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On the Kinematic Nature of Apparent Disks at High Redshifts: Local Counterparts are Not Dominated by Ordered Rotation but by Tangentially Anisotropic Random Motion
Cappellari, Michele; Gao, Hua; Peng, Yingjie +2 more
It is not straightforward to physically interpret the apparent morphology of galaxies. Recent observations by the James Webb Space Telescope (JWST) revealed a dominant galaxy population at high redshifts (z > 2) that were visually classified as disks for their flattened shapes and/or exponential light profiles. The extensively accepted interpre…
Unveiling the chemical fingerprint of phosphorus-rich stars: II. Heavy-element abundances from UVES/VLT spectra
Masseron, Thomas; García-Hernández, D. A.; Pignatari, Marco +2 more
Context. The atmospheres of phosphorus-rich (P-rich) stars have been shown to contain between 10 and 100 times more P than our Sun. Given its crucial role as an essential element for life, it is especially necessary to uncover the origin of P-rich stars to gain insights into the still unknown nucleosynthetic formation pathways of P in our Galaxy. …
B-Plane Resonant Flybys: Theory Extension to Elliptical Orbits and Dynamic Programming Application
Colombo, Camilla; Campiti, Giulio; Masat, Alessandro
A convenient formalism for the design of resonant flyby trajectories is the B-plane, where postencounter orbits with target resonance conditions or semimajor axes can be analytically mapped. This framework has been developed by many authors starting from the classical Öpik's theory for close encounters, but it still relies on the approximation of …
The extended halo and tidal tails of the old open cluster NGC 2112
Gao, Xinhua; Zhu, Chengyu
This paper investigates the spatial structure and tidal tails of the nearby (
Varying water activity and momentum transfer on comet 67P/Churyumov-Gerasimenko from its non-gravitational forces and torques
Keller, H. U.; Groussin, O.; Attree, N. +9 more
Aims. We investigate the ability of a simultaneous fitting of comet 67P/Churyumov-Gerasimenko's non-gravitational forces, torques, and total water-outgassing rate, as observed by Rosetta, to constrain complex thermophysical models of cometary material. Methods. We extend the previous work of fitting geographically defined surface outgassing models…
SAUNAS. I. Searching for Low Surface Brightness X-Ray Emission with Chandra/ACIS
Koekemoer, Anton M.; Laine, Seppo; Lopez-Rodriguez, Enrique +8 more
We present Selective Amplification of Ultra Noisy Astronomical Signal (SAUNAS), a pipeline designed for detecting diffuse X-ray emission in the data obtained with the Advanced CCD Imaging Spectrometer (ACIS) of the Chandra X-ray Observatory. SAUNAS queries the available observations in the Chandra archive and performs photometric calibration, poin…
Extreme-ultraviolet (EUV) observables of simulated plasmoid-mediated reconnection in the solar corona
Martínez-Sykora, J.; Carlsson, M.; Nóbrega-Siverio, D. +1 more
Context. Understanding the role of magnetic reconnection in the heating and dynamics of the solar atmosphere requires detailed observational data of any observable aspect of the reconnection process, including small-scale features such as plasmoids.
Aims: Here, we examine the capability of active and upcoming instruments to detect plasmoids g…
Supernova Ejecta with Crystalline Silicate Dust in the Supernova Remnant MSH 15–52
Onaka, Takashi; Koo, Bon-Chul; Kim, Hyun-Jeong
IRAS 15099-5856 in the young supernova remnant (SNR) MSH 15‑52 is the first and only SNR-associated object with crystalline silicate dust detected so far, although its nature and the origin of the crystalline silicate are still unclear. In this paper, we present high-resolution mid-infrared (MIR) imaging observations of the bright central compact …
An Algorithm for the Determination of Coronal Mass Ejection Kinematic Parameters Based on Machine Learning
Shen, Fang; Yang, Yi; Li, Yucong +2 more
Coronal mass ejections (CMEs) constitute the major source of severe space weather events, with the potential to cause enormous damage to humans and spacecraft in space. It is becoming increasingly important to detect and track CMEs, since there are more and more space activities and facilities. We have developed a new algorithm to automatically de…
Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare
Morselli, A.; Chen, A. W.; Iacolina, M. N. +32 more
PKS 1830 -211 is a γ-ray emitting, high-redshift (z =2.507 ± 0.002), lensed flat-spectrum radio quasar. During the period 2019 mid-February to mid-April, this source underwent a series of strong γ-ray flares that were detected by both AGILE-GRID (Gamma-Ray Imaging Detector) and Fermi Large Area Telescope (Fermi-LAT), reaching a maximum γ-ray flux …