Search Publications
Reflectance spectra of Titan tholin between 7000 and 10 cm-1. Interpretation of Cassini/CIRS observation of Saturn's satellite Phoebe
Barucci, M. A.; Dotto, E.; Brucato, J. R. +3 more
Context. Laboratory experiments provide a great support to astronomical studies in that they are the most suited technique to reproduce, model and interpret the observational data.
Aims: We investigate the spectroscopic properties of particulate and flat slab of tholin samples in a wide MIR and FIR spectral range at cryogenic temperature to c…
TYC 2675-663-1: a newly discovered W UMa system in an active state
Montesinos, B.; Ribas, I.; Mas-Hesse, J. M. +4 more
Aims: The recently discovered eclipsing binary system TYC 2675-663-1 is an X-ray source and shows properties in the optical that are similar to the W UMa systems, but are somewhat unusual compared to what is seen in other contact binary systems. The goal of this work is to characterize its properties and investigate its nature by means of det…
The evolution of planetary nebulae. VI. On the chemical composition of the metal-poor PN G135.9+55.9
Steffen, M.; Roth, M. M.; Schönberner, D. +2 more
The actual value of the oxygen abundance of the metal-poor planetary nebula
INTEGRAL probes the morphology of the Crab nebula in hard X-rays/soft γ-rays
Eckert, D.; Ferrigno, C.; Savchenko, V. +1 more
Aims: We use the IBIS/ISGRI telescope on-board INTEGRAL to measure the position of the centroid of the 20-200 keV emission from the Crab region.
Methods: We find that the astrometry of the IBIS telescope is affected by the temperature of the IBIS mask during the observation. After correcting for this effect, we show that the systematic e…
Discovery of a magnetic neutron star in X-ray transient IGR J01583+6713
Wang, W.
Aims: IGR J01583+6713 is a new transient source discovered by the INTEGRAL/IBIS hard X-ray surveys. Optical observations have provided evidence that it is a high mass X-ray binary, but its nature remains unclear.
Methods: We used the INTEGRAL/IBIS data to study IGR J01583+6713 during its outburst.
Results: We present the temporal pr…
VLT observations of the middle-aged pulsar PSR B1055-52
Mignani, R. P.; Jackson, A. C.; Spiers, A.
Context. The 535 kyear old radio pulsar B1055-52 is the oldest of the “Three Musketeers”, the group of the middle-aged pulsars (the other two being PSR B0656+14 and Geminga) with bright soft X-ray and high-energy γ-ray emission. The identification of its optical counterpart has been only recently confirmed through observations performed with the H…
Fine-scale density wave structure of Saturn's rings: A hydrodynamic theory
Gedalin, M.; Griv, E.
Aims: We examine the linear stability of the Saturnian ring disk of mutually gravitating and physically colliding particles with special emphasis on its fine-scale ~100 m density wave structure, that is, almost regularly spaced, aligned cylindric density enhancements and optically-thin zones with the width and the spacing between them of roug…
A microflare with hard X-ray-correlated gyroresonance line emission at 314 MHz
Veronig, A.; Aurass, H.; Rausche, G. +1 more
Context. Small energy release events in the solar corona can give insights into the flare process which are regularly hidden in the complex morphology of larger events. For one case we find a narrowband radio signal well correlated with the hard X-ray flare. We investigate wether these signals are probes for the flare current sheet.
Aims: We …
INTEGRAL and Swift/XRT observations of the source PKS 0208-512
Torres, D. F.; Zhang, S.; Wang, J. -M. +3 more
Aims: The active galaxy PKS 0208-512, detected at lower energies by COMPTEL, has been claimed to be a MeV blazar from EGRET. We report on the most recent INTEGRAL observations of the blazar PKS 0208-512, which are supplemented by Swift ToO observations.
Methods: The high energy X-ray and γ-ray emission of PKS 0208-512 during August-Decem…
Using a new set of space-borne particle monitors to investigate solar-terrestrial relations
Anastasiadis, A.; Daglis, I. A.; Tziotziou, K. +2 more
Context. We investigated the solar origin of Solar Particle Events (SPEs) which occurred during four time periods of the 23rd solar cycle with intense solar activity and were detected by the Standard Radiation Environment Monitor (SREM) onboard the INTEGRAL satellite. SREM is a second generation ESA particle radiation monitor, already flying onboa…