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Search for Hα Emitters at z 7.8: A Constraint on the Hα-based Star Formation Rate Density
Asada, Yoshihisa; Ohta, Kouji
We search for Hα emitters at z ~ 7.8 in four gravitationally lensed fields observed in the Hubble Frontier Fields program. We use the Lyman break method to select galaxies at the target redshift and perform photometry in the Spitzer/IRAC 5.8 µm band to detect Hα emission from the candidate galaxies. We find no significant detections of count…
Use of Twenty Years CLUSTER/FGM Data to Observe the Mean Behavior of the Magnetic Field and Current Density of Earth's Magnetosphere
Dunlop, M. W.; Robert, P.
The data from the CLUSTER FGM magnetometer, recorded for 20 years at ESA's Cluster Science Archive, as well as the position of the spacecraft, have been used to form a database aligned in time. It allows the calculation of curl(B) over all the lifetime of the mission (representing the current density via µ0J⃗=curl⃗>(B⃗>). The B⃗…
Megashears and hydrothermalism at the Martian crustal dichotomy in Valles Marineris
Langlais, Benoit; Mège, Daniel; Gurgurewicz, Joanna +2 more
Observations of ancient deep deformation systems on Mars are important for constraining planetary dynamics, as well as to identify potential mineral resources. However, such systems were thought to be unexposed and inaccessible to analysis. Here, we apply structural and hyperspectral analyses, and correlate results with magnetic anomaly patterns, …
New view of the Balmer-Kapteyn region: Cryptomare distribution and formation
Li, Fei; Yan, Jianguo; Gao, Wutong +4 more
Context. The cryptomare in the Balmer-Kapteyn region is the oldest one on the Moon. Determining the extent and formation of this feature can deepen our understanding of early mare volcanism and help establish temporal and spatial constraints on lunar thermal and volcanic history.
Aims: This paper focuses on the identification of lunar cryptom…
Asymmetric deformation of the Earth's magnetosphere under low Alfvén Mach number solar wind: Observations and MHD simulation
Kasahara, Satoshi; Lavraud, Benoit; Saito, Yoshifumi +5 more
The density of the solar wind plasma near the Earth's magnetosphere sometimes decreases to only several per cent of the usual value, and such density extrema result in a significant reduction of the dynamic pressure and Alfvén Mach number (
Identification of new hot subdwarf binary systems by means of Virtual Observatory tools
Álvarez, M. A.; Dafonte, C.; Manteiga, M. +7 more
The estimation of the binary fraction of hot subdwarfs is key to shed light on the different evolution scenarios proposed to explain the loss of the hydrogen envelope during the red giant branch phase. In this paper, we analyse the spectral energy distribution of the hot subdwarfs included in a recent and comprehensive catalogue with the aim of id…
Tomography of the Solar Corona with the Metis Coronagraph I: Predictive Simulations with Visible-Light Images
Romoli, Marco; Frassati, Federica; Bemporad, Alessandro +5 more
The Solar Orbiter/Metis coronagraph records full-Sun visible-light polarized brightness (p B -) images of the solar corona. This work investigates the utility of a synoptic observational program of Metis for tomographic reconstruction of the three-dimensional (3D) distribution of the electron density of the global solar corona. During its lifetime…
Machine learning for galactic archaeology: a chemistry-based neural network method for identification of accreted disc stars
Grand, Robert J. J.; Gómez, Facundo A.; Marinacci, Federico +4 more
We develop a method ('Galactic Archaeology Neural Network', GANN) based on neural network models (NNMs) to identify accreted stars in galactic discs by only their chemical fingerprint and age, using a suite of simulated galaxies from the Auriga Project. We train the network on the target galaxy's own local environment defined by the stellar halo a…
20 Orbits of binaries based on soar speckle observations
Docobo, José A.; Campo, Pedro P.; Mendez, Rene A. +3 more
New observational data obtained during the 2018, 2019, and 2020 speckle runs with the 4.1-m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the visual binaries: WDS 00277-1625 (YR 1 Aa,Ab), WDS 00462-2214 (RST4155), WDS 03124-4425 (JC 8), WDS 07427-3510 (HDS 1091), WDS 10093+…
Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
Takata, J.; Chen, A. M.
Be/γ-ray binaries comprise a confirmed or presumptive pulsar orbiting a Be star and emit luminous γ-rays. Non-thermal emissions are thought to arise from synchrotron radiation and inverse-Compton (IC) scattering in the shock where the pulsar wind is terminated by the stellar outflow. We study wind interactions and shock radiations from such system…