Search Publications
Dynamical Parameters for AM 0644-741
Antunes, Alex; Wallin, John
We present a simulation match to the 2004 Hubble Heritage high-resolution optical images of AM 0644-741. In N-body/smoothed particle hydrodynamics (SPH) simulations of AM 0644-741, we recreate the star formation features, as well as the underlying kinematics. Our simulations contain sufficient numerical density to accurately distinguish the overla…
Nonlinear plasma wave processes observed in the polar cusp
Błęcki, Jan; Wronowski, Roman; Parrot, Michel +1 more
We present observations of electric and magnetic field variations from proton (about few Hz) to electron cyclotron frequencies (about few kHz) obtained by STAFF instrument on Cluster satellites during two cusp crossings, at ∼6 RE altitude, in September 2002. The cusp was identified by the presence of intensive fluxes of counter streamin…
Ice-rich terrain in Gusev Crater, Mars?
Gregg, Tracy K. P.; Briner, Jason P.; Paris, Kristen N.
The morphology of materials on the floor of Gusev Crater (14° S, 175° W), Mars, imply a history of volcanism and subsequent removal of an ice-rich deposit. Fluid lava flows observed in the western portion of Gusev Crater paradoxically terminate in a steep, thick ( <60 m) flow front adjacent to hummocky terrain. The hummocky terrain is morpholog…
RBS1423 - a new QSO with relativistic reflection from an ionised disk
Husemann, B.; Krumpe, M.; Lamer, G. +1 more
Aims:We present the analysis and results of a 20 ks XMM-Newton observation of RBS1423.
Methods: X-ray spectral analysis is used to establish a significantly broadened relativistic iron Kα line from a highly ionised disk.
Results: A QSO at z = 2.262 was considered to be the optical counterpart of this ROSAT Bright Survey X-ray source. Based…
Polar and Cluster observations of a dayside inverted-V during conjunction
Frahm, R. A.; Khotyaintsev, Y.; Menietti, J. D. +2 more
We investigate particle and fields data during a conjunction of the Polar and Cluster spacecraft. This conjunction occurs near the dayside cusp boundary layer when a dayside inverted-V was observed in the particle data of both satellites. Electron, ion, electric field, and magnetic field data from each satellite confirm that the dayside inverted-V…
The multi-wavelength study of the effect of energetic particle beams on the chromospheric emission in the 25th July 2004 solar flare
Zharkova, V. V.; Kashapova, L. K.; Chornogor, S. N. +1 more
We present the multi-wavelength study of short-term variations of Hα line emission located in multiple kernels on the both sides from magnetic neutral line in the 25th July 2004 solar flare observed by VTT (Tenerife). The HXR and Hα emission in the kernels 1 and 3 is close spatially and temporally while in kernels 4 and 7 there is only delayed Hα …
Gamma rays from cosmic radioactivities
Diehl, Roland; Hartmann, Dieter H.; Prantzos, Nikos
Gamma rays from radioactive byproducts of cosmic nucleosynthesis are direct messengers from nuclear processes taking place in various cosmic sites, and can be measured with telescopes operated in space. Due to low detector sensitivity, up until now, only a handful of sources have been detected in that electromagnetic window. Cobalt lines from SN19…
Observed flux density enhancement at submillimeter wavelengths during an X-class flare
Mandrini, C. H.; Giménez de Castro, C. G.; Cristiani, G. +4 more
We analyse the 30 October, 2004, X1.2/SF solar event that occurred in AR 10691 (N13 W18) at around 11:44 UT. Observations at 212 and 405 GHz of the Solar Submillimeter Telescope (SST), with high time resolution (5 ms), show an intense impulsive burst followed by a long-lasting thermal phase. EUV images from the Extreme Ultraviolet Imaging Telescop…
Hard X-ray emission from the SNR G337.2+0.1
Albacete Colombo, Juan F.; Benaglia, Paula; Combi, Jorge A. +1 more
We report hard X-ray emission of the non-thermal supernova remnant G337.2+0.1. The source presents centrally filled and diffuse X-ray emission. A spectral study confirms that the column density of the central part of the object is about NH∼5.9(±1.5)×1022 cm‑2 and its X-ray spectrum is well represented by a single p…
Chromospherically Active Stars. XXVI. The Double-Lined Late-Type Binary HD 19485 = WZ Arietis
Bolton, C. T.; Fekel, Francis C.
We have used spectroscopic observations to determine the orbital elements and some basic properties of the double-lined spectroscopic binary HD 19485 = WZ Ari. The orbital period is 6.247854 days, and the orbit is circular. The G5 V primary and K0 V secondary are chromospherically active. One star or possibly both are synchronously rotating. Based…