Search Publications
Implications of Different Solar Photospheric Flux-transport Models for Global Coronal and Heliospheric Modeling
Cheung, Mark C. M.; DeRosa, Marc L.; Barnes, Graham +3 more
The concept of surface-flux transport (SFT) is commonly used in evolving models of the large-scale solar surface magnetic field. These photospheric models are used to determine the large-scale structure of the overlying coronal magnetic field, as well as to make predictions about the fields and flows that structure the solar wind. We compare predi…
First Results from the JWST Early Release Science Program Q3D: Benchmark Comparison of Optical and Mid-infrared Tracers of a Dusty, Ionized Red Quasar Wind at z = 0.435
Shen, Lu; Johnson, Sean D.; Lützgendorf, Nora +27 more
The [O III] 5007 Å emission line is the most common tracer of warm, ionized outflows in active galactic nuclei across cosmic time. JWST newly allows us to use mid-IR spectral features at both high spatial and spectral resolution to probe these same winds. Here we present a comparison of ground-based, seeing-limited [O III] and space-based, diffrac…
Lyα Scattering Models Trace Accretion and Outflow Kinematics in T Tauri Systems
Herczeg, Gregory J.; France, Kevin; Ábrahám, Péter +18 more
T Tauri stars produce broad Lyα emission lines that contribute ~88% of the total UV flux incident on the inner circumstellar disks. Lyα photons are generated at the accretion shocks and in the protostellar chromospheres and must travel through accretion flows, winds, and jets, the protoplanetary disks, and the interstellar medium before reaching t…
Pixelated Reconstruction of Foreground Density and Background Surface Brightness in Gravitational Lensing Systems Using Recurrent Inference Machines
Hezaveh, Yashar; Adam, Alexandre; Perreault-Levasseur, Laurence +1 more
Modeling strong gravitational lenses in order to quantify distortions in the images of background sources and to reconstruct the mass density in foreground lenses has been a difficult computational challenge. As the quality of gravitational lens images increases, the task of fully exploiting the information they contain becomes computationally and…
A Large-scale Kinematic Study of Molecular Gas in High-z Cluster Galaxies: Evidence for High Levels of Kinematic Asymmetry
Cooper, M. C.; Clements, D. L.; van Kampen, E. +14 more
We investigate the resolved kinematics of the molecular gas, as traced by the Atacama Large Millimeter/submillimeter Array in CO (2-1), of 25 cluster member galaxies across three different clusters at a redshift of z ~ 1.6. This is the first large-scale analysis of the molecular gas kinematics of cluster galaxies at this redshift. By separately es…
The Close AGN Reference Survey (CARS): An Interplay between Radio Jets and AGN Radiation in the Radio-quiet AGN HE0040-1105
Gaspari, M.; Combes, F.; O'Dea, C. P. +14 more
We present a case study of HE 0040-1105, an unobscured radio-quiet active galactic nucleus (AGN) at a high accretion rate of λ Edd = 0.19 ± 0.04. This particular AGN hosts an ionized gas outflow with the largest spatial offset from its nucleus compared to all other AGNs in the Close AGN Reference Survey. By combining multiwavelength obs…
The Space Weather Context of the First Extreme Event of Solar Cycle 25, on 2022 September 5
Vourlidas, Angelos; Kouloumvakos, Athanasios; Papaioannou, Athanasios +3 more
The coronal mass ejection (CME) on 2022 September 5 was the fastest CME yet observed and measured in situ by a spacecraft inside the corona (0.06 au for the Parker Solar Probe). Here we assess the significance of this event for space weather studies by analyzing the source region characteristics and its temporal evolution via a magnetic complexity…
Magnetic Fields and Fragmentation of Filaments in the Hub of California-X
Kwon, Woojin; Soam, Archana; Cho, Jungyeon +4 more
We present 850 µm polarization and C18O (3-2) molecular line observations toward the X-shaped nebula in the California molecular cloud using James Clerk Maxwell Telescope (JCMT)'s SCUBA-2/POL-2 and HARP instruments. The 850 µm emission shows that the observed region includes two elongated filamentary structures (Fil1 and Fil…
Hard X-Ray Observation and Multiwavelength Study of the PeVatron Candidate Pulsar Wind Nebula "Dragonfly"
Woo, Jooyun; An, Hongjun; Gelfand, Joseph D. +5 more
We studied the PeVatron nature of the pulsar wind nebula (PWN) G75.2+0.1 ("Dragonfly") as part of our NuSTAR observational campaign of energetic PWNe. The Dragonfly is spatially coincident with LHAASO J2018+3651, whose maximum photon energy is 0.27 PeV. We detected a compact (radius $1^{\prime} $ ) inner nebula of the Dragonfly without a spectral …
Multipoint Turbulence Analysis with HelioSwarm
Servidio, Sergio; Pecora, Francesco; Primavera, Leonardo +3 more
Exploration of plasma dynamics in space, including turbulence, is entering a new era of multisatellite constellation measurements that will determine fundamental properties with unprecedented precision. Familiar but imprecise approximations will need to be abandoned and replaced with more-advanced approaches. We present a preparatory study of the …