Context. Apparent deviations between properties of dwarf galaxies from observations and simulations are known to exist, such as the "Missing Dwarfs" problem, the too-big-to-fail problem, and the cusp-core problem, to name a few. Recent studies have shown that these issues can at least be partially resolved by taking into account the systematic

We present the weak-lensing mass calibration of the stellar-mass-based μ ⋆ mass proxy for redMaPPer galaxy clusters in the Dark Energy Survey Year 1. For the first time, we are able to perform a calibration of μ ⋆ at high redshifts, z > 0.33. In a blinded analysis, we use ∼6000 clusters split into 12 subsets spanning the ranges 0.1 ≤ z < 0.65 and μ

We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multicolour photometry confirm that the white dwarf is cool (9950 ± 150 K) and has a low mass (0.45 ± 0.05 M ☉), and spectra and light curves suggest the brown dwarf has a mass of 0.067 ± 0.006 M ☉ (70M Jup) and a

Introduction: The Japanese spacecraft Hayabusa2 made the rendezvous with a C/F-type asteroid Ryugu from June 2018 to November 2019 [1]. After the global mapping and the first touch-down operation, Small Carry-on Impactor (SCI) operation was successfully conducted on 5 April 2019 to make an artificial crater (SCI crater) [2]. This operation aimed to

The VLT-FLAMES Tarantula Survey (VFTS) was an ESO Large Programme that has provided a rich, legacy dataset for studies of both resolved and integrated populations of massive stars. Initiated in 2008 (ESO Period 82), we used the Fibre Large Array Multi Element Spectrograph (FLAMES) to observe more than 800 massive stars in the dramatic 30 Doradus

We use a sample of 154 observations of 124 H II regions that have measurements of both T e[O III] and T e[N II], compiled from the literature, to explore the behaviour of the T e[O III]-T e[N II] temperature relation. We confirm that the relation depends on the degree of ionization and present a new set of relations for two different ranges of this