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The Three-part Structure of a Filament-unrelated Solar Coronal Mass Ejection
Chen, Y.; Li, B.; Song, H. Q. +6 more
Coronal mass ejections (CMEs) often exhibit the typical three-part structure in the corona when observed with white-light coronagraphs, I.e., the bright leading front, dark cavity, and bright core, corresponding to a high-low-high density sequence. As CMEs result from eruptions of magnetic flux ropes (MFRs), which can possess either lower (e.g., c…
A multiwavelength investigation of candidate millisecond pulsars in unassociated γ-ray sources
Greiner, J.; Belfiore, A.; Marelli, M. +7 more
About one-third of the 3033 γ-ray sources in the Third Fermi-LAT Gamma-ray Source Catalogue (3FGL) are unidentified and do not have even a tentative association with a known object; hence, they are defined as unassociated. Among Galactic γ-ray sources, pulsars represent the largest class, with over 200 identifications to date. About one-third of t…
NGC 741—Mergers and AGN Feedback on a Galaxy-group Scale
Giacintucci, S.; O'Sullivan, E.; David, L. +5 more
Low-mass galaxy cluster systems and groups will play an essential role in upcoming cosmological studies, such as those to be carried out with eROSITA. Though the effects of active galactic nuclei (AGNs) and merging processes are of special importance to quantify biases like selection effects or deviations from hydrostatic equilibrium, they are poo…
A Nonthermal Radio Filament Connected to the Galactic Black Hole?
Morris, Mark R.; Goss, W. M.; Zhao, Jun-Hui
Using the Very Large Array, we have investigated a nonthermal radio filament (NTF) recently found very near the Galactic black hole and its radio counterpart, Sgr A*. While this NTF—the Sgr A West Filament (SgrAWF)—shares many characteristics with the population of NTFs occupying the central few hundred parsecs of the Galaxy, the SgrAWF has the di…
Three-dimensional turbulence-resolving modeling of the Venusian cloud layer and induced gravity waves
Lebonnois, Sébastien; Spiga, Aymeric; Lefèvre, Maxence
The impact of the cloud convective layer of the atmosphere of Venus on the global circulation remains unclear. The recent observations of gravity waves at the top of the cloud by the Venus Express mission provided some answers. These waves are not resolved at the scale of global circulation models (GCM); therefore, we developed an unprecedented 3-…
MOCCA-SURVEY Database I: Is NGC 6535 a dark star cluster harbouring an IMBH?
Kamann, Sebastian; Bianchini, Paolo; Askar, Abbas +3 more
We describe the dynamical evolution of a unique type of dark star cluster model in which the majority of the cluster mass at Hubble time is dominated by an intermediate-mass black hole (IMBH). We analysed results from about 2000 star cluster models (Survey Database I) simulated using the Monte Carlo code MOnte Carlo Cluster simulAtor and identifie…
Geology and mineralogy of the Auki Crater, Tyrrhena Terra, Mars: A possible post impact-induced hydrothermal system
Bellucci, G.; Carrozzo, F. G.; Altieri, F. +2 more
A variety of hydrothermal environments have been documented in terrestrial impact structures. Due to both past water interactions and meteoritic bombardment on the surface of Mars, several authors have predicted various scenarios that include the formation of hydrothermal systems. Geological and mineralogical evidence of past hydrothermal activity…
Using the Coronal Evolution to Successfully Forward Model CMEs' In Situ Magnetic Profiles
Gopalswamy, N.; Kay, C.
Predicting the effects of a coronal mass ejection (CME) impact requires knowing if impact will occur, which part of the CME impacts, and its magnetic properties. We explore the relation between CME deflections and rotations, which change the position and orientation of a CME, and the resulting magnetic profiles at 1 AU. For 45 STEREO-era, Earth-im…
Reconnection-driven Magnetohydrodynamic Turbulence in a Simulated Coronal-hole Jet
DeVore, C. Richard; Karpen, Judith T.; Uritsky, Vadim M. +1 more
Extreme-ultraviolet and X-ray jets occur frequently in magnetically open coronal holes on the Sun, especially at high solar latitudes. Some of these jets are observed by white-light coronagraphs as they propagate through the outer corona toward the inner heliosphere, and it has been proposed that they give rise to microstreams and torsional Alfvén…
First observations of W Virginis stars with K2: detection of period doubling
Smolec, R.; Szabados, L.; Pál, A. +5 more
We present the first analysis of W Vir stars observed by the Kepler space telescope in the K2 mission. Clear cycle-to-cycle variations were detected in the light curves of KT Sco and the globular cluster member M80-V1. While the variations in the former star seem to be irregular on the short time-scale of the K2 data, the latter appears to experie…