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The Relative Prevalence of Wave Packets and Coherent Structures in the Inertial and Kinetic Ranges of Turbulence as Seen by Solar Orbiter
Dudok de Wit, Thierry; Bendt, Alina; Chapman, Sandra
The Solar Orbiter (SO) mission provides the opportunity to study the evolution of solar wind turbulence. We use SO observations of nine extended intervals of homogeneous turbulence to determine when turbulent magnetic field fluctuations may be characterized as: (i) wave packets and (ii) coherent structures (CSs). We perform the first systematic sc…
JWST Reveals Bulge-dominated Star-forming Galaxies at Cosmic Noon
van Dokkum, Pieter; van der Wel, Arjen; Bezanson, Rachel +10 more
Hubble Space Telescope imaging shows that most star-forming galaxies at cosmic noon—the peak of cosmic star formation history—appear disk-dominated, leaving the origin of the dense cores in their quiescent descendants unclear. With the James Webb Space Telescope's high-resolution imaging to 5 µm, we can now map the rest-frame near-infrared e…
2FHL J1745.1–3035: A Newly Discovered, Powerful Pulsar Wind Nebula Candidate
Vignali, C.; Ajello, M.; Tibaldo, L. +8 more
We present a multi-epoch, multi-observatory X-ray analysis for 2FHL J1745.1–3035, a newly discovered very high-energy Galactic source detected by the Fermi Large Area Telescope (LAT) located in close proximity to the Galactic Center (l = 358.°5319; b = ‑0.°7760). The source shows a very hard γ-ray photon index above 50 GeV, Γ γ = 1.2 ±…
A Precursor to Solar Prominence Eruptions: Detection and Analysis of EUV Prominence Oscillations
Foullon, Claire; Verwichte, Erwin; Beckwith-Chandler, William
The eruption of prominences can have a significant influence on the solar–terrestrial environment. However, accurately predicting these eruptions remains a challenge. We apply automated detection methods for extreme ultraviolet (EUV) prominences observed by the twin spacecraft from the Solar Terrestrial Relations Observatory (STEREO) mission and t…
The Differences in the Origination and Properties of the Near-Earth Solar Wind between Solar Cycles 23 and 24
Fu, Hui; Xia, Lidong; Huang, Zhenghua +5 more
The dependence of the sources and properties of the near-Earth solar wind on solar cycle activity is an important issue in solar and space physics. We use the improved "two-step" mapping procedure that takes into account the initial acceleration processes to trace the near-Earth solar winds back to their source regions from 1999–2020, covering sol…
Visit Nearby Halo Substructures Using LAMOST DR9 MRS Data
Zhao, Gang; Zhao, Jing-Kun; Gao, Qi +3 more
Based on the LAMOST DR9 Medium Resolution Spectra (MRS) catalog, combined with astrometries from Gaia DR3, we conducted an investigation into the substructures in the stellar halo to obtain their chemical and kinematic information. We employed the HDBSCAN algorithm in the (L z , E, L xy ) space for clustering and utilized M…
SAUNAS. II. Discovery of Cross-shaped X-Ray Emission and a Rotating Circumnuclear Disk in the Supermassive S0 Galaxy NGC 5084
Koekemoer, Anton M.; Laine, Seppo; Lopez-Rodriguez, Enrique +11 more
Combining Chandra, Atacama Large Millimeter/submillimeter Array, EVLA, and Hubble Space Telescope archival data and newly acquired data from the Apache Point Observatory/Dual Imaging Spectrograph, we detect a double-lobed 17 kpc X-ray emission with plumes oriented approximately perpendicular and parallel to the galactic plane of the massive lentic…
Cold Water Emission Cannot Be Used to Infer Depletion of Bulk Elemental Oxygen [O/H] in Disks
Gorti, Uma; Ruaud, Maxime
We reexamine the constraints provided by Herschel Space Observatory data regarding cold water emission from protoplanetary disks. Previous disk models that were used to interpret observed water emission concluded that oxygen (O/H) is depleted by at least 2 orders of magnitude if a standard, interstellar gas/dust mass ratio is assumed in the disk. …
Investigating the Mass of the Black Hole and Possible Wind Outflow of the Accretion Disk in the Tidal Disruption Event AT2021ehb
Drake, Jeremy J.; Zoghbi, Abderahmen; Miller, Jon M. +11 more
Tidal disruption events (TDEs) can potentially probe low-mass black holes (BHs) in host galaxies that might not adhere to bulge or stellar-dispersion relationships. At least initially, TDEs can also reveal super-Eddington accretion. X-ray spectroscopy can potentially constrain BH masses, and reveal ionized outflows associated with super-Eddington …
Persistent Homology Analysis for Solar Magnetograms
Toriumi, Shin; Katsukawa, Yukio; Orozco Suárez, D. +1 more
Understanding the magnetic fields of the Sun is essential for unraveling the underlying mechanisms driving solar activity. Integrating topological data analysis techniques into these investigations can provide valuable insights into the intricate structures of magnetic fields, enhancing our comprehension of solar activity and its implications. In …