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Evidence of merging in the Seyfert galaxy NGC 3393, revealed by modelling the spectra
Contini, M.
The discovery (Fabbiano et al. 2001) of two active black holes in the Seyfert galaxy NGC 3393, which are separated by about 490 light years, has revealed a merging event. This has led us to look for other evidence of galaxy collision and merging, using an analysis of the observed spectra in different frequency ranges. In the narrow-line region (NL…
Location of the magnetodisk in the nightside outer magnetosphere of Saturn near equinox based on ion densities
Thomsen, M.; Szego, K.; Bebesi, Z. +4 more
We investigate ion densities derived from measurements by the Cassini Plasma Spectrometer, to determine how these ions are distributed around the magnetodisk of Saturn. The magnetodisk is a variable plasma structure, here we fitted the simple structural model of Arridge et al. (2011) as a reference for the location of the central line of the magne…
Solar Energetic Particle Events and the Kiplinger Effect
Kahler, S. W.
The Kiplinger effect is an observed association of solar energetic (E > 10 MeV) particle (SEP) events with a "soft-hard-harder" (SHH) spectral evolution during the extended phases of the associated solar hard (E > 30 keV) X-ray (HXR) flares. Besides its possible use as a space weather predictor of SEP events, the Kiplinger effect has been in…
Detection of an exoplanet around the evolved K giant HD 66141
Lee, B. -C.; Park, M. -G.; Han, I. +2 more
Aims: We have been carrying out a precise radial velocity (RV) survey for K giants to search for and study the origin of the low-amplitude and long-periodic RV variations.
Methods: We present high-resolution RV measurements of the K2 giant HD 66141 from December 2003 to January 2011 using the fiber-fed Bohyunsan Observatory Echelle Spect…
Preliminary results on γ Dor and δ Sct-γ Dor hybrid s in the CoRoT exo-field of LRa01
Hareter, M.
The 131 days long, high-precision light curves observed in the CoRoT exo-field during LRa01 were investigated for γ Dor and δ Sct-γ Dor hybrid stars. In total 418 γ Dor and 274 δ Sct-γ Dor hybrid candidates were identified. For a fraction of these candidates spectra are available obtained at the Anglo-Australian Observatory. Effective temperatures…
Is FS Tau B Driving an Asymmetric Jet?
Ohashi, Nagayoshi; Pyo, Tae-Soo; Liu, Chun-Fan +6 more
FS Tau B is one of the few T Tauri stars that possess a jet and a counterjet as well as an optically visible cavity wall. We obtained images and spectra of its jet-cavity system in the near-infrared H and K bands using the Subaru/Infrared Camera and Spectrograph and detected the jet and the counterjet in the [Fe II] 1.644 µm line for the fir…
The reflectivity spectrum and opposition effect of Titan's surface observed by Huygens' DISR spectrometers
Karkoschka, Erich; Schröder, Stefan E.; Tomasko, Martin G. +1 more
We determined Titan's reflectivity spectrum near the Huygens' landing site from observations taken with the Descent Imager/Spectral Radiometer below 500 m altitude, in particular the downward-looking photometer and spectrometers. We distinguish signal coming from illumination by sunlight and the lamp onboard Huygens based on their different spectr…
Inverse Compton X-Ray Halos around High-z Radio Galaxies: A Feedback Mechanism Powered by Far-infrared Starbursts or the Cosmic Microwave Background?
Lehmer, B. D.; Smail, Ian; Alexander, D. M. +1 more
We report the detection of extended X-ray emission around two powerful radio galaxies at z ~ 3.6 (4C 03.24 and 4C 19.71) and use these to investigate the origin of extended, inverse Compton (IC) powered X-ray halos at high redshifts. The halos have X-ray luminosities of L X ~ 3 × 1044 erg s-1 and sizes of ~60 kpc. …
Electron cross talk and asymmetric electron distributions near the Earth's bowshock
Schwartz, S. J.; Auster, U.; Mitchell, J. J.
Electron distributions in the magnetosheath display a number of far from equilibrium features. It has been suggested that one factor influencing these distributions may be the large distances separating locations at which electrons with different energies and pitch angles must cross the bowshock in order to reach a given point in the magnetosheath…
Structural asymmetry in martian impact craters as an indicator for an impact trajectory
Kenkmann, T.; Wulf, G.; Poelchau, M. H.
Impact crater formation is a highly dynamic and complex geological phenomenon. Methods of structural geology are capable of giving insights into deformation processes that occur during cratering. While most deformation observed in craters exhibits a generally radial symmetry, recent discoveries of non-radial structural elements in the central upli…