Search Publications
The Quest for the Missing Dust. I. Restoring Large-scale Emission in Herschel Maps of Local Group Galaxies
Gordon, Karl D.; Bot, Caroline; Clark, Christopher J. R. +2 more
Because the galaxies of the Local Group have such large angular sizes, much of their diffuse, large-angular-scale emission is filtered out by the Herschel data reduction process. In this work, we restore this previously missed dust in Herschel observations of the Large Magellanic Cloud, Small Magellanic Cloud, M31, and M33. We do this by combining…
Sympathetic Standard and Blowout Coronal Jets Observed in a Polar Coronal Hole
Shen, Yuandeng; Zhou, Chengrui; Zhou, Xinping +4 more
We present the sympathetic eruption of a standard and a blowout coronal jet originating from two adjacent coronal bright points (CBP1 and CBP2) in a polar coronal hole, using soft X-ray and extreme-ultraviolet observations respectively taken by the Hinode and the Solar Dynamics Observatory. In the event, a collimated jet with obvious westward late…
The Structural Connection between Coronal Mass Ejection Flux Ropes near the Sun and at 1 au
Gopalswamy, N.; Xie, H.; Akiyama, S.
We have performed the first comprehensive statistical analysis comparing flux rope (FR) structures of coronal mass ejections (CMEs) near the Sun and at 1 au, using Solar and Heliospheric Observatory and Solar Terrestrial Relations Observatory measurements for the two full solar cycles 23 and 24. This study aims to investigate the physical connecti…
Visibility Interpolation in Solar Hard X-Ray Imaging: Application to RHESSI and STIX
Massa, Paolo; Piana, Michele; Perracchione, Emma +1 more
Space telescopes for solar hard X-ray imaging provide observations made of sampled Fourier components of the incoming photon flux. The aim of this study is to design an image reconstruction method relying on enhanced visibility interpolation in the Fourier domain. The interpolation-based method is applied to synthetic visibilities generated by mea…
The CARMA-NRO Orion Survey: Filament Formation via Collision-induced Magnetic Reconnection—the Stick in Orion A
Mairs, Steve; Nakamura, Fumitaka; Klessen, Ralf S. +13 more
A unique filament is identified in the Herschel maps of the Orion A giant molecular cloud. The filament, which we name the Stick, is ruler-straight and at an early evolutionary stage. Transverse position-velocity diagrams show two velocity components closing in on the Stick. The filament shows consecutive rings/forks in C18O (1-0) chann…
Strongly Lensed Supernova Refsdal: Refining Time Delays Based on the Supernova Explosion Models
Nomoto, Ken'ichi; Blinnikov, Sergei; Baklanov, Petr +1 more
We explore the properties of supernova (SN) "Refsdal"—the first discovered gravitationally lensed SN with multiple images. A large magnification provided by the galactic-scale lens, augmented by the cluster lens, gave us a unique opportunity to perform a detailed modeling of a distant SN at $z\simeq 1.5$ . We present results of radiation hydrodyna…
A VLBA Survey of Radio Stars in the Orion Nebula Cluster. II. Astrometry
Menten, Karl M.; Forbrich, Jan; Reid, Mark J. +1 more
From Very Long Baseline Array (VLBA) observations we previously identified a population of 123 young stellar systems with nonthermal radio emission toward the core of the Orion Nebula Cluster (ONC). We find optical sources in the Gaia DR2 catalog for 34 of them within 0"2 of the radio positions. Most of the radio sources are likely companions of G…
The GALAH Survey: No Chemical Evidence of an Extragalactic Origin for the Nyx Stream
Lewis, Geraint F.; Ting, Yuan-Sen; Casey, Andrew R. +20 more
The results from the ESA Gaia astrometric mission and deep photometric surveys have revolutionized our knowledge of the Milky Way. There are many ongoing efforts to search these data for stellar substructure to find evidence of individual accretion events that built up the Milky Way and its halo. One of these newly identified features, called Nyx,…
Discovery, TESS Characterization, and Modeling of Pulsations in the Extremely Low-mass White Dwarf GD 278
Córsico, Alejandro H.; Hermes, J. J.; Bell, Keaton J. +5 more
We report the discovery of pulsations in the extremely low-mass (ELM), likely helium-core white dwarf GD 278 via ground- and space-based photometry. GD 278 was observed by the Transiting Exoplanet Survey Satellite (TESS) in Sector 18 at a 2 minute cadence for roughly 24 days. The TESS data reveal at least 19 significant periodicities between 2447 …
The Common Origin of High-energy Protons in Solar Energetic Particle Events and Sustained Gamma-Ray Emission from the Sun
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +2 more
We report that the number of >500 MeV protons (Ng) inferred from sustained gamma-ray emission (SGRE) from the Sun is significantly correlated with that of protons propagating into space (NSEP) as solar energetic particles (SEPs). Under the shock paradigm for SGRE, shocks driven by coronal mass ejections (CMEs) accelerate h…