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Explosive Events: Swirling Transition Region Jets
Curdt, W.; Tian, H.; Kamio, S.
In this paper, we extend our earlier work to provide additional evidence for an alternative scenario to explain the nature of events called `explosive events'. The bidirected, fast Doppler motion of explosive events observed spectroscopically in the transition region emission is classically interpreted as a pair of bidirectional jets moving upward…
Correction to “A statistical study of the propagation characteristics of whistler waves observed by Cluster”
Khotyaintsev, Yuri V.; Agapitov, Oleksiy; Krasnoselskikh, Vladimir +1 more
Abstract Available from http://www.agu.org
Accretion Geometry of the Low-Mass X-Ray Binary Aquila X-1 in the Soft and Hard States
Makishima, Kazuo; Nakazawa, Kazuhiro; Takahashi, Hiromitsu +4 more
The neutron-star Low-Mass X-ray Binary Aquila X-1 was observed seven times in total with the Suzaku X-ray observatory from September 28 to October 30 in 2007, in the decaying phase of an outburst. In order to constrain the flux-dependent accretion geometry of this source over wider energy bands than employed in most previous studies, the present s…
The ultracool dwarf DENIS-P J104814.7-395606. Chromospheres and coronae at the low-mass end of the main-sequence
Schmitt, J. H. M. M.; Leone, F.; Cupani, G. +8 more
Context. Several diagnostics ranging from the radio to the X-ray band are suitable for investigating the magnetic activity of late-type stars. Empirical connections between the emission at different wavelengths place constraints on the nature and efficiency of the emission mechanism and the physical conditions in different atmospheric layers. The …
Acceleration of radiation belts electrons by oblique chorus waves
Krasnoselskikh, V.; Agapitov, O.; Artemyev, A. +1 more
The redistribution of energy during the recovery phase of geomagnetic storms related to the acceleration of electrons in the Earth's outer radiation belt by cyclotron-resonant chorus waves is an important and challenging topic of magnetospheric plasma physics. An approximate analytical formulation of energy diffusion coefficients is derived in thi…
An Inverse Compton Scattering Origin of X-Ray Flares from Sgr A*
Genzel, R.; Heinke, C. O.; Grosso, N. +6 more
The X-ray and near-IR emission from Sgr A* is dominated by flaring, while a quiescent component dominates the emission at radio and submillimeter (sub-mm) wavelengths. The spectral energy distribution of the quiescent emission from Sgr A* peaks at sub-mm wavelengths and is modeled as synchrotron radiation from a thermal population of electrons in …
The Herschel Virgo Cluster Survey. XI. Environmental effects on molecular gas and dust in spiral disks
Ciesla, L.; Bianchi, S.; Fritz, J. +19 more
Aims: We investigate the dust-to-gas mass ratio and the environmental effects on the various components of the interstellar medium for a spatially resolved sample of Virgo spirals.
Methods: We have used the IRAM-30 m telescope to map over their full extent NGC 4189, NGC 4298, NGC 4388, and NGC 4299 in the 12CO(1-0) and the
Comparison between theory and observation of the frequency sweep rates of equatorial rising tone chorus
Li, W.; Tao, X.; Bortnik, J. +2 more
Theoretical predictions for chorus frequency sweep rates by Helliwell and Trakhtengerts are compared with observations from the THEMIS satellites and a previously published dataset from the Cluster satellites. We first extend the theories to use a general magnetic field model to include the effects of magnetic local time and geomagnetic activity, …
Herschel Search for O2 toward the Orion Bar
Li, Di; van Dishoeck, Ewine F.; Encrenaz, Pierre +15 more
We report the results of a search for molecular oxygen (O2) toward the Orion Bar, a prominent photodissociation region at the southern edge of the H II region created by the luminous Trapezium stars. We observed the spectral region around the frequency of the O2 NJ = 33-12 transition at 487 GH…
XMM-Newton View of Swift J1834.9-0846 and Its Magnetar Wind Nebula
Kouveliotou, C.; Pavlov, G. G.; Göǧüş, E. +3 more
We report on the analysis of two XMM-Newton observations of the recently discovered soft gamma repeater Swift J1834.9-0846, taken in 2005 September and one month after the source went into outburst on 2011 August 7. We performed timing and spectral analyses on the point source as well as on the extended emission. We find that the source period is …