Search Publications
X-ray wind tomography of the highly absorbed HMXB IGR J17252-3616
Walter, R.; Manousakis, A.
Context. About ten persistently highly absorbed super-giant high-mass X-ray binaries (sgHMXB) have been discovered by INTEGRAL as bright hard X-ray sources lacking bright X-ray counterparts. Besides IGR J16318-4848, which has peculiar characteristics, the other members of this family share many properties with the classical wind-fed sgHMXB systems…
Suzaku observation of the LINER NGC 4102
Esquej, P.; Ebrero, J.; Papadakis, I. +11 more
Context. Low-ionisation, nuclear emission-line region (LINER) nuclei are said to be different from other active galactic nuclei (AGN) due to the presence of complex absorbing structures along the line-of-sight and/or an inefficient mode of accretion onto the supermassive black hole. However, this is still open.
Aims: We investigate the broad …
New X-ray observations of IQ Aurigae and α2 Canum Venaticorum. Probing the magnetically channeled wind shock model in A0p stars
Schmitt, J. H. M. M.; Robrade, J.
Aims: We re-examine the scenario of X-ray emission from magnetically confined/channeled wind shocks (MCWS) for Ap/Bp stars, a model originally developed to explain the ROSAT detection of the A0p star IQ Aur.
Methods: We present new X-ray observations of the A0p stars α2 CVn (Chandra) and IQ Aur (XMM-Newton) and discuss our fin…
The large-scale diffuse radio emission in A781
Bonafede, A.; Govoni, F.; Giovannini, G. +2 more
Context. A781 belongs to a complex system characterized by extended X-ray emissions that may form part of line of clusters of galaxies along a filament.
Aims: The aim of this work is to investigate the possible presence of extended, diffuse synchrotron radio emission connected to the intra-cluster medium of A781.
Methods: We studied the …
Investigation of mass flows in the transition region and corona in a three-dimensional numerical model approach
Peter, H.; Zacharias, P.; Bingert, S.
Context. The origin of solar transition region redshifts is not completely understood. Current research is addressing this issue by investigating three-dimensional magneto-hydrodynamic models that extend from the photosphere to the corona.
Aims: By studying the average properties of emission line profiles synthesized from the simulation runs …
The energetics of giant radio galaxy lobes from inverse Compton scattering observations
Colafrancesco, S.; Marchegiani, P.
Context. Giant radio galaxy (GRG) lobes are excellent laboratories for studying the evolution of the particle and magnetic field energetics and the past activity of radiogalaxy jets, as indicated by recent results of X-ray observations with Suzaku. However, these results are based on assumptions of the shape and extension of the GRG lobe electron …
Mid-infrared interferometry of the massive young stellar object NGC 2264 IRS 1
Grellmann, R.; Weigelt, G.; Preibisch, T. +3 more
Context. The optically invisible infrared-source NGC 2264 IRS 1 lying north of the Cone Nebula is thought to be a massive young stellar object (~10 M⊙). Although strong infrared excess clearly shows that the central object is surrounded by large amounts of circumstellar material, no information about the spatial distribution of this cir…
Optical dropout galaxies lensed by the cluster A2667
Schaerer, D.; Laporte, N.; Pelló, R. +8 more
Context. We investigate the nature and the physical properties of ten z, Y, and J-dropout galaxies selected in the field of the lensing cluster A2667.
Aims: This cluster is part of our project aimed at obtaining deep photometry at ~0.8-2.5 microns with ESO/VLT HAWK-I and FORS2 on a representative sample of lensing clusters extracted from our …
Monitoring the solar UV irradiance spectrum from the observation of a few passbands
Kretzschmar, M.; Dudok de Wit, T.; Cessateur, G. +3 more
Context. The solar irradiance in the UV is a key ingredient in space weather applications; however, because of the lack of continuous and long-term observations, various indices are still used today as surrogates for the solar spectral irradiance.
Aims: As an alternative to current spectrometers we use a few radiometers with properly chosen p…
Lunar mare single-scattering, porosity, and surface-roughness properties with SMART-1 AMIE
Koschny, D.; Foing, B.; Muinonen, K. +8 more
A novel shadowing and coherent-backscattering model is utilized in the analysis of the single-scattering albedos and phase functions, local surface roughness, and regolith porosity of specific lunar mare regions imaged by the AMIE camera (Advanced Moon micro-Imager Experiment) onboard ESA SMART-1 mission. Shadowing due to the regolith particles is…