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A Catalog of Pulsar X-Ray Filaments
Romani, Roger W.; Dinsmore, Jack T.
We present the first Chandra X-ray Observatory (CXO) catalog of "pulsar X-ray filaments," or "misaligned outflows." These are linear, synchrotron-radiating features powered by ultrarelativistic electrons and positrons that escape from bow shock pulsars. The filaments are misaligned with the (large) pulsar velocity, distinguishing them from the pul…
On the similarity of rotational motion of dust particles in the inner atmosphere of comets
Fulle, M.; Moreno, F.; Rotundi, A. +6 more
In situ measurements of individual dust grain parameters in the immediate vicinity of a cometary nucleus are being carried by the Rosetta spacecraft at comet 67P/Churyumov-Gerasimenko. For interpretation of these observational data, a model of dust grain motion as realistic as possible is requested. In particular, the results of Stardust mission a…
3He and Fe Spectral Properties in 3He-rich Solar Energetic Particle Events
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Allen, R. C. +4 more
We have surveyed 3He-rich events on the Solar Orbiter mission from 2020 April to 2024 April, selecting isolated injections whose rollover 3He spectral shape is presumed to represent the initial acceleration state, unprocessed by subsequent activity such as coronal mass ejections or jets. A main goal has been to find relations…
A search for extragalactic fast optical transients in the Tomo-e Gozen high-cadence survey
Kobayashi, Naoto; Arimatsu, Ko; Tominaga, Nozomu +15 more
The population of optical transients evolving within a time-scale of a few hours or a day (so-called fast optical transients, FOTs) has recently been debated extensively. In particular, our understanding of extragalactic FOTs and their rates is limited. We present a search for extragalactic FOTs with the Tomo-e Gozen high-cadence survey. Using the…
ALMA-LEGUS. I. The Influence of Galaxy Morphology on Molecular Cloud Properties
Grebel, Eva K.; Smith, Linda J.; Aloisi, Alessandra +24 more
We present a comparative study of the molecular gas in two galaxies from the Legacy ExtraGalactic UV Survey (LEGUS) sample: barred spiral NGC 1313 and flocculent spiral NGC 7793. These two galaxies have similar masses, metallicities, and star formation rates, but NGC 1313 is forming significantly more massive star clusters than NGC 7793, especiall…
Circumnuclear Dust in Luminous Early-type Galaxies. I. Sample Properties and Stellar Luminosity Models
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +8 more
Dusty circumnuclear disks (CNDs) in luminous early-type galaxies (ETGs) show regular, dynamically cold molecular gas kinematics. For a growing number of ETGs, Atacama Large Millimeter/sub-millimeter Array (ALMA) CO imaging and detailed gas-dynamical modeling facilitate moderate-to-high precision black hole (BH) mass (M BH) determination…
Spatially resolved plasma composition evolution in a solar flare – The effect of reconnection outflow
Long, David M.; Brooks, David H.; Baker, Deborah +6 more
Context. Solar flares exhibit complex variations in elemental abundances compared to photospheric values. These abundance variations, characterized by the first ionization potential (FIP) bias, remain challenging to interpret. Aims. We aim to (1) examine the spatial and temporal evolution of coronal abundances in the X8.2 flare on 2017 September 1…
Water-Ice Dominated Spectra of Saturn's Rings and Small Moons From JWST
Fletcher, L. N.; Hedman, M. M.; Showalter, M. R. +11 more
JWST measured the infrared spectra of Saturn's rings and several of its small moons (Epimetheus, Pandora, Telesto, and Pallene) as part of Guaranteed Time Observation program 1247. The NIRSpec instrument obtained near-infrared spectra of the small moons between 0.6 and 5.3 microns, which are all dominated by water-ice absorption bands. The shapes …
Dynamical Masses for the Hyades Binary System vB 120
Torres, Guillermo; Latham, David W.; Stefanik, Robert P.
We report spectroscopic observations of vB 120 (HD 30712), a 5.7 yr astrometric-spectroscopic binary system in the Hyades cluster. We combine our radial velocities with others from the literature, and with existing speckle interferometry measurements, to derive an improved 3D orbit for the system. We infer component masses of M 1 = 1.06…
A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752
Chen, Li; Zhong, Jing; Qin, Songmei +3 more
Context. NGC 752 is a well-known Galactic open cluster of intermediate age. In recent works, a very long and asymmetric tail was revealed. A blue straggler star (BSS) at the periphery of the tidal tail of the cluster was subsequently identified.
Aims: We aim to perform a detailed analysis of the newly detected BSS based on the available compr…