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Very Long Baseline Array Observations of Parsec-scale Radio Emission in Dual Active Galactic Nuclei
Ho, Luis C.; Zhang, Ming; An, Tao +11 more
It is believed that dual active galactic nuclei (AGN) form during galaxy mergers. Studying dual-AGN emission can provide valuable insights into galaxy merging and evolution. To investigate parsec-scale radio emission properties, we observed eight radio components of four selected dual-AGN systems using the Very Long Baseline Array (VLBA) at 5 GHz …
Study of Plasma Heating Processes in a Coronal Mass Ejection–driven Shock Sheath Region Observed with the Metis Coronagraph
Susino, Roberto; Fineschi, Silvano; Stangalini, Marco +25 more
On 2021 September 28, a C1.6 class flare occurred in active region NOAA 12871, located approximately at 27°S and 51°W on the solar disk with respect to Earth's point of view. This event was followed by a partial halo coronal mass ejection (CME) that caused the deflection of preexisting coronal streamer structures, as observed in visible-light coro…
Fluorine Abundances in Local Stellar Populations
Grisoni, V.; Brady, K. E.; Pilachowski, C. A. +2 more
We present the first fluorine measurements in 12 normal K giants belonging to the Galactic thin and thick disks using spectra obtained with the Phoenix infrared spectrometer on the 2.1 m telescope at Kitt Peak. Abundances are determined from the (1‑0) R9 2.3358 µm feature of the molecule HF. Additionally, sodium abundances are derived in 25 …
How Solar Soft X-Ray Irradiance Is Affected by the Size of Field of View
Takeda, Aki; Boland, Shannon
Soft X-ray images of the Sun obtained with multiple broadband filters provide a simple and useful method to calculate averaged coronal temperature and emission measure, from which we can further calculate solar X-ray irradiance in physical units, e.g., watts per square meter. However, X-ray telescopes are often designed for pursuing high spatial r…
Extent of the Magnetotail of Venus From the Solar Orbiter, Parker Solar Probe and BepiColombo Flybys
Sorriso-Valvo, Luca; Edberg, Niklas J. T.; Persson, Moa +20 more
We analyze data from multiple flybys by the Solar Orbiter, BepiColombo, and Parker Solar Probe (PSP) missions to study the interaction between Venus' plasma environment and the solar wind forming the induced magnetosphere. Through examination of magnetic field and plasma density signatures we characterize the spatial extent and dynamics of Venus' …
Implications of Photon-Axion Oscillations on X-Ray Observations of the Coma Cluster
Pulatova, N.; Tugay, A.; Zadorozhna, L. +3 more
Axion-like particles (ALPs) emerge as predictions from various extensions of the Standard Model, standing out as plausible candidates for dark matter. Axions are thought to be produced when light passes through regions of magnetic fields. This positions astrophysical environments as prime sites for their production and subsequent detection. Howeve…
The Sun's Magnetic Power Spectra over Two Solar Cycles. II. Cycle Dependence of Active Regions, a Magnetic Network, and Their Relation
Wang, Ruihui; Jiang, Jie; Luo, Yukun
The multiscaled solar magnetic field consists of two major components: active regions (ARs) and magnetic network. Unraveling the cycle-dependent properties and interrelations of these components is crucial for understanding the evolution of the solar magnetic field. In this study, we investigate these components using magnetic power spectra derive…
Orbit of the Patroclus–Menoetius Binary System and Predictions for the 2024/2025 Mutual Events Season
Popescu, Marcel; Licandro, Javier; Berthier, Jérôme +5 more
We report on the ephemeris development for Menoetius, the satellite of Patroclus. Our data set consisted of ground–based and Hubble Space Telescope relative astrometry, as well as 42 lightcurves from the mutual events seasons in 2007, 2012, and 2017/2018. Our dynamical model included the effects of oblate, nonspherical shapes of the components, an…
Editorial: Circulation of heavy ions and their role in regulating the near-earth plasma dynamics
Chen, Lunjin; Kronberg, Elena; Bashir, M. Fraz
Observaciones fotométricas ópticas de candidatas a galaxias en el survey VVV
González, J. F.; Zarate, F.; Duplancic, F. +4 more
A sample of galaxy candidates observed in the south region of the galactic bulge of Vista Variables in the Via Láctea survey is presented in this work. With the use of the Double Astrograph from the Estación de Altura Carlos Ulrrico Cesco the magnitudes in the visible light of 35 galaxy candidates were obtained. This galaxy candidates were selecte…