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Resolution Enhancement of SOHO/MDI Magnetograms
Qin, Ying; Yu, Xiao-Guang; Ji, Kai-Fan +1 more
Research on the solar magnetic field and its effects on solar dynamo mechanisms and space weather events has benefited from the continual improvements in instrument resolution and measurement frequency. The augmentation and assimilation of historical observational data timelines also play a significant role in understanding the patterns of solar m…
Estimating the Total Energy Content in Escaping Accelerated Solar Electron Beams
Reid, Hamish A. S.; James, Alexander W.
Quantifying the energy content of accelerated electron beams during solar eruptive events is a key outstanding objective that must be constrained to refine particle acceleration models and understand the electron component of space weather. Previous estimations have used in situ measurements near the Earth, and consequently suffer from electron-be…
Population of excited levels of Fe+, Ni+, and Cr+ in exocomets' gaseous tails
Lecavelier des Etangs, A.; Vrignaud, T.
The star β Pictoris is widely known for harbouring a large population of exocomets, which create variable absorption signatures in the stellar spectrum as they transit the star. Although the physical and chemical properties of these objects have long been elusive, the recently developed exocomet curve of growth technique has, for the first time, e…
Mapping dust in the giant molecular cloud Orion A
Magorrian, John; Gration, Amery
The Sun is located close to the Galactic mid-plane, meaning that we observe the Galaxy through significant quantities of dust. Moreover, the vast majority of the Galaxy's stars also lie in the disc, meaning that dust has an enormous impact on the massive astrometric, photometric and spectroscopic surveys of the Galaxy that are currently underway. …
A Serendipitous Observation of the Recently Discovered Cataclysmic Variable TUVO-21acq
Kuntz, K. D.; Pfeifle, Ryan W.; Weaver, Kimberly A. +2 more
The recently discovered non-magnetic cataclysmic variable TUVO-21acq was serendipitously observed in a quiescent state during an XMM-Newton observing campaign for the starburst galaxy NGC 4945. Data from this campaign was combined with archival serendipitous XMM observations to examine its X-ray and UV/optical characteristics. TUVO-21acq was found…
Discovering changing-look AGN in the 6dF Galaxy Survey using ATLAS light curves
Wolf, Christian; Lai, Samuel; Tonry, John L. +4 more
Changing-look active galactic nuclei (CLAGNs) are characterized by extreme variations in line emission over short time-scales, mostly affecting broad H
Measurements of visual double stars with PISCO2 at the Nice 76-cm refractor in 2016-2017
Piccotti, Luca; Rivet, Jean-Pierre; Vakili, Farrokh +11 more
We present relative astrometric and photometric measurements of visual double stars made in 2016-2017, with PISCO2 installed at the 76-cm refractor of Côte d'Azur Observatory in Nice (France). Our observing list contains orbital couples as well as double stars whose motion is still uncertain. Three different techniques were used for obtaining meas…
Hidden by a star: The redshift and the offset broad line of the flat-spectrum radio quasar PKS 0903–57
Goldoni, P.; Boisson, C.; Pita, S. +5 more
Context. PKS 0903‑57 is a little-studied γ-ray blazar that has recently attracted considerable interest due to the strong flaring episodes observed since 2020 in high energy (HE; 100 MeV ≤ E ≤ 100 GeV) and very high-energy (VHE; 100 GeV ≤ E ≤ 10 TeV) γ-rays. Its nature and properties are still not well determined. In particular, it is unclear whet…
El rol de las características y evolución de las regiones activas solares en la producción de fulguraciones y eyecciones coronales de masa
López Fuentes, M.
Solar events such as flares and coronal mass ejections (CMEs) are the most energetic phenomena affecting interplanetary space in timescales from minutes to a few days. With the main aim of establishing parameters to be used in the prediction of phenomena with potential impact on space weather, there has been in recent years a strong interest in de…
X-rays from a newly discovered superbubble in M31
Li, Hui; Mao, Junjie; Cui, Wei +3 more
A superbubble is a hot, dilute, and X-ray-emitting gas cavity produced by stellar winds and supernova explosions. It is an intriguing feature for the study of stellar feedback processes. We report a study of possible superbubbles in the Andromeda Galaxy (M31). We identify one out of 83 extended sources as a strong superbubble candidate, SB1, from …