Search Publications
Open magnetic flux tubes in the corona and the transport of solar energetic particles
Krucker, S.; Klein, K. -L.; Lointier, G. +1 more
We investigate how magnetic fields guide energetic particles through the corona into interplanetary space and eventually to a spacecraft near the Earth. A set of seven simple particle events is studied, where energetic electrons (30-500 keV; Wind spacecraft) or protons (5-55 MeV; SoHO) were released together with low-energy electron beams producin…
Recent star formation in nearby 3CR radio-galaxies from UV HST observations
Capetti, A.; Baldi, R. D.
We analyzed HST images of 31 nearby (z ≲ 0.1) 3CR radio-galaxies. We compared their UV and optical images to detect evidence of recent star formation. Six objects were excluded because they are highly nucleated or had very low UV count rates. After subtracting the emission from their nuclei and/or jets, 12 of the remaining 25 objects, presenting a…
Detailed high-energy characteristics of AXP 1RXS J170849-400910. Probing the magnetosphere using INTEGRAL, RXTE, and XMM-Newton
Kuiper, L.; Hermsen, W.; den Hartog, P. R.
1RXS J170849-400910 is one of four anomalous X-ray pulsars which emit persistent luminous radiation in soft X-rays (<10 keV) as well as in hard X-rays (>10 keV). In this paper we present detailed spectral and temporal characteristics over the whole X-ray band. For this purpose data have been used from INTEGRAL, RXTE and XMM-Newton. The hard …
Realistic simulations of gravitational lensing by galaxy clusters: extracting arc parameters from mock DUNE images
Heymans, C.; De Lucia, G.; Grazian, A. +6 more
Aims: We present a newly developed code that allows simulations of optical observations of galaxy fields with a variety of instruments. The code incorporates gravitational lensing effects and is targeted at simulating lensing by galaxy clusters. Our goal is to create the tools required for comparing theoretical expectations with observations to be…
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…