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Lord of the Rings - Return of the King: Swift-XRT observations of dust scattering rings around V404 Cygni
Altamirano, D.; Motta, S. E.; Sivakoff, G. R. +5 more
On 2015 June 15, the black hole X-ray binary V404 Cygni went into outburst, exhibiting extreme X-ray variability which culminated in a final flare on June 26. Over the following days, the Swift-X-ray Telescope detected a series of bright rings, comprising five main components that expanded and faded with time, caused by X-rays scattered from the o…
Stability within Jupiter's polar auroral 'Swirl region' over moderate timescales
Clarke, John T.; O'Donoghue, James; Connerney, John E. P. +7 more
Jupiter's Swirl region, poleward of the main auroral emission, has been characterised in previous observations as having highly variable auroral emission, changing dramatically across the region on a two-minute timescale, the typical integration time for UV images. This variability has made comparisons with H3+ emission diffi…
Suzaku and XMM-Newton observations of the North Polar Spur: Charge exchange or ISM absorption?
Gu, Liyi; Kaastra, Jelle; Mao, Junjie +1 more
By revisiting the Suzaku and XMM-Newton data of the North Polar Spur, we discovered that the spectra are inconsistent with the traditional model consisting of pure thermal emission and neutral absorption. The most prominent discrepancies are the enhanced O vii and Ne ix forbidden-to-resonance ratios, and a high O viii Lyβ line relative to other Ly…
Flux rope proxies and fan-spine structures in active region NOAA 11897
Zhang, J.; Hou, Y. J.; Li, T.
Context. Flux ropes are composed of twisted magnetic fields and are closely connected with coronal mass ejections. The fan-spine magnetic topology is another type of complex magnetic fields. It has been reported by several authors, and is believed to be associated with null-point-type magnetic reconnection.
Aims: We try to determine the numbe…
Radiative seesaw model with degenerate Majorana dark matter
Okada, Hiroshi; Nomura, Takaaki; Orikasa, Yuta
We study a three-loop-induced neutrino mass model with exotic vectorlike isospin doublet leptons which contain a dark matter candidate. Then we explore lepton flavor violations and dark matter physics in a coannihilation system. In this paper, the nearly degenerate Majorana fermion dark matter can naturally be achieved at the two-loop level, while…
Treatment of non-sparse cratering in planetary surface dating
Michael, G. G.; Kneissl, T.; Schmedemann, N.
We here propose a new technique to derive crater size-frequency distributions (CSFDs) from non-sparsely cratered surfaces, by accounting for the loss of craters due to subsequent crater/ejecta coverage. This approach, which we refer to as the buffered non-sparseness correction (BNSC), relates each crater to a measurement area found by excluding re…
Spatially Resolved Spectroscopy of a Balmer-dominated Shock in the Cygnus Loop: An Extremely Thin Cosmic-Ray Precursor?
Katsuda, Satoru; Lee, Jae-Joon; Raymond, John C. +9 more
We present high-resolution long-slit spectroscopy of a Balmer-dominated shock in the northeastern limb of the Cygnus Loop with the Subaru high dispersion spectrograph. By setting the slit angle along the shock normal, we investigate variations of the flux and profile of the Hα line from preshock to postshock regions with a spatial resolution of ∼4…
One year in the Earth's magnetosphere: A global MHD simulation and spacecraft measurements
Kallio, E.; Palin, L.; Facskó, G. +6 more
The response of the Earth's magnetosphere to changing solar wind conditions is studied with a 3-D Magnetohydrodynamic (MHD) model. One full year (155 Cluster orbits) of the Earth's magnetosphere is simulated using Grand Unified Magnetosphere Ionosphere Coupling simulation (GUMICS-4) magnetohydrodynamic code. Real solar wind measurements are given …
Enhanced erosion rates on Mars during Amazonian glaciation
Head, James W.; Fassett, Caleb I.; Levy, Joseph S.
Observations of Mars from the surface and from orbit suggest that erosion rates over the last ∼3 Gyr (the Amazonian) have been as slow as 10-5 m/Myr and have been dominated by aeolian processes, while ancient (Noachian) erosion rates may have been orders of magnitude higher due to impact bombardment and fluvial activity. Amazonian-aged …
Sub-kpc star formation law in the local luminous infrared galaxy IC 4687 as seen by ALMA
Colina, L.; Villar-Martín, M.; Planesas, P. +8 more
We analyze the spatially resolved (250 pc scales) and integrated star formation (SF) law in the local luminous infrared galaxy (LIRG) IC 4687. This is one of the first studies of the SF law on a starburst LIRG at these small spatial scales. We combined new interferometric ALMA CO(2-1) data with existing HST/NICMOS Paα narrowband imaging and VLT/SI…