Search Publications
A Tale of Three Dwarfs: Cluster-based Star Formation Histories of Blue Compact Dwarf Galaxies
Calzetti, Daniela; Whitmore, Bradley C.; Chandar, Rupali +9 more
We present a new study of the cluster populations in the blue compact dwarf galaxies (BCD) ESO185-IG13, ESO338-IG04, and Haro11, based on new and archival high-resolution images taken by the Hubble Space Telescope, and the first to probe the populations older than ≈100 Myr. BCDs are believed to experience intense bursts of star formation (includin…
Temperature Intermittent Structures in the Fast Solar Wind
Wang, Xin; Wang, Yuxin; Song, Dongze +1 more
In the solar wind turbulence, proton temperature fluctuations are highly intermittent, especially at small scales in the inertial range. This phenomenon may contain information about solar wind intermittent heating. However, the physical nature of the temperature intermittency is not yet clear. Based on the measurements from Solar Orbiter between …
Electron Densities of Transition Region Loops Derived from IRIS O IV Spectral Data
Fu, Hui; Xia, Lidong; Huang, Zhenghua +4 more
Loops are fundamental structures in the magnetized atmosphere of the Sun. Their physical properties are crucial for understanding the nature of the solar atmosphere. Transition region loops are relatively dynamic and their physical properties have not yet been fully understood. With spectral data of the line pair of O IV 1399.8 Å and 1401.2 Å (
Aperture and Resolution Effects on Ultraviolet Star-forming Properties: Insights from Local Galaxies and Implications for High-redshift Observations
Leitherer, Claus; Berg, Danielle A.; Arellano-Córdova, Karla Z. +2 more
We present an analysis of the effects of spectral resolution and aperture scale on derived galaxy properties using far-ultraviolet (FUV) spectra of local star-forming galaxies from the International Ultraviolet Explorer (R ∼ 250, field of view (FOV) ∼ 10″ × 20″) and Cosmic Origins Spectrograph on the Hubble Space Telescope (R ∼ 15,000, FOV ∼ 2.″5)…
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…