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870 µm continuum observations of the bubble-shaped nebula Gum 31
Rubio, M.; Firpo, V.; Cappa, C. E. +4 more
Aims: We present here a study of the cold dust in the close environs of the ring nebula Gum 31. We aim at deriving the physical properties of the molecular gas and dust associated with the nebula, and investigating its correlation with the star formation in the region, which was probably triggered by the expansion of the ionization front agai…
Numerical simulations of the global circulation of the atmosphere of Venus: Effects of surface relief and solar radiation heating
Rodin, A. V.; Mingalev, I. V.; Orlov, K. G.
The results of numerical simulations of the global circulation of the atmosphere of Venus in the framework of the complete set of gas dynamics equations, taking into account surface relief, are presented. To calculate the radiative heating/cooling of the atmosphere, the relaxation approximation is used. The heating parameters, at which the modeled…
Planetary science: Enceladus' hot springs
Tobie, Gabriel
The detection of silicon-rich particles originating from Saturn's moon Enceladus suggests that water-rock interactions are currently occurring inside it -- the first evidence of ongoing hydrothermal activity beyond Earth. See Letter p.207
X-Ray Spectral Properties of the Isolated AGNs: NGC 1050, NGC 2989, ESO 317-038, ESO 438-009
Vasylenko, A. A.; Babyk, Iu. V.; Vavilova, I. B. +1 more
We have analyzed the spectral data obtained by XMM-Newton, Swift, Chandra, and INTEGRAL space observatories for several isolated AGNs from 2MIG catalogue, for which the available X-ray data were accessed. Among these objects were CGCG 179-005, NGC 6300, NGC 1050, NGC 2989, WKK 3050, ESO 438-009, and ESO 317-038. We determined corresponding spectra…
Photospheric Flow Field Related to the Evolution of the Sun's Polar Magnetic Patches Observed by Hinode Solar Optical Telescope
Kubo, M.; Tsuneta, S.; Suematsu, Y. +3 more
We investigated the role of photospheric plasma motions in the formation and evolution of polar magnetic patches using time-sequence observations with high spatial resolution. The observations were obtained with the spectropolarimeter on board the Hinode satellite. From the statistical analysis using 75 magnetic patches, we found that they are sur…
A metal-rich elongated structure in the core of the group NGC 4325
Lovisari, L.; Schellenberger, G.; Laganá, T. F. +3 more
Aims: Based on XMM-Newton, Chandra, and optical DR10-SDSS data, we investigate the metal enrichment history of the group NGC 4325 (z = 0.026). To complete the analysis we used chemical evolution models and studied the optical spectrum of the central dominant galaxy through its stellar population analysis and emission line diagnostics to analy…
The Q/U Imaging Experiment: Polarization Measurements of Radio Sources at 43 and 95 GHz
Dickinson, C.; Eriksen, H. K.; Huffenberger, K. M. +24 more
We present polarization measurements of extragalactic radio sources observed during the cosmic microwave background polarization survey of the Q/U Imaging Experiment (QUIET), operating at 43 GHz (Q-band) and 95 GHz (W-band). We examine sources selected at 20 GHz from the public, >40 mJy catalog of the Australia Telescope (AT20G) survey. There a…
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…