Search Publications
Inflow Generated X-Ray Corona around Supermassive Black Holes and a Unified Model for X-Ray Emission
Cen, Renyue; Wang, Lile
Three-dimensional hydrodynamic simulations are performed, which cover the spatial domain from hundreds of Schwarzschild radii to 2 pc around the central supermassive black hole of mass {10}8{M}⊙ , with detailed radiative cooling processes. The existence of a significant amount of shock heated, high temperature (≥slant {10}
Building the analytical response in frequency domain of AC biased bolometers. Application to Planck/HFI
Montier, Ludovic; Sauvé, Alexandre
Context: Bolometers are high sensitivity detector commonly used in Infrared astronomy. The HFI instrument of the Planck satellite makes extensive use of them, but after the satellite launch two electronic related problems revealed critical. First an unexpected excess response of detectors at low optical excitation frequency for ν < 1 Hz, and se…
Refinement of Stereo Image Analysis Using Photometric Shape Recovery as AN Alternative to Bundle Adjustment
Mall, U.; Wöhler, C.; Grumpe, A. +3 more
Topographic mapping, e.g. the generation of Digital Elevation Models (DEM), is of general interest to the remote sensing community and scientific research. Commonly, photogrammetric methods, e.g. stereo image analysis methods (SIAM) or bundle adjustment methods (BAM), are applied to derive 3D information based on multiple images of an area. These …
An Historic Encounter: Reviewing the Outreach around ESA's Rosetta Mission
Lorenzen, D.
The Rosetta mission is a milestone in terms of science and public outreach. The European Space Agency and the Deutsches Zentrum für Luft- und Raumfahrt in particular did a marvellous job of sparking global public interest, driven by various events throughout the mission. In contrast, the actions of the Max Planck Society research group in charge o…
Observations of long-period oscillations of the solar active regions in the visible and UV spectral intervals
Tlatov, A. G.; Dormidontov, D. V.; Chernov, Ya. O.
The variation of intensity in spectral line wings, which was obtained from observations of the patrol telescope at the Kislovodsk Mountain Astronomical Station of the Pulkovo Observatory, Russian Academy of Science (KMAS) and the Interface Region Imaging Spectrograph (IRIS) space observatory, are considered. A series of observations lasting a few …
Spectral energy distribution, radio maps and polarization of Cygnus X-1: a lepto-hadronic model
Romero, G. E.; Vila, G. S.; Pepe, C.
The microquasar Cygnus X-1 is one of the most studied astrophysical sources. Several radiative models for the non-thermal broadband emission of Cygnus X-1 are available. For the jet emission in particular, only leptonic models have been considered despite the observational evidence of the presence of hadrons in the jets of other microquasars. In t…
Rosetta observes sublimating surface ices
Smith, Keith T.
Revisiting the Single-Fluid Modeling of the Solar Wind–Comet Interaction: Closer Look at the Cometosheath
Dryer, M.; Kartalev, M.; Keremidarska, V.
Earlier developed single fluid gas-dynamic model of solar wind–comet ionosphere interaction is applied to reveal some specifics in the morphology of the shocked "contaminated" solar wind region (cometosheath). The model is based on the Euler equations with added mass-loading, mass-loss and frictional force terms. Numerous reactions are taken into …
An Optimised System for Generating Multi-Resolution Dtms Using NASA Mro Datasets
Tao, Y.; Muller, J. -P.; Sidiropoulos, P. +2 more
Within the EU FP-7 iMars project, a fully automated multi-resolution DTM processing chain, called Co-registration ASP-Gotcha Optimised (CASP-GO) has been developed, based on the open source NASA Ames Stereo Pipeline (ASP). CASP-GO includes tiepoint based multi-resolution image co-registration and an adaptive least squares correlation-based sub-pix…
Discovery of a deep Seyfert-2 galaxy at z = 0.222 behind NGC 300
Gamen, R.; Combi, J. A.; García, F. +2 more
We report on the unveiling of the nature of the unidentified X-ray source 3XMM J005450.3-373849 as a Seyfert-2 galaxy located behind the spiral galaxy NGC 300 using Hubble Space Telescope data, new spectroscopic Gemini observations and available XMM-Newton and Chandra data. We show that the X-ray source is positionally coincident with an extended …