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Improved white dwarves constraints on inelastic dark matter and left-right symmetric models
Biswas, Anirban; Kar, Arpan; Kim, Hyomin +2 more
Weakly interacting massive particles (WIMPs) can be captured in compact stars such as white dwarves (WDs) if they are in a dark matter (DM)-rich environment, leading to an increase in the star luminosity through their annihilation process. N -body simulations suggest that the core of the Messier 4 globular cluster (where plenty of WDs are observed…
An XMM-Newton EPIC X-Ray View of the Symbiotic Star R Aquarii
Toalá, Jesús A.; Sabin, Laurence; Guerrero, Martín A. +2 more
We present the analysis of archival XMM-Newton European Photon Imaging Camera (EPIC) X-ray observations of the symbiotic star R Aquarii. We used the Extended Source Analysis Software package to disclose diffuse soft X-ray emission extending up to 2.'2 (≈0.27 pc) from this binary system. The depth of these XMM-Newton EPIC observations reveals in un…
Nonthermal Radio Continuum Emission from Young Nearby Stars
Reffert, Sabine; Forbrich, Jan; Loinard, Laurent +5 more
Young and magnetically active low-mass stars often exhibit nonthermal coronal radio emission owing to the gyration of electrons in their magnetized chromospheres. This emission is easily detectable at centimeter wavelengths with the current sensitivity of large radio interferometers like the Very Large Array (VLA). With the aim of identifying near…
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…