Search Publications
Suzaku X-Ray Imaging of the Extended Lobe in the Giant Radio Galaxy NGC 6251 Associated with the Fermi-LAT Source 2FGL J1629.4+8236
Cheung, C. C.; Kataoka, J.; Stawarz, Ł. +7 more
We report the results of a Suzaku X-ray imaging study of NGC 6251, a nearby giant radio galaxy with intermediate FR I/II radio properties. Our pointing direction was centered on the γ-ray emission peak recently discovered with the Fermi Large Area Telescope (LAT) around the position of the northwest (NW) radio lobe 15 arcmin offset from the nucleu…
Multidimensional nonlinear mirror-mode structures in the Earth's magnetosheath
Omura, Yoshiharu; Shoji, Masafumi; Lee, Lou-Chuang
We performed two-dimensional (2D) and three-dimensional (3D) hybrid simulations in open boundary models to study the nonlinear mirror-mode structures driven by the temperature anisotropy (T⊥/T∥> 1) of protons in the magnetosheath. In the open systems, because of the propagation of EMIC waves, we obtain the clearer non-prop…
Observations of Plasma Upflow in a Warm Loop with Hinode/EIS
Del Zanna, Giulio; Tripathi, Durgesh; Mason, Helen E. +1 more
A complete understanding of Doppler shift in active region loops can help probe the basic physical mechanism involved into the heating of those loops. Here, we present observations of upflows in coronal loops detected in a range of temperatures (log T = 5.8-6.2). The loop was not discernible above these temperatures. The speed of upflow was strong…
A detailed X-ray investigation of ζ Puppis. I. The dataset and some preliminary results
Nazé, Y.; Rauw, G.; Flores, C. A.
Aims: One of the closest and brightest massive stars, ζ Puppis, was the first early-type object observed by the current generation of X-ray observatories. These observations provided some surprising results, partly confirming the theoretical predictions while simultaneously unveiling some problematic mismatches with expectations. In this seri…
Interstellar Silicate Dust in the z = 0.89 Absorber toward PKS 1830-211: Crystalline Silicates at High Redshift?
York, Donald G.; Kulkarni, Varsha P.; Welty, Daniel E. +3 more
We present evidence of a >10σ detection of the 10 µm silicate dust absorption feature in the spectrum of the gravitationally lensed quasar PKS 1830-211, produced by a foreground absorption system at redshift 0.886. We have examined more than 100 optical depth templates, derived from both observations of Galactic and extragalactic sources …
Dayside thermal structure of Venus' upper atmosphere characterized by a global model
Brecht, A. S.; Bougher, S. W.
Observations of Venus' dayside thermal structure are being conducted through ground based observatories. These temperature measurements, along with those from several instruments onboard the current Venus Express mission, are augmenting the previous thermal structure data from past missions (e.g., Veneras', Pioneer Venus Orbiter, Pioneer Venus Pro…
Iron mineralogy of the surface of Mars from the 1 µm band spectral properties
Bibring, J. -P.; Poulet, F.; Bellucci, G. +3 more
We study the 1 µm absorption from OMEGA/MEX spectra to map Martian iron mineralogy at a global scale. This band is covered on the left by the VNIR (visible and near infrared) OMEGA channel and on the right by the SWIR (short wavelengths infrared) one. We first perform a systematic spatial coregistration of the two channels after an improveme…
Upper ionosphere of Mars is not axially symmetrical
Gurnett, D. A.; Barabash, S.; Lundin, R. +6 more
The measurements carried out by the ASPERA-3 and MARSIS experiments on board the Mars Express (MEX) spacecraft show that the upper Martian ionosphere (h ≥ 400 km) is strongly azimuthally asymmetrical. There are several factors, e.g., the crustal magnetization on Mars and the orientation of the interplanetary magnetic field (IMF) which c…
HST/STIS spectroscopy of the magnetic Of?p star HD 108: the low state at ultraviolet wavelengths
Bouret, J. -C.; Howarth, I. D.; Hillier, D. J. +6 more
We present the first ultraviolet spectrum of the peculiar, magnetic Of?p star HD 108 obtained in its spectroscopic low state. The new data, obtained with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, reveal significant changes compared to IUE spectra obtained in the high state: N Vλ1240, Si IVλ1400 and C IVλ1550 pr…
Asymmetric magnetosphere deformation driven by hot flow anomaly(ies)
Němeček, Z.; Šafránková, J.; Přech, L. +2 more
We present a case study of a large deformation of the magnetopause on November 26, 2008. The investigation is based on observations of five THEMIS spacecraft located at the dawn flank in the magnetosphere and magnetosheath, on Cluster measurements at the dusk magnetosheath, and is supported by ACE solar wind monitoring. The main revelation of our …