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Poleward Moving Auroral Arcs and Pc5 Oscillations
Sato, N.; Tanaka, Y.; Ebihara, Y. +6 more
We present an example of one-to-one correspondence between poleward moving auroral arcs (PMAAs) and Pc5 oscillations observed at the Time History of Events and Macroscale Interactions during Substorms (THEMIS) Ground Based Observatory station Gillam. The PMAAs consisted of four successive intensifications (named PMAA1, PMAA2, PMAA3 and PMAA4) with…
Characterizing the bulk and turbulent gas motions in galaxy clusters
Pointecouteau, Etienne; Eckert, Dominique; Dupourqué, Simon +1 more
The most massive halos of matter in the Universe grow via accretion and merger events throughout cosmic times. These violent processes generate shocks at many scales and induce large-scale bulk and turbulent motions. These processes inject kinetic energy at large scales, which is transported to the viscous dissipation scales, contributing to the o…
Editor's note: A high-energy view of exoplanets and their environments
Schartel, Norbert
Multi-star System Observations Based on the Direct-imaging Method
Zhao, Gang; Chen, Yi-li; Zhu, Yong-tian +1 more
The direct-imaging exploration can obtain comprehensive physical information of exoplanets, which is a key technology to search for extraterrestrial life in the future. In this paper, based on our recent high-contrast imaging data of ground-based telescope, the newly discovered multi-star candidates are presented. In the early stage, combined with…
A study of the Galactic HI supershell GS 121-05-037
Molina Lera, J. A.; Cichowolski, S.; Suad, L. A.
GS 121-05-037 is a Galactic supershell located in the outer part of the Galaxy at (l, b) ∼ (121.°3, - 4.°8) at a distance of 3.2 ± 1 kpc from the Sun. In this work we estimated the kinetic energy of the feature to determine its possible origin. Several catalogued H II regions are located projected towards the supershell. With the aim of determinin…
Gaia releases new Milky Way maps
Banks, Michael
The third data release from the European Space Agency's Gaia mission is one of the richest sets of published astronomical information, as Michael Banks finds out.
Human-Robotic Cooperative Space Exploration
Martin, Anne-Sophie
Since the beginning of space exploration, outer space has fascinated, captivated and intrigued people's mind. The launch of the first artificial satellite—Sputnik—in 1957 by the Soviet Union, and the first man on the Moon in 1969 represent two significant missions in the space exploration history. In 1972, Apollo 17 marked the last human program o…
A search for thermal X-ray emission from the composite supernova remnant G21.5-0.9 with Suzaku
Raycheva, Nergis C.; Sezer, Aytap
G21.5-0.9 is a young plerionic composite supernova remnant (SNR) hosting a bright pulsar wind nebula. The previous X-ray studies reported that the X-ray spectrum of the entire SNR can be fitted with a non-thermal spectral model, while the recent Chandra studies have pointed out that its X-ray spectrum also shows weak thermal emission. With this mo…
Speckle Observations with PISCO in Calern (France): Orbit and Mass Determinations for 22 Visual Binaries
Bendjoya, P.; Rivet, J. -P.; Ling, J. F. +7 more
This paper presents orbits and masses for 22 visual double stars, partly derived using their last observations made with the speckle camera PISCO. For 13 of them we have determined their first-time orbits. Masses were calculated from Hipparcos and Gaia parallaxes when available, and from dynamical parallaxes otherwise. They are compared with masse…
KIC 10417986: Spectroscopic Confirmation of the Nature of the Binary System with a δ Scuti Component
Esamdin, Ali; Fu, Jian-Ning; Yang, Tao-Zhi +9 more
KIC 10417986 is a short orbital period (0.0737 day) ellipsoidal variable star with a δ Sct and γ Dor hybrid pulsation component discovered by Kepler. The ground-based spectroscopic observations were carried out in the winters of 2020 and 2021 to investigate the binary nature of this star. We derive the orbital parameters using the rvfit code with …