Search Publications
Sensitivity of helioseismic gravity modes to the dynamics of the solar core
Eff-Darwich, A.; García, R. A.; Mathur, S. +1 more
Context: The dynamics of the solar core cannot be properly constrained through the analysis of acoustic oscillation modes. Gravity modes (g modes) are necessary to understand the structure and dynamics of the deepest layers of the Sun. Through recent progress on the observation of these modes - both individually and collectively - new information …
Identifying XMM-Newton observations affected by solar wind charge exchange. Part I
Carter, J. A.; Sembay, S.
Aims: We describe a method for identifying XMM-Newton observations that have been affected by solar wind charge exchange (SWCX) emission and present preliminary results of previously unidentified cases of such emission within the XMM-Newton Science Archive.
Methods: The method is based on detecting temporal variability in the diffuse X-ray bac…
Discovery of a VHE gamma-ray source coincident with the supernova remnant CTB 37A
Santangelo, A.; Quirrenbach, A.; Ripken, J. +148 more
Aims: The supernova remnant (SNR) complex CTB 37 is an interesting candidate for observations with very high energy (VHE) γ-ray telescopes such as HESS. In this region, three SNRs are seen. One of them is potentially associated with several molecular clouds, a circumstance that can be used to probe the acceleration of hadronic cosmic rays.
Met…
First detection of hydroxyl in the atmosphere of Venus
Gondet, B.; Erard, S.; Drossart, P. +41 more
Context: Airglow emissions, such as previously observed from NO and O2(a-X) (0-0) on Venus, provide insight into the chemical and dynamical processes that control the composition and energy balance in the upper atmospheres of planets. The OH airglow emission has been observed previously only in the Earth's atmosphere where it has been used to infe…
On Lyman-line asymmetries in quiescent prominences
Heinzel, P.; Anzer, U.; Schmieder, B. +1 more
Aims: We study the asymmetries of the synthetic hydrogen Lyman lines and the process responsible for their formation.
Methods: To obtain the synthetic Lyman line profiles, we use a multi-thread prominence fine-structure model consisting of identical 2D threads. The 2D thread models are in MHS equilibrium, include an empirical prominence-corona…
The ultraluminous X-ray source NGC 1313 X-2. Its optical counterpart and environment
Motch, C.; Soria, R.; Böttcher, M. +4 more
NGC 1313 X-2 is one of the brightest ultraluminous X-ray sources in the sky, at both X-ray and optical wavelengths; therefore, quite a few studies of available ESO VLT and HST data have appeared in the literature. Here, we present our analysis of VLT/FORS1 and HST/ACS photometric data, confirming the identification of the B ~ 23 mag blue optical c…
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…