Search Publications
Suzaku and Chandra study of diffuse X-ray emission from the massive star-forming region RCW 38
Ezoe, Yuichiro; Odaka, Hirokazu; Fukushima, Aoto
In some massive star-forming regions, diffuse X-ray emission has been observed. It can be classified as thermal emission from sub- or several-keV plasmas, non-thermal emission represented by the power law, or a mixture of them. We have studied the nearby (~1.7 kpc) young massive star-forming region RCW 38. In a previous study, non-thermal diffuse …
Hydrothermal Alteration of Ultramafic Rocks in Ladon Basin, Mars—Insights From CaSSIS, HiRISE, CRISM, and CTX
Tornabene, Livio L.; Hauber, Ernst; Mège, Daniel +21 more
The evolution of the Ladon basin has been marked by intense geological activity and the discharge of huge volumes of water from the Martian highlands to the lowlands in the late Noachian and Hesperian. We explore the potential of the ExoMars Trace Gas Orbiter/Color and Stereo Surface Imaging System color image data set for geological interpretatio…
Dependence of Stellar Differential Rotation on Effective Temperature and Rotation: An Analysis from Starspot Transit Mapping
Valio, Adriana; Araújo, Alexandre
Stellar rotation is crucial for studying stellar evolution, since it provides information about age, angular momentum transfer, and magnetic fields of stars. In the case of the Sun, due to its proximity, detailed observation of sunspots at various latitudes and longitudes allows a precise estimation of the solar rotation period and its differentia…
Upstream Solar Wind Prediction up to Mars by an Operational Solar Wind Prediction System
Luo, Bingxian; Zhong, Qiuzhen; Liu, Siqing +10 more
Combining the upstream solar wind observations measured by Mars Atmosphere and Volatile Evolution (MAVEN), Advanced Composition Explorer(ACE) and Deep Space Climate Observatory (DSCOVR) from October 2014 to April 2021, we investigate the statistical properties of the background solar wind at Mars and Earth. By applying an operational solar wind pr…
An updated global survey of alluvial fans on Mars: Distinguishing alluvial fans from other fan-shaped features through morphologic characterization
Moersch, Jeffrey E.; Mondro, Claire A.; Fedo, Christopher M.
Alluvial fans formed on Mars during the late Hesperian to early Amazonian in a climatic transition from a time of regular surface water activity to the current dry and cold climate. The depositional environments recorded by alluvial fans represent the final era of potential habitability on the Martian surface. Alluvial fan deposits can often look …
Cyclical Behaviors of Sunspot-Group Tilt Angles in Solar Cycles 21 - 23
Gao, Peng-Xin
Based on the Debrecen Photoheliographic Data (DPD) sunspot catalog, we investigate the cyclical behaviors of tilt angles of all sunspot groups (SGs) and SGs with angular separation constraint S >2.5∘ in Solar Cycles (SCs) 21 - 23. It is found that, the cyclical behaviors of tilt angles during SC 23 are different from those of SCs 21 …
A monitoring campaign (2013-2020) of ESA's Mars Express to study interplanetary plasma scintillation
Bocanegra-Bahamón, T. M.; Molera Calvés, G.; Duev, D. A. +19 more
The radio signal transmitted by the Mars Express (MEX) spacecraft was observed regularly between the years 2013-2020 at X-band (8.42 GHz) using the European Very Long Baseline Interferometry (EVN) network and University of Tasmania's telescopes. We present a method to describe the solar wind parameters by quantifying the effects of plasma on our r…
The Emergence of a Neutral Wind Region in the Orbital Plane of Symbiotic Binaries during Their Outbursts
Skopal, Augustin
Accretion of mass onto a white dwarf (WD) in a binary system can lead to stellar explosions. If a WD accretes from stellar wind of a distant evolved giant in a symbiotic binary, it can undergo occasional outbursts in which it brightens by several magnitudes, produces a low- and high-velocity mass outflow, and, in some cases, ejects bipolar jets. I…
Anisotropies of solar energetic electrons in the MeV range measured with Solar Orbiter/EPD/HET
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Dresing, N. +4 more
Aims: This study analyses relativistic electron measurements obtained by the High Energy Telescope (HET) aboard Solar Orbiter in the energy range from 200 keV to above 10 MeV. Caveats of these measurements are discussed. The purpose of this study is to analyse anisotropies of relativistic solar energetic electrons utilising the different view…
Deep Herschel observations of the 2 Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum
Könyves, V.; Morganti, R.; Tadhunter, C. N. +5 more
The far-IR/sub-mm wavelength range contains a wealth of diagnostic information that is important for understanding the role of active galactic nuclei (AGN) in galaxy evolution. Here we present the results of Herschel PACS and SPIRE observations of a complete sample of 46 powerful 2 Jy radio AGN at intermediate redshifts (0.05 < z < 0.7), whi…