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Analysis of the Unconcentrated Background of the EPIC pn Camera on Board XMM-Newton
Esposito, Paolo; Tiengo, Andrea; De Luca, Andrea +8 more
Our understanding of the background of the EPIC/pn camera on board XMM-Newton is incomplete. This affects the study of extended sources and can influence the predictions of the expected background of future X-ray missions, such as the Advanced Telescope for High Energy Astrophysics (ATHENA). Here we provide new results based on the analysis of the…
Search for candidate strongly lensed dusty galaxies in the Planck satellite catalogues
Burigana, C.; Herranz, D.; Trombetti, T. +5 more
The shallow, all-sky Planck surveys at sub-millimetre wavelengths have detected the brightest strongly gravitationally lensed dusty galaxies in the sky. The combination of their extreme gravitational flux-boosting and image-stretching offers the unique possibility of measuring in extraordinary detail the galaxy structure and kinematics in early ev…
The role of gas kinematics in setting metallicity gradients at high redshift
Federrath, Christoph; Krumholz, Mark R.; Wisnioski, Emily +1 more
In this work, we explore the diversity of ionized gas kinematics (rotational velocity vϕ and velocity dispersion σg) and gas-phase metallicity gradients at 0.1 ≤ z ≤ 2.5 using a compiled data set of 74 galaxies resolved with ground-based integral field spectroscopy. We find that galaxies with the highest and the lowest σ…
Water and deuterium-to-hydrogen ratio in comets
Fulle, Marco
Recent models find that nuclei of comets are a mixture of water-rich and water-poor cm-sized pebbles. We aim to fit the correlation of the deuterium-to-hydrogen ratio, D/H, with the nucleus active area fraction. Pebble parameters, constrained by the Rosetta mission data, depend on where pebbles accreted in the protoplanetary disc. The diversity of…
The COS-legacy survey of C IV absorbers: properties and origins of the intervening systems
Charlton, Jane C.; Savage, Blair D.; Misawa, Toru +4 more
We present here results from a survey of intervening C IV absorbers at z < 0.16 conducted using 223 sightlines from the Hubble Spectroscopic Legacy Archive. Most systems (83%) out of the total sample of 69 have simple kinematics with 1 or 2 C IV components. In the 22 C IV systems with well constrained H I column densities, the temperatures from…
Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations
Fu, Song; Ge, Yasong
Wave-particle interactions play important roles in local acceleration and pitch angle scattering loss of charged particle dynamics in astrophysics and space physics, and energy transfer between plasma waves and particles is a key problem in plasma physics. Using full relativistic test particle simulations, we quantitatively evaluate the magnetoson…
Statistical study of electron density turbulence and ion-cyclotron waves in the inner heliosphere: Solar Orbiter observations
Maksimovic, M.; Bale, S. D.; Chust, T. +27 more
Context. The recently released spacecraft potential measured by the RPW instrument on board Solar Orbiter has been used to estimate the solar wind electron density in the inner heliosphere.
Aims: The measurement of the solar wind's electron density, taken in June 2020, has been analysed to obtain a thorough characterization of the turbulence …
Star Formation Histories from Spectral Energy Distributions and Color-magnitude Diagrams Agree: Evidence for Synchronized Star Formation in Local Volume Dwarf Galaxies over the Past 3 Gyr
McQuinn, Kristen B. W.; Johnson, Benjamin D.; Gawiser, Eric +6 more
Star formation histories (SFHs) reveal physical processes that influence how galaxies form their stellar mass. We compare the SFHs of a sample of 36 nearby (D ⪅ 4 Mpc) dwarf galaxies from the ACS Nearby Galaxy Survey Treasury (ANGST), inferred from the color-magnitude diagrams (CMDs) of individually resolved stars in these galaxies, with those rec…
The Deeper, Wider, Faster programme: exploring stellar flare activity with deep, fast cadenced DECam imaging via machine learning
Abbott, T. M. C.; Zhang, J.; Flynn, C. +9 more
We present our 500 pc distance-limited study of stellar flares using the Dark Energy Camera as part of the Deeper, Wider, Faster programme. The data were collected via continuous 20-s cadence g-band imaging and we identify 19 914 sources with precise distances from Gaia DR2 within 12, ~3 deg2, fields over a range of Galactic latitudes. …
Long-term X-ray variability of the symbiotic system RT Cru based on Chandra spectroscopy
Drake, J. J.; Karovska, M.; Danehkar, A. +1 more
RT Cru belongs to the rare class of hard X-ray emitting symbiotics, whose origin is not yet fully understood. In this work, we have conducted a detailed spectroscopic analysis of X-ray emission from RT Cru based on observations taken by the Chandra Observatory using the Low Energy Transmission Grating (LETG) on the High-Resolution Camera Spectrome…