of X-ray dim and radio-silent, middle-aged isolated neutron stars (a.k.a. XDINSs), which are characterised by pure blackbody spectra (kT ≈ 40-100 eV) and long X-ray pulsations (P = 3-12 s), and appear to be endowed with…