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Cosmological implications of the anisotropy of ten galaxy cluster scaling relations
Lovisari, L.; Pacaud, F.; Ramos-Ceja, M. E. +5 more
The hypothesis that the late Universe is isotropic and homogeneous is adopted by most cosmological studies, including studies of galaxy clusters. The cosmic expansion rate H0 is thought to be spatially constant, while bulk flows are often presumed to be negligible compared to the Hubble expansion, even at local scales. The effects of bu…
The evolution of the galaxy stellar-mass function over the last 12 billion years from a combination of ground-based and HST surveys
Cullen, F.; McLure, R. J.; Dunlop, J. S. +3 more
We present a new determination of the galaxy stellar-mass function (GSMF) over the redshift interval 0.25 ≤ z ≤ 3.75, derived from a combination of ground-based and Hubble Space Telescope (HST) imaging surveys. Based on a near-IR-selected galaxy sample selected over a raw survey area of 3 deg2 and spanning ≥4 dex in stellar mass, we fit…
The LSST DESC DC2 Simulated Sky Survey
Aubourg, Éric; Wood-Vasey, W. Michael; Mandelbaum, Rachel +77 more
We describe the simulated sky survey underlying the second data challenge (DC2) carried out in preparation for analysis of the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST) by the LSST Dark Energy Science Collaboration (LSST DESC). Significant connections across multiple science domains will be a hallmark of LSST; the DC2 progra…
A highly magnetized and rapidly rotating white dwarf as small as the Moon
Kulkarni, S. R.; Duev, Dmitry A.; Burdge, Kevin B. +15 more
White dwarfs represent the last stage of evolution of stars with mass less than about eight times that of the Sun and, like other stars, are often found in binaries1,2. If the orbital period of the binary is short enough, energy losses from gravitational-wave radiation can shrink the orbit until the two white dwarfs come into contact an…
Spatially resolved star formation and inside-out quenching in the TNG50 simulation and 3D-HST observations
Mowla, Lamiya; van Dokkum, Pieter; Johnson, Benjamin D. +22 more
We compare the star-forming main sequence (SFMS) of galaxies - both integrated and resolved on 1 kpc scales - between the high-resolution TNG50 simulation of IllustrisTNG and observations from the 3D-HST slitless spectroscopic survey at z ~ 1. Contrasting integrated star formation rates (SFRs), we find that the slope and normalization of the star-…
A nearby galaxy perspective on dust evolution. Scaling relations and constraints on the dust build-up in galaxies with the DustPedia and DGS samples
De Looze, Ilse; Baes, Maarten; Fritz, Jacopo +13 more
Context. The efficiency of the different processes responsible for the evolution of interstellar dust on the scale of a galaxy are, to date, very uncertain, spanning several orders of magnitude in the literature. Yet, precise knowledge of the grain properties is key to addressing numerous open questions about the physics of the interstellar medium…
Oxia Planum: The Landing Site for the ExoMars "Rosalind Franklin" Rover Mission: Geological Context and Prelanding Interpretation
Pan, Lu; Quantin-Nataf, Cathy; Fawdon, Peter +18 more
The European Space Agency (ESA) and Roscosmos ExoMars mission will launch the "Rosalind Franklin" rover in 2022 for a landing on Mars in <uri xlink:href="http://2023.The">2023.The</uri> goals of the mission are to search for signs of past and present life on Mars, investigate the water/geochemical environment as a function of depth in …
Discovery and follow-up of ASASSN-19dj: an X-ray and UV luminous TDE in an extreme post-starburst galaxy
Kochanek, C. S.; Foley, R. J.; Stalder, B. +28 more
We present observations of ASASSN-19dj, a nearby tidal disruption event (TDE) discovered in the post-starburst galaxy KUG 0810+227 by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d ≃ 98 Mpc. We observed ASASSN-19dj from -21 to 392 d relative to peak ultraviolet (UV)/optical emission using high-cadence, multiwavelength spe…
The electron-capture origin of supernova 2018zd
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +27 more
In the transitional mass range (~8-10 solar masses) between white dwarf formation and iron core-collapse supernovae, stars are expected to produce an electron-capture supernova. Theoretically, these progenitors are thought to be super-asymptotic giant branch stars with a degenerate O + Ne + Mg core, and electron capture onto Ne and Mg nuclei shoul…
Photoevaporation versus core-powered mass-loss: model comparison with the 3D radius gap
Owen, James E.; Schlichting, Hilke E.; Rogers, James G. +1 more
The extreme ultraviolet (EUV)/X-ray photoevaporation and core-powered mass-loss models are both capable of reproducing the bimodality in the sizes of small, close-in exoplanets observed by the Kepler space mission, often referred to as the 'radius gap'. However, it is unclear which of these two mechanisms dominates the atmospheric mass-loss that i…