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Repeated pattern of gamma-ray flares in the light curve of the blazar 3C 279
Larionov, V. M.; Blinov, D.; Jorstad, S. G. +10 more
The optical polarization plane of some blazars occasionally exhibits smooth hundred degree long rotations. Multiple theoretical models have been proposed to explain the nature of such events. A deterministic origin of these rotations, however, remains uncertain. We aim to find repeating patterns of flares in gamma-ray light curves of blazars, whic…
A revised cone model and its application to non-radial prominence eruptions
Zhang, Q. M.
Context. The traditional cone models achieve great success in studying the geometrical and kinematic properties of halo coronal mass ejections (CMEs).
Aims: In this Letter, a revised cone model is proposed to investigate the properties of CMEs as a result of non-radial prominence eruptions.
Methods: The cone apex is located at the source…
Decoding the morphological evolution of open clusters
Hu, Qingshun; Zhang, Yu; Esamdin, Ali
Context. The properties of open clusters such as metallicity, age, and morphology are useful tools in studies of the dynamic evolution of open clusters. The morphology of open clusters can help us better understand the evolution of such structures.
Aims: We aim to analyze the morphological evolution of 1256 open clusters by combining the shap…
Wind-luminosity evolution in NLS1 AGN 1H 0707-495
Fabian, Andrew C.; Walton, Dominic J.; Guainazzi, Matteo +7 more
Ultrafast outflows (UFOs) have been detected in the high-quality X-ray spectra of a number of active galactic nuclei (AGNs) with fairly high accretion rates and are thought to significantly contribute to the AGN feedback. After a decade of dedicated study, their launching mechanisms and structure are still not well understood, but variability tech…
Delta Deposits on Mars: A Global Perspective
Hauber, E.; Breuer, D.; De Toffoli, B. +1 more
Deltas have long been considered a constraining element to reconstruct the water level of an ancient ocean that may have once occupied the northern lowlands of Mars, and recently this hypothesis started to be challenged. We investigate this hypothesis and present a global inventory of fan-shaped features showing typical deltaic traits across the e…
Mesoscale and Small-Scale Structure of the Subauroral Geospace
Mishin, Evgeny; Streltsov, Anatoly
χ1 Fornacis cluster DANCe. Census of stars, structure, and kinematics of the cluster with Gaia-EDR3
Miret-Roig, N.; Bouy, H.; Sarro, L. M. +4 more
Context. The χ1 Fornacis cluster (Alessi 13) is one of a few open clusters of its age and distance in the Solar neighbourhood that ought to benefit from more attention as it can serve as a cornerstone for numerous future studies related to star and planet formation.
Aims: We take advantage of the early installment of the third data…
Molecular cloud catalogue from 13CO (1-0) data of the Forgotten Quadrant Survey
Rygl, K. L. J.; Testi, L.; Benedettini, M. +13 more
Context. New-generation spectroscopic surveys of the Milky Way plane have been revealing the structure of the interstellar medium, allowing the simultaneous study of dense structures from single star-forming objects or systems to entire spiral arms.
Aims: The good sensitivity of the new surveys and the development of dedicated algorithms now …
The kinematics of Small Magellanic Cloud star clusters
Piatti, Andrés E.
We report results of the proper motions of 25 known Small Magellanic Cloud (SMC) clusters (ages ∼ 1-10 Gyr old) derived from Gaia EDR3 data sets. When these mean proper motions were gathered with existent radial velocity measurements to compose the clusters' velocity vectors, we found the parameter values of a rotation disk that best resemble thei…
Presence of red giant population in the foreground stellar substructure of the Small Magellanic Cloud
Kartha, Sreeja S.; de Grijs, Richard; Cioni, Maria-Rosa L. +8 more
The eastern region of the Small Magellanic Cloud (SMC) is found to have a foreground stellar substructure, which is identified as a distance bimodality (~12 kpc apart) in the previous studies using red clump (RC) stars. Interestingly, studies of red giant branch (RGB) stars in the eastern SMC indicate a bimodal radial velocity (RV) distribution. I…