Search Publications
An analysis of outgassing pressure forces on the Rosetta orbiter using realistic 3D+t coma simulations
Mysen, E.; Rodionov, A. V.; Crifo, J. -F.
A model for the interaction between a multicomponent Maxwellian atmosphere and a spacecraft is described. Multidimensional, time-dependent gasdynamical simulations of the gas coma around the recently reconstructed aspherical rotating nucleus of comet 67P/C-G is used to analyze the outgassing pressure forces on the ESA spacecraft Rosetta. The force…
Signatures of transition region explosive events in hydrogen Lyβ profiles
Chen, Y.; Tian, H.; Zhang, M. +1 more
Aims: We search for signatures of transition region explosive events (EEs) in hydrogen Lyβ profiles. The relationship between the peak emission of Lyβ profiles and the wing emission of C ii and O vi during EEs is investigated.
Methods: Two rasters made by the SUMER (Solar Ultraviolet Measurements of Emitted Radiation) instrument onboard …
Determining the morpho-kinematic properties of a face-on merger at z ~ 0.7
Yang, Y.; Flores, H.; Hammer, F. +4 more
Context. At intermediate redshifts, many galaxies seem to have experienced an interaction. It is not always straightforward to determine what type of encounter or perturbation is observed, nor the outcome of this event. In some cases, only the use of both morphological and kinematical information can determine the true configuration of an encounte…
The AKARI FU-HYU galaxy evolution program: first results from the GOODS-N field
Lee, H. M.; Negrello, M.; Serjeant, S. +7 more
The AKARI FU-HYU mission program carried out mid-infrared imaging of several well studied Spitzer fields preferentially selecting fields already rich in multi-wavelength data from radio to X-ray wavelengths filling in the wavelength desert between the Spitzer IRAC and MIPS bands. We present the initial results for the FU-HYU survey in the GOODS-N …
Heavy coronal ions in the heliosphere. I. Global distribution of charge-states of C, N, O, Mg, Si, and S
Bzowski, M.; Grzedzielski, S.; Wachowicz, M. E. +1 more
Aims: Our aim is to investigate and study the de-charging of the elements C, N, O, Mg, Si and S-ions, and assess the fluxes of the resulting ENA in the heliosphere.
Methods: The model treats the heavy ions as test particles convected by (and in a particular case also diffusing through) a hydrodynamically calculated background plasma flow…
Fitting of dust spectra with genetic algorithms. I. Perspectives and limitations
Lebzelter, T.; Kerschbaum, F.; Baier, A.
Aims: We present an automatised fitting procedure for the IR range of AGB star spectra. Furthermore we explore the possibilities and boundaries of this method.
Methods: We combine the radiative transfer code DUSTY with the genetic algorithm PIKAIA in order to improve an existing spectral fit significantly.
Results: In order to test …
The peculiar high-mass X-ray binary 1ES 1210-646
Palazzi, E.; Masetti, N.; Capitanio, F. +6 more
Using data collected with the BeppoSAX, INTEGRAL and Swift satellites, we report and discuss the results of a study on the X-ray emission properties of the X-ray source 1ES 1210-646, recently classified as a high-mass X-ray binary through optical spectroscopy. This is the first in-depth analysis of the X-ray spectral characteristics of this source…
Pre-flyby estimates of the precision of the mass determination of asteroid (21) Lutetia from Rosetta radio tracking
Pätzold, M.; Bird, M. K.; Asmar, S. W. +5 more
The Rosetta spacecraft will fly by its second target asteroid (21) Lutetia on 10 July 2010. Simulations based on the currently known size of Lutetia and assumptions on the bulk density show that tracking of two radio-carrier frequencies at X-band (8.4 GHz) and S-band (2.3 GHz) during the flyby will determine the mass at less than 1% accuracy. Deri…
Radiative and magnetic properties of solar active regions. II. Spatially resolved analysis of O V 62.97 nm transition region emission
Fludra, A.; Warren, H.
Context. Global relationships between the photospheric magnetic flux and the extreme ultraviolet emission integrated over active region area have been studied in a previous paper by Fludra & Ireland (2008, A&A, 483, 609). Spatially integrated EUV line intensities are tightly correlated with the total unsigned magnetic flux, and yet these g…
The catalog of variable sources detected by INTEGRAL. I. Catalog and techniques
Eckert, D.; Savchenko, V.; Produit, N. +3 more
Context. During its 6 years of operation, INTEGRAL/ISGRI has detected more than 500 sources. Many of these sources are variable. Taking into account that nearly half of INTEGRAL/ISGRI sources are new and many of them remain unidentified, the variability properties of the sources can provide additional constraints to help us to classify and identif…