Search Publications
The solar wind plasma upstream of Mars observed by Tianwen-1: Comparison with Mars Express and MAVEN
Fränz, Markus; He, Jiansen; Rong, Zhaojin +16 more
On the great journey to Mars, China's first planetary exploration mission, the Tianwen-1 came within 26 million kilometers of Mars from 31 October 2020 to 25 January 2021 and was getting closer to its destination, the red planet, in search of answers to the cataclysmic climate change that occurred in Martian history. Both the escape of the Martian…
Jansky Very Large Array Detections of CO(1-0) Emission in H I-absorption-selected Galaxies at z ≳ 2
Prochaska, J. X.; Revalski, M.; Rafelski, M. +3 more
We report a Karl G. Jansky Very Large Array search for redshifted CO(1-0) emission from three H I-absorption-selected galaxies at z ≈ 2, identified earlier in their CO(3-2) or CO(4-3) emission. We detect CO(1-0) emission from DLA B1228-113 at z ≈ 2.1933 and DLA J0918+1636 at z ≈ 2.5848; these are the first detections of CO(1-0) emission in high-z …
Revisiting the Revisited Palmer Consensus: New Insights from Jovian Electron Transport
Engelbrecht, N. Eugene; Burger, R. A.; Herbst, Konstantin +2 more
Novel insights into the behavior of the diffusion coefficients of charged particles in the inner heliosphere are of great importance to any study of the transport of these particles and are especially relevant with regard to the transport of low-energy electrons. The present study undertakes an exhaustive investigation into the diffusion parameter…
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique I. Orion A
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
Magnetic fields play an important role in the evolution of molecular clouds and star formation. Using the velocity gradient technique (VGT) model, we measured the magnetic field in Orion A using the 12CO, 13CO, and C18O(1-0) emission lines at a scale of ~0.07 pc. The measured B field shows an east-west orientation …
Transport Characteristics of a Hierarchical Near-Surface Layer of the Nucleus of Comet 67P/Churyumov-Gerasimenko
Blum, J.; Hartogh, P.; Rezac, L. +3 more
In this paper, we develop previous studies that considered a free molecular gas flow through a dust porous mantle of a cometary nucleus. Before, we considered various types of both homogeneous and heterogeneous layers built of nonintersecting spheres, including the layers containing microscopic cracks and inner cavities. At the same time, data fro…
The CH4 abundance in Jupiter's upper atmosphere
Sánchez-López, A.; Snellen, I. A. G.; López-Puertas, M. +3 more
Hydrocarbon species, and in particular CH4, play a key role in the stratosphere-thermosphere boundary of Jupiter, which occurs around the µ-bar pressure level. Previous analyses of solar occultation, He and Ly-α airglow, and ISO/SWS measurements of the radiance around 3.3 µm have inferred significantly different methane conc…
The cycle of metals in the infalling elliptical galaxy NGC 1404
Simionescu, A.; Mernier, F.; Pinto, C. +6 more
Hot atmospheres pervading galaxy clusters, groups, and early-type galaxies are rich in metals, produced during epochs and diffused via processes that are still to be determined. While this enrichment has been routinely investigated in clusters, metals in lower mass systems are more challenging to probe with standard X-ray exposures and spectroscop…
The Effect of Age on the Grouping of Open Clusters: The Primordial Group Hypothesis
Casado, Juan
The Primordial Group hypothesis states that only sufficiently young open clusters (OCs) can be multiple, and old OCs are essentially isolated. We tested this postulate through four different studies using a manual search of Gaia EDR3 and extensive literature. First, we revisited the work of de La Fuente Marcos and de La Fuente Marcos (2009), which…
The Psyche Topography and Geomorphology Investigation
Williams, David A.; Bell, James F.; Jaumann, Ralf +16 more
Detailed mapping of topography is crucial for the understanding of processes shaping the surfaces of planetary bodies. In particular, stereoscopic imagery makes a major contribution to topographic mapping and especially supports the geologic characterization of planetary surfaces. Image data provide the basis for extensive studies of the surface s…
APOGEE detection of N-rich stars in the tidal tails of Palomar 5
Cohen, Roger E.; Majewski, Steven R.; Horta, Danny +15 more
Recent results from chemical tagging studies using Apache Point Observatory Galactic Evolution Experiment data suggest a strong link between the chemical abundance patterns of stars found within globular clusters (GC), and chemically peculiar populations in the Galactic halo field. In this paper, we analyse the chemical compositions of stars withi…