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Observational Evidence for the Causes and Consequences of Chromospheric Reconnection
He, Jiansen; Xia, Lidong; Jiao, Fangran +1 more
The chromospheric anemone jets with an inverse “Y” shape are ubiquitous, as revealed by the Solar Optical Telescope observations. These jets are considered to be consequences of chromospheric magnetic reconnections. Although these jets have been studied intensively, the dynamics and their driving causes remain unclear observationally. In this work…
An Analytical Model of Interplanetary Coronal Mass Ejection Interactions
Lara, A.; Cantó, J.; González, R. F. +1 more
We present an analytical model that describes the evolution of two consecutive interplanetary coronal mass ejections (ICMEs), their interaction, and the evolution of the merged region. In this model, the coronal mass ejections (CMEs) are seen as velocity and density (mass loss rate) fluctuations of the solar wind that result in the formation of sh…
Formation of self-organized shear structures in thin current sheets
Malova, H. V.; Popov, V. Yu.; Delcourt, D. C. +8 more
Self-consistent kinetic (particle-in-cell) model of magnetotail thin current sheet (TCS) is used to understand the formation of self-consistent sheared magnetic structures. It is shown that shear configurations appear in TCS as a result of self-consistent evolution of some initial magnetic perturbation at the current sheet center. Two general shap…
Suzaku Observations of Subhalos in the Coma Cluster
Sato, Kosuke; Okabe, Nobuhiro; Matsushita, Kyoko +1 more
We observed three massive subhalos in the Coma cluster with Suzaku. These subhalos, labeled “ID 1,” “ID 2,” and “ID 32,” were detected with a weak-lensing survey using Subaru/Suprime-Cam, and are located at the projected distances of 1.4 r500, 1.2 r500, and 1.6 r500 from the center of the Coma cluster, respectively…
The capabilities of ROSINA/DFMS to measure argon isotopes at comet 67P/Churyumov-Gerasimenko
Altwegg, K.; Berthelier, J. J.; Fuselier, S. A. +8 more
Little is known about the noble gas abundances in comets. These highly volatile atoms are possible tracers of the history of cometary matter including the thermal evolution. They can help quantify the contribution of cometary impacts to terrestrial oceans and help elucidate on the formation history of comets and their role in the formation and evo…
Constraints on the evolutionary mechanisms of massive galaxies since z ∼ 1 from their velocity dispersions
Pérez-González, P. G.; Falcón-Barroso, J.; Guzmán, R. +9 more
Several authors have reported that the dynamical masses of massive compact galaxies (M* ≳ 1011 M⊙, re ∼ 1 kpc), computed as Mdyn = 5.0 σe2 re/G, are lower than their stellar masses M*. In a previous study from our group, the discrepancy is interprete…
Pluto and Charon's UV spectra from IUE to New Horizons
Stern, S. Alan; Schindhelm, Rebecca; Gladstone, Randy +1 more
We compare Mid-Ultraviolet (MUV) spectra of Pluto taken over a period of 20 years by the International Ultraviolet Explorer, the HST-Faint Object Spectrograph, and the HST-Cosmic Origins Spectrograph. We extract Pluto-only spectra from the IUE data and associate them with corrected longitudes when necessary. Comparing them with HST spectra provide…
The Importance of Long-Term Synoptic Observations and Data Sets for Solar Physics and Helioseismology
Gosain, Sanjay; Broomhall, Anne-Marie; Elsworth, Yvonne +3 more
A casual single glance at the Sun would not lead an observer to conclude that it varies. The discovery of the 11-year sunspot cycle was only made possible through systematic daily observations of the Sun over 150 years and even today historic sunspot drawings are used to study the behavior of past solar cycles. The origin of solar activity is stil…
Deep X-ray spectroscopy and imaging of the Seyfert 2 galaxy, ESO 138-G001
Bianchi, S.; Vignali, C.; Piconcelli, E. +4 more
We present a spectral and imaging analysis of the XMM-Newton and Chandra observations of the Seyfert 2 galaxy ESO138-G001, with the aim of characterizing the circumnuclear material responsible for the soft (0.3-2.0 keV) and hard (5-10 keV) X-ray emission. We confirm that the source is absorbed by Compton-thick gas. However, if a self-consistent mo…
A spectroscopically confirmed z = 1.327 galaxy-scale deflector magnifying a z ∼ 8 Lyman-break galaxy in the Brightest of Reionizing Galaxies survey
Treu, T.; Trenti, M.; Oesch, P. A. +6 more
We present a detailed analysis of an individual case of gravitational lensing of a z ∼ 8 Lyman-break galaxy (LBG) in a blank field, identified in Hubble Space Telescope imaging obtained as part of the Brightest of Reionizing Galaxies survey. To investigate the close proximity of the bright (mAB = 25.8) Y098-dropout to a small…