Search Publications
Photometric observations of asteroid 4 Vesta by the OSIRIS cameras onboard the Rosetta spacecraft
Sierks, H.; Mottola, S.; Barucci, M. A. +2 more
Aims: We report on new observations of asteroid 4 Vesta obtained on 1 May 2010 with the optical system OSIRIS onboard the ESA Rosetta mission. One lightcurve was taken at a phase angle (52°) larger than achievable from ground-based observations together with a spectrophotometric sequence covering the 260 to 990 nm wavelength range.
Metho…
Searching for the 511 keV annihilation line from galactic compact objects with the IBIS gamma ray telescope
De Cesare, G.
Context. The first detection of a gamma ray line with an energy of about 500 keV from the center of our Galaxy dates back to the early seventies. Thanks to the astrophysical application of high spectral resolution detectors, it was soon clear that this radiation was due to the 511 keV photons generated by electron-positron annihilation. Even thoug…
Recovering Swift-XRT energy resolution through CCD charge trap mapping
Campana, S.; Cusumano, G.; Moretti, A. +13 more
The X-ray telescope on board the Swift satellite for gamma-ray burst astronomy has been exposed to the radiation of the space environment since launch in November 2004. Radiation causes damage to the detector, with the generation of dark current and charge trapping sites that result in the degradation of the spectral resolution and an increase of …
Extreme warm absorber variability in the Seyfert galaxy Mrk 704
Bianchi, S.; Ponti, G.; Guainazzi, M. +8 more
Context. In about half of the Seyfert galaxies, the X-ray emission is absorbed by an optically thin, ionized medium, the so-called "warm absorber", whose origin and location is still a matter of debate.
Aims: The aim of this paper is to constrain the warm absorber further by studying its variability.
Methods: We analyzed the X-ray spectr…
The 2008 outburst of IGR J17473-2721: evidence for a disk corona?
Torres, D. F.; Zhang, S.; Kretschmar, P. +4 more
Context. The 2008 outburst of the atoll source IGR J17473-2721 was observed by INTEGRAL, RXTE and Swift. Tens of type-I X-ray bursts were found in this outburst.
Aims: Joint observations by INTEGRAL, RXTE, and Swift provide sufficient data to look into the behavior of IGR J17473-2721 at the rising part of the 2008 outburst. The relation betwe…
The new carbon symbiotic star IPHAS J205836.43+503307.2
Munari, U.; Corradi, R. L. M.; Angeloni, R. +5 more
Aims: We are performing a search for symbiotic stars using IPHAS, the INT Hα survey of the northern Galactic plane, and follow-up observations.
Methods: Candidate symbiotic stars are selected on the basis of their IPHAS and near-IR colours, and spectroscopy and photometry are obtained to determine their nature. We present here observatio…
The XMM-Newton survey of the Small Magellanic Cloud: a new X-ray view of the symbiotic binary SMC 3
Pietsch, W.; Haberl, F.; Greiner, J. +7 more
Context. The XMM-Newton survey of the Small Magellanic Cloud (SMC) was performed to study the population of X-ray sources in this neighbouring galaxy. During one of the observations, the symbiotic binary SMC 3 was found at its highest X-ray luminosity as observed until now.
Aims: In SMC 3 wind accretion from a giant donor star onto a white dw…
Is it possible to model observed active region coronal emission simultaneously in EUV and X-ray filters?
Karlický, M.; Dzifčáková, E.; Dudík, J. +1 more
Aims: We investigate the possibility of modeling the active region coronal emission in the EUV and X-ray filters using one, universal, steady heating function, tied to the properties of the magnetic field.
Methods: We employ a simple, static model to compute the temperature and density distributions in the active region corona. The model…
Exploring the galaxy cluster-group transition regime at high redshifts. Physical properties of two newly detected z > 1 systems
Böhringer, H.; Pratt, G. W.; Rosati, P. +11 more
Context. Multi-wavelength surveys for clusters of galaxies are opening a window on the elusive high-redshift (z > 1) cluster population. Well controlled statistical samples of distant clusters will enable us to answer questions about their cosmological context, early assembly phases and the thermodynamical evolution of the intracluster medium. …
High-resolution mapping of the physical conditions in two nearby active galaxies based on 12CO(1-0), (2-1), and (3-2) lines
Krips, M.; Schinnerer, E.; Baker, A. J. +7 more
We present a detailed analysis of high resolution observations of the three lowest CO transitions in two nearby active galaxies, NGC 4569 and NGC 4826. The CO(1-0) and (2-1) lines were observed with the Plateau de Bure Interferometer and the CO(3-2) line with the Submillimeter Array. Combining these data allows us to compare the emission in the th…