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Local Transition of Electron Pitch Angle Distribution within Flux Pileup Region behind Dipolarization Front
Cao, J. B.; Liu, Y. Y.; Liu, C. M. +2 more
Dipolarization fronts (DFs), earthward-propagating magnetic transients with a strong magnetic field, are important regions favorable for energetic electron acceleration in the magnetotail. The DF-driven electron acceleration usually generates coherent pitch angle distributions (PADs) inside flux pileup regions (FPRs), i.e., strong magnetic field r…
Lithium Cepheid V708 Car with an unusual chemical composition
Werner, K.; Korotin, S. A.; Andrievsky, S. M. +2 more
Aims: The purpose of this work is to spectroscopically analyse the classical Cepheid V708 Car. A preliminary check of the spectrum of V708 Car showed that this is a lithium-rich supergiant. We also found that V708 Car has an unusual chemical composition in that the abundances of various elements correlate with their condensation temperatures.…
Extreme-value modelling of the brightest galaxies at z ≳ 9
Silk, Joseph; Heather, Cameron; Chantavat, Teeraparb +1 more
Data from the JWST have revealed an intriguing population of bright galaxies at high redshifts. In this work, we use extreme-value statistics to calculate the distribution [in ultraviolet (UV) magnitude] of the brightest galaxies in the redshift range
A kinematical study of the launching region of the blueshifted HH 46/47 outflow with SINFONI K-band observations
Dougados, C.; Zhang, Y.; Nisini, B. +3 more
Context. Studying outflows is important, as they may significantly contribute to angular momentum removal from a star-disc system and thus affect disc evolution and planet formation. Aims. To investigate the different outflow components, including the collimated jet, wide-angled molecular outflow, and outflow cavity, of the Class I HH 46/47 outflo…
Nature of the diffuse emission sources in the H I supershell in the galaxy IC 1613
Egorov, Oleg V.; Yarovova, Anastasiya D.; Gerasimov, Ivan S. +6 more
We present a study of the nearby low-metallicity dwarf galaxy IC 1613, focusing on the search for massive stars and related feedback processes, as well as for faint supernova remnants (SNR) in late stages of evolution. We obtained the deepest images of IC 1613 in the narrow-band H α, He II and [S II] emission lines and new long-slit spectroscopy o…
Asteroseismological Analysis of the Non-Blazhko RRab Star EPIC 248846335 in the LAMOST–Kepler/K2 Project
Liu, Gao-Chao; Zong, Weikai; Fu, Jian-Ning +9 more
We conduct an asteroseismological analysis on the non-Blazhko ab-type RR Lyrae star EPIC 248846335, employing the Radial Stellar Pulsations module of the Modules for Experiments in Stellar Astrophysics based on the set of stellar parameters. The atmospheric parameters T eff = 6933 ± 70 K, log g = 3.35 ± 0.50, and [Fe/H] = ‑1.18 ± 0.14 a…
Constraining the low-energy cosmic ray flux in the center molecular zone from MeV nuclear deexcitation line observations
Liu, Bing; Yang, Ruizhi
Low-energy cosmic rays (LECRs) dominate the ionization in dense regions of molecular clouds in which other ionizers such as UV or x-ray photons are effectively shielded. Thus, it was argued that the high ionization rate at the central molecular zone (CMZ) of our Galaxy is mainly caused by LECRs. However, the required LECR flux is orders of magnitu…
Bright spectroscopic binaries: III. Binary systems with orbital periods of P > 500 days
Jack, Dennis; Schröder, Klaus-Peter; Hernández Huerta, Missael Alejandro +1 more
We present an analysis of nine bright spectroscopic binaries (HD 1585, HD 6613, HD 12390, HD 39923, HD 55201, HD 147430, HD 195543, HD 202699, HD 221643), which have orbital periods of P>500 days. These well-separated binaries are the last stars of our sample that we observed with the TIGRE telescope obtaining intermediate-resolution spectra of…
Probabilistic and progressive deblended far-infrared and sub-millimetre point source catalogues. I. Methodology and first application in the COSMOS field
Jarvis, Matt J.; Pearson, William J.; Vaccari, Mattia +12 more
Context. Single-dish far-infrared (far-IR) and sub-millimetre (sub-mm) point source catalogues and their connections with galaxy catalogues at other wavelengths are of paramount importance to studying galaxy evolution. However, due to the large mismatch in spatial resolution, cross-matching galaxies detected at different wavelengths is not straigh…
Regarding the relativistic electron dynamics in the outer radiation belt: a historical view
Stepanova, Marina; Pinto, Victor; Antonova, Elizaveta
The start of the space era marked the discovery of the Earth's radiation belts. Sixty-five years after that discovery, there are still many unknowns in its dynamics, but there is also a lot of understanding about many processes. This review summarizes a broad overview of a particular topic: the effect of geomagnetic storms on the radiation belts f…