Search Publications
Missions
Journals
Publication Years
No evidence for a strong decrease of planetesimal accretion in old white dwarfs
Blouin, Simon; Xu, Siyi
A large fraction of white dwarfs are accreting or have recently accreted rocky material from their planetary systems, thereby 'polluting' their atmospheres with elements heavier than helium. In recent years, the quest for mechanisms that can deliver planetesimals to the immediate vicinity of their central white dwarfs has stimulated a flurry of mo…
The XXL survey. XLVI. Forward cosmological analysis of the C1 cluster sample
Umetsu, Keiichi; Gastaldello, Fabio; Sereno, Mauro +15 more
Context. We present the forward cosmological analysis of an XMM-selected sample of galaxy clusters out to a redshift of unity. We derive mass-observable relations in a self-consistent manner using the sample alone. Special care is given to the modelling of selection effects.
Aims: Following our previous 2018 study based on the dn/dz quantity …
The Sagittarius stream in Gaia Early Data Release 3 and the origin of the bifurcations
Antoja, T.; Ramos, P.; Arentsen, A. +6 more
Context. The Sagittarius dwarf spheroidal (Sgr) is a dissolving galaxy being tidally disrupted by the Milky Way (MW). Its stellar stream still poses serious modelling challenges, which hinders our ability to use it effectively as a prospective probe of the MW gravitational potential at large radii.
Aims: Our goal is to construct the largest a…
Investigating the Effect of Galaxy Interactions on Star Formation at 0.5 < z < 3.0
Hathi, Nimish P.; Kartaltepe, Jeyhan S.; Kocevski, Dale D. +24 more
Observations and simulations of interacting galaxies and mergers in the local universe have shown that interactions can significantly enhance the star formation rates (SFRs) and fueling of active galactic nuclei (AGN). However, at higher redshift, some simulations suggest that the level of star formation enhancement induced by interactions is lowe…
Measuring sloshing, merging, and feedback velocities in the Virgo cluster
Fabian, A. C.; Pinto, C.; Sanders, J. S. +5 more
We present a detailed analysis of the velocity structure of the Virgo cluster using XMM-Newton observations. Using a novel technique which uses the Cu K α instrumental line to calibrate the EPIC-pn energy scale, we are able to obtain velocity measurements with uncertainties down to Δv ~ 100 km s-1. We created 2D projected maps for the v…
Lithium depletion boundary, stellar associations, and Gaia
Montesinos, B.; Bayo, A.; Huélamo, N. +9 more
Context. Stellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques to estimate stellar ages are highly model-dependent. The lithium depletion boundary (LDB), based on the presence or absence of lithium in low-mass stars, can be used to derive ages in stellar associations of between 20 and 50…
CMEs and SEPs During November-December 2020: A Challenge for Real-Time Space Weather Forecasting
Maksimovic, Milan; Möstl, Christian; Galvin, Antoinette B. +20 more
Predictions of coronal mass ejections (CMEs) and solar energetic particles (SEPs) are a central issue in space weather forecasting. In recent years, interest in space weather predictions has expanded to include impacts at other planets beyond Earth as well as spacecraft scattered throughout the heliosphere. In this sense, the scope of space weathe…
The magnetic drivers of campfires seen by the Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter
Schmidt, W.; Woch, J.; Peter, H. +56 more
Context. The Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft observed small extreme ultraviolet (EUV) bursts, termed campfires, that have been proposed to be brightenings near the apexes of low-lying loops in the quiet-Sun atmosphere. The underlying magnetic processes driving these campfires are not understood.
Aim…
Low-cost Access to the Deep, High-cadence Sky: the Argus Optical Array
Law, Nicholas M.; Mann, Andrew W.; Corbett, Hank +16 more
New mass-produced, wide-field, small-aperture telescopes have the potential to revolutionize ground-based astronomy by greatly reducing the cost of collecting area. In this paper, we introduce a new class of large telescope based on these advances: an all-sky, arcsecond-resolution, 1000 telescope array which builds a simultaneously high-cadence an…
Alpha-Proton Differential Flow of the Young Solar Wind: Parker Solar Probe Observations
Bale, S. D.; Allen, R. C.; Raouafi, N. E. +5 more
The velocity of alpha particles relative to protons can vary depending on the solar wind type and distance from the Sun. Measurements from the previous spacecraft provided the alpha-proton differential velocities down to 0.3 au. The Parker Solar Probe (PSP) now enables insights into differential flows of the newly accelerated solar wind closer to …