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Supernovae Origin for the Low-latitude Intermediate-velocity Arch and the North Celestial Pole Loop
Jorissen, A.; Verschuur, G. L.; Schmelz, J. T. +1 more
Supernova explosions attributed to the unseen companion in several binary systems identified by the Third Gaia Data Release (Gaia DR3) may be responsible for a number of well-known and well-studied features in the radio sky, including the low-latitude intermediate-velocity (LLIV) arch and the north celestial pole (NCP) loop. Slices from the longit…
A Scattered Star Group in the Orion A Region of the Milky Way
Kovaleva, Dana; Sapozhnikov, Sergei; Vereshchagin, Sergei +4 more
Using Gaia DR3 data, we identified an extended a ~60 pc group of stars sharing common motion but scattered in space, including from 150 to 300 probable members, named Group V. It can be associated with a group identified by Getman et al. (2019) and by Jerabkova et al. (2019) as a relic of a gas filament, traced by the mutual position of stars afte…
Timescale of Stellar Feedback-driven Turbulence in the ISM: A Deep Dive into UGC 4305
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Cohen, Roger E. +3 more
Understanding the interplay of stellar feedback and turbulence in the interstellar medium (ISM) is essential to modeling the evolution of galaxies. To determine the timescales over which stellar feedback drives turbulence in the ISM, we performed a spatially resolved, multiwavelength study of the nearby star-forming dwarf galaxy UGC 4305. As indic…
New red giants in NGC 6791 and NGC 6819 using Kepler superstamps
Hekker, S.; Covelo-Paz, A.; Themeßl, N. +1 more
Context. Stars that are members of stellar clusters are assumed to be formed at the same time and place from material with the same initial chemical composition. These additional constraints on the ensemble of cluster stars make these stars suitable as benchmarks.
Aims: We aimed (1) to identify previously unknown red giants in the open cluste…
Solar radio bursts observations by Egypt- Alexandria CALLISTO spectrometer: First results
Kozarev, K.; Minta, F. N.; Nozawa, S. I. +2 more
The newly installed CALLISTO spectrometer, hosted by the Department of Space Environment, Institute of Basic and Applied Sciences- EJUST, commenced operation on August 14, 2021. The system contains a cross dipole long-wavelength array antenna with high sensitivity to monitor solar radio transients. Its antenna was strategically positioned and appe…
Discovery of an extended G giant chromosphere in the 2019 eclipse of γ Per
Schmitt, J. H. M. M.; Fridlund, M.; Schröder, K. -P. +3 more
The November 2019 eclipse of γ Per was a rare opportunity to seek evidence for a chromosphere of the G8 giant, hitherto suspected but not detected. Twenty-nine years after the only other observed eclipse, we aim to find chromospheric absorption in the strong Ca II H&K lines, and to determine its column densities and scale height. Using the Tel…
Search for DA White Dwarf Binary Candidates from LAMOST DR7
Zhao, Gang; Zhao, Jing-Kun; Wang, Liang +4 more
We obtained spectroscopy data for 761 Degenerate A (DA)white dwarfs (WDs) with multiple LAMOST observations. The radial velocity (RV) of each spectrum was calculated using the cross-correlation function method (CCF), and 60 DA WD binary candidates were selected based on the variation of the RV. Then, the atmosphere parameter Teff, logg, and the ma…
An Integrated Nonlinear Analysis (INA) Software for Space Plasma Turbulence
Echim, Marius; Munteanu, Costel; Kovács, Péter
We built an integrated nonlinear analysis software (INA)-designed to study space plasma turbulence and intermittency. The MATLAB programming environment was used for the algorithmic development and implementation of methods for spectral analysis, multiscale fluctuations and multifractal analysis. The performance of INA is demonstrated using magnet…
Jupiter's equatorial X-ray emissions over two solar cycles
Coates, A. J.; Branduardi-Raymont, G.; Dunn, W. R. +2 more
Jupiter's disc is bright in X-rays as H2 molecules in the atmosphere are very effective at scattering solar X-rays. K-shell fluorescence from carbon atoms in atmospheric methane is thought to also provide a minor contribution. XMM-Newton has now observed Jupiter over a span of nearly two solar cycles from 2003 to 2021, offering the oppo…
Flapping motion configurations of geomagnetotail current sheet
Dunlop, M.; Rong, Zhaojin; Shen, Chao +5 more
We explore the geometry of the flapping motion of geomagnetotail current sheet with the magnetic measurements of the Cluster (constellation) using a newly developed technique. The principal curvatures and directions of the surfaces of the flapping current sheet are successfully deduced by the normal field analysis (NFA). Results show that the dire…