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Saturn's dayside ultraviolet auroras: Evidence for morphological dependence on the direction of the upstream interplanetary magnetic field
Lewis, G. R.; Dougherty, M. K.; Alexeev, I. I. +6 more
We examine a unique data set from seven Hubble Space Telescope (HST) "visits" that imaged Saturn's northern dayside ultraviolet emissions exhibiting usual circumpolar "auroral oval" morphologies, during which Cassini measured the interplanetary magnetic field (IMF) upstream of Saturn's bow shock over intervals of several hours. The auroras general…
High-energy X-Ray Detection of G359.89-0.08 (Sgr A-E): Magnetic Flux Tube Emission Powered by Cosmic Rays?
Hailey, Charles J.; Mori, Kaya; Bauer, Franz E. +11 more
We report the first detection of high-energy X-ray (E > 10 keV) emission from the Galactic center non-thermal filament G359.89-0.08 (Sgr A-E) using data acquired with the Nuclear Spectroscopic Telescope Array (NuSTAR). The bright filament was detected up to ~50 keV during a NuSTAR Galactic center monitoring campaign. The featureless power-law s…
Broad absorption line variability in radio-loud quasars
Brandt, W. N.; Welling, C. A.; Miller, B. P. +2 more
We investigate C IV broad absorption line (BAL) variability within a sample of 46 radio-loud quasars (RLQs), selected from Sloan Digital Sky Survey (SDSS)/Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) data to include both core-dominated (39) and lobe-dominated (7) objects. The sample consists primarily of high-ionization BAL quasars,…
Konus- Wind and Helicon- Coronas-F observations of solar flares
Frederiks, D. D.; Svinkin, D. S.; Aptekar, R. L. +7 more
Results of solar flare observations obtained in the Konus-Wind experiment from November, 1994 to December, 2013 and in the Helicon Coronas-F experiment during its operation from 2001 to 2005, are presented. For the periods indicated Konus-Wind detected in the trigger mode 834 solar flares, and Helicon-Coronas-F detected more than 300 solar flares.…
The Centaur 10199 Chariklo: investigation into rotational period, absolute magnitude, and cometary activity
Fornasier, S.; Snodgrass, C.; Alvarez-Candal, A. +6 more
Context. Rings have recently been discovered around the Centaur 10199 Chariklo.
Aims: In this paper we present new photometric data, obtained at the 4.2 m SOAR Telescope, aiming to investigate Chariklo's absolute magnitude and rotational period, which is still unknown, and to look for potential cometary activity.
Methods: The field backg…
Eyes in the sky. Interactions between asymptotic giant branch star winds and the interstellar magnetic field
Decin, L.; Cox, N. L. J.; van Marle, A. J.
Context. The extended circumstellar envelopes (CSEs) of evolved low-mass stars display a large variety of morphologies. Understanding the various mechanisms that give rise to these extended structures is important to trace their mass-loss history.
Aims: Here, we aim to examine the role of the interstellar magnetic field in shaping the extende…
Topological inflation from the Starobinsky model in supergravity
Yokoyama, Jun'ichi; Kamada, Kohei
We consider the ghost-free higher-order corrections to the Starobinsky model in the old-minimal supergravity, focusing on a sector among several scalar fields in the model that reproduces the scalaron potential in the original Starobinsky model. In general, higher-order corrections cannot be forbidden by symmetries, which likely violate the flatne…
Spacecraft exploration of Phobos and Deimos
Hoffmann, Harald; Duxbury, Thomas C.; Zakharov, Alexander V. +1 more
We review the previous exploration of Phobos and Deimos by spacecraft. The first close-up images of Phobos and Deimos were obtained by the Mariner 9 spacecraft in 1971, followed by much image data from the two Viking orbiters at the end of the 70s, which formed the basis for early Phobos and Deimos shape and dynamic models. The Soviet Phobos 2 spa…
An active state of the BL Lacertae object Markarian 421 detected by INTEGRAL in April 2013
Maraschi, L.; Pian, E.; Villata, M. +22 more
Aims: Multiwavelength variability of blazars offers indirect, but very effective, insight into their powerful engines and on the mechanisms through which energy is propagated from the centre down the jet. The BL Lac object Mkn 421 is a TeV emitter, a bright blazar at all wavelengths, and therefore an excellent target for variability studies. …
Electron density inside Enceladus plume inferred from plasma oscillations excited by dust impacts
Gurnett, D. A.; Kurth, W. S.; Wahlund, J. -E. +4 more
Enceladus' southern plume is one of the major discoveries of the Cassini mission. The water neutrals and water ice particles (dust) ejected by the cryovolcanic activity populate Saturn's E ring and the neutral torus, and they interact with the plasma environment of Saturn's magnetosphere. The plasma neutrality inside Enceladus' plume has been show…