Search Publications
The Planck SZ Cluster Catalog: expected X-ray properties
Bartlett, J. G.; Chamballu, A.; Melin, J. -B.
Surveys based on the Sunyaev-Zel'dovich (SZ) effect provide a fresh view of the galaxy cluster population, one that is complementary to X-ray surveys. To better understand the relation between these two kinds of survey, we construct an empirical cluster model using scaling relations constrained by current X-ray and SZ data. We apply our model to p…
Spectro-polarimetry of the bright side of Saturn's moon Iapetus
Tozzi, G. P.; Boehnhardt, H.; Ejeta, C. +1 more
Context. Measurements of the polarized reflected sunlight from atmosphereless solar system bodies, over a range of phase angles, provide information about the surface structure and composition.
Aims: With this work, we provide analysis of the polarimetric observations of the bright side of Iapetus at five different phase angles, and over the …
Recent Developments of NEMO: Detection of EUV Wave Characteristics
Podladchikova, O.; Van der Linden, R. A. M.; Vuets, A. +1 more
Recent developments in space instrumentation for solar observations and increased telemetry have necessitated the creation of advanced pattern recognition tools for different classes of solar events. The Extreme Ultraviolet Imaging Telescope (EIT) onboard the SOHO spacecraft has uncovered a new class of eruptive events on the solar disk, which are…
Radio Pulsating Structures with Coronal Loop Contraction
Pohjolainen, S.; Kallunki, J.
We present a multi-wavelength study of a solar eruption event on 20 July 2004, comprising observations in Hα, EUV, soft X-rays, and in radio waves with a wide frequency range. The analyzed data show both oscillatory patterns and shock wave signatures during the impulsive phase of the flare. At the same time, large-scale EUV loops located above the…
Implementation of Martian virtual reality environment using very high-resolution stereo topographic data
Kim, Jung-Rack; Lin, Shih-Yuan; Hong, Jeong-Woo +2 more
Topography over terrestrial or other planetary surfaces is an important base data for virtual reality construction. In particular, with inaccessible topography such as the Martian surface, virtual reality provides great value not only for public interaction but also for scientific research. For the latter application, since field surveys are essen…
Super-resolution in map-making based on a physical instrument model and regularized inversion. Application to SPIRE/Herschel
Abergel, A.; Rodet, T.; Orieux, F. +3 more
We investigate super-resolution methods for image reconstruction from data provided by a family of scanning instruments like the Herschel observatory. To do this, we constructed a model of the instrument that faithfully reflects the physical reality, accurately taking the acquisition process into account to explain the data in a reliable manner. T…
In-flight calibration of the spin axis offset of a fluxgate magnetometer with an electron drift instrument
Russell, C. T.; Torkar, K.; Leinweber, H. K.
We show that the spin axis offset of a fluxgate magnetometer can be calibrated with an electron drift instrument (EDI) and that the required input time interval is relatively short. For missions such as Cluster or the upcoming Magnetospheric Multiscale (MMS) mission the spin axis offset of a fluxgate magnetometer could be determined on an orbital …
A wide-field near-infrared H2 2.122 µm line survey of the Braid Nebula star formation region in Cygnus OB7
Smith, M. D.; Davis, C. J.; Beck, T. L. +8 more
Context. Outflows and jets are the first signposts of ongoing star formation processes in any molecular cloud, yet their study in optical bands provides limited results due to the large extinction present. Near-infrared unbiased wide-field observations in the H2 1-0 S(1) line at 2.122 µm alleviates the problem, enabling us to dete…
A new Herschel view of the young star T54: not a transitional disk?
Prusti, T.; Pilbratt, G. L.; Huélamo, N. +10 more
Context. Observations of transitional disks give us an understanding of the formation of planets and planetary systems such as our own. But care must be taken in identifying such sources: the higher spatial resolution of the Herschel Space Observatory provides a new view of the origin of the far-infrared and submillimeter excesses observed.
A…
The Arp 220 Merger on kpc Scales
Scharwächter, J.; König, S.; Eckart, A. +2 more
For the first time, we study the eastern nucleus in greater detail and search for the more extended emission in the molecular gas in different CO line transitions of the famous ultraluminous infrared galaxy (ULIRG) Arp 220. Furthermore, we present a model of the merger in Arp 220 on large scales with the help of the CO data and an optical and near…