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The NuSTAR, XMM-Newton, and Suzaku View of A3395 at the Intercluster Filament Interface
Wik, Daniel R.; Tombesi, Francesco; Akamatsu, Hiroki +4 more
Galaxy clusters are the largest virialized objects in the universe. Their merger dynamics and their interactions with the cosmic filaments that connect them are important for our understanding of the formation of large-scale structure. In addition, cosmic filaments are thought to possess the missing baryons in the universe. Studying the interactio…
The Radiative Gas Dynamics of Spacecraft in the Martian Atmosphere
Surzhikov, S. T.
The problems of the radiative gas dynamics of the Martian space vehicles MSRO, Pathfinder, and Exomars-2016 are solved using the author's custom NERAT-2D radiative-gasdynamic code. The cause of considerable heating of the rear surface of the spacecraft by heat radiation in the Martian atmosphere is studied. Calculation studies of the spectral comp…
Polarimetric Behaviour of Various Lunar Impact Craters Derived from Chandrayaan-2 Dual-Frequency SAR Full-Pol L-Band Acquisitions
Das, A.; Putrevu, D.; Chakraborty, T. +4 more
Ch2 DFSAR provides the first opportunity to study Moon in L-band full-polarimetry. The paper presents results from polarimetric analysis of the impact craters.
Very Large Array Multiband Radio Imaging of the Triple AGN Candidate SDSS J0849+1114
Nyland, Kristina; Li, Zhiyuan; Hou, Meicun +3 more
Kiloparsec-scale triple active galactic nuclei (AGNs), potential precursors of gravitationally bound triple massive black holes (MBHs), are rarely seen objects and believed to play an important role in the evolution of MBHs and their host galaxies. In this work we present a multiband (3.0, 6.0, 10.0, and 15.0 GHz), high-resolution radio imaging of…
Mirror Mode Storms Observed by Solar Orbiter
Fedorov, A.; Karlsson, T.; Owen, C. J. +8 more
Mirror modes (MMs) are ubiquitous in space plasma and grow from pressure anisotropy. Together with other instabilities, they play a fundamental role in constraining the free energy contained in the plasma. This study focuses on MMs observed in the solar wind by Solar Orbiter (SolO) for heliocentric distances between 0.5 and 1 AU. Typically, MMs ha…
Noble gases in Dome C micrometeorites - An attempt to disentangle asteroidal and cometary sources
Trieloff, Mario; Engrand, Cécile; Duprat, Jean +2 more
We have performed a comprehensive noble gas study, including the isotopes of krypton and xenon, on a set of micrometeorites (MMs) collected from surface snow at Dome C (DC) on the Antarctic plateau. He and Ne are generally dominated by a solar component, with lower 4He concentrations and 4He/20Ne ratios in crystall…
Search for carbon-bearing compounds on low-albedo asteroids
Barucci, M. A.; Fornasier, S.; Matsuoka, M. +5 more
In this work, we aim to investigate the presence of absorption bands around 3.4 µm in the infrared spectra of primitive asteroids. We collected the published reflectance spectra of low-albedo asteroids from the literature and analysed the 2.4-3.8 µm region using the same techniques. From the initial data set of 92 asteroids, we restric…
On the lithium abundance of the visual binary components ξ Boo A ( G8V ) and ξ Boo B ( K5V )
Strassmeier, Klaus G.; Steffen, Matthias
A spectroscopic investigation of the lithium resonance doublet in ξ Boo A and ξ Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R = 130,000 spectra with a signal‑to‑noise ratio (S/N) per pixel of up to 3200 using the 11.8 m LBT and PEPSI. From fits with synthetic line profiles based on 1D‑LTE MARCS model atmospher…
An Analysis of the Eclipsing Binaries HD 71636, V1022 Cassiopeiae, and OT Andromedae
Henry, Gregory W.; Fekel, Francis C.; Sowell, James R. +3 more
We have obtained high-dispersion spectroscopy and BV photometry of two F-type eclipsing binaries, HD 71636 and V1022 Cas, plus the A-type system OT And. Transiting Exoplanet Survey Satellite measurements for each system have also been incorporated. The photometry of HD 71636 enables a more consistent picture of this 5.01331 days, circular-orbit sy…
SOFIA/FORCAST Monitoring of the Dust Emission from R Aqr: Start of the Eclipse
Gorti, Uma; Whitelock, Patricia A.; Wagner, R. Mark +3 more
We present mid-infrared (mid-IR) spectra from our continued monitoring of R Aquarii, the nearest symbiotic Mira, using the Stratospheric Observatory for Infrared Astronomy (SOFIA). New photometric and spectroscipic data were obtained with the Faint Object infraRed CAmera for the SOFIA Telescope in 2018 and 2019 after the system had started its "ec…