Search Publications
X-ray emission from dense plasma in classical T Tauri stars: hydrodynamic modeling of the accretion shock
Orlando, S.; Peres, G.; Reale, F. +3 more
Context: High spectral resolution X-ray observations of classical T Tauri stars (CTTSs) demonstrate the presence of plasma at temperature T∼ 2-3× 106 K and density n_e∼ 1011-1013 cm-3, which are unobserved in non-accreting stars. Stationary models suggest that this emission is due to shock-heated accreti…
VLT-VIMOS integral field spectroscopy of luminous and ultraluminous infrared galaxies. I. The sample and first results
Colina, L.; Monreal-Ibero, A.; Arribas, S. +3 more
Context: (Ultra)Luminous Infrared Galaxies [(U)LIRGs] are much more numerous at cosmological distances than locally, and are likely the precursors of elliptical galaxies. Studies of the physical structure and kinematics of representative samples of these galaxies at low redshift are needed in order to understand the interrelated physical processes…
Asteroids 2867 Steins and 21 Lutetia: surface composition from far infrared observations with the Spitzer space telescope
Jorda, L.; Lamy, P. L.; Barucci, M. A. +8 more
Aims:The aim of this paper is to investigate the surface composition of the two asteroids 21 Lutetia and 2867 Steins, targets of the Rosetta space mission.
Methods: We observed the two asteroids through their full rotational periods with the Infrared Spectrograph of the Spitzer Space Telescope to investigate the surface properties. The analysi…
The correlation between blue straggler and binary fractions in the core of Galactic globular clusters
Beccari, G.; Ferraro, F. R.; Fusi Pecci, F. +2 more
Context: Blue stragglers stars (BSSs) are thought to form in globular clusters by two main formation channels: i) mergers induced by stellar collisions; and ii) coalescence or mass transfer between companions in binary systems. The detailed study of the BSS properties is therefore crucial for understanding the binary evolution mechanisms and the c…
Magnetic fields and gas in the cluster-influenced spiral galaxy NGC 4254. II. Structures of magnetic fields
Chyży, K. T.
Aims: The origin of asymmetric radio polarized emission in the Virgo Cluster spiral NGC 4254 is investigated and the influence of cluster environment on the properties of magnetic fields is explored.
Methods: Structures of magnetic fields are analyzed with the concept of “magnetic maps”, presenting distributions of different magnetic field com…
Hard X-ray emission from η Carinae
Walter, R.; Rauw, G.; Leyder, J. -C.
Context: If relativistic particle acceleration takes place in colliding-wind binaries, hard X-rays and γ-rays are expected through inverse Compton emission, but to date these have never been unambiguously detected.
Aims: To detect this emission, observations of
A new view of quiet-Sun topology from Hinode/SOT
Régnier, S.; Parnell, C. E.; Haynes, A. L.
Context: With the recent launch of the Hinode satellite our view of the nature and evolution of quiet-Sun regions has been improved. In light of the new high resolution observations, we revisit the study of the quiet Sun's topological nature.
Aims: Topology is a tool to explain the complexity of the magnetic field, the occurrence of reconnecti…
High-resolution optical spectroscopy of Plaskett's star
Martins, F.; Gosset, E.; Rauw, G. +3 more
Context: Plaskett's star (
Radio-to-UV monitoring of AO 0235+164 by the WEBT and Swift during the 2006-2007 outburst
Lee, C. -U.; Lähteenmäki, A.; Umana, G. +58 more
Context: The blazar
GMASS ultradeep spectroscopy of galaxies at z ~ 2 . I. The stellar metallicity
Berta, S.; Cimatti, A.; Daddi, E. +12 more
Context: Galaxy metallicities have been measured to redshift z∼2 by gas-phase oxygen abundances of the interstellar medium using the R{23} and N2 methods. Galaxy stellar metallicities provide crucial data for chemical evolution models but have not been assessed reliably much outside the local Universe.
Aims: We determine the iron-abundance, st…