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The dark matter interpretation of the 3.5-keV line is inconsistent with blank-sky observations
Safdi, Benjamin R.; Dessert, Christopher; Rodd, Nicholas L.
Observations of nearby galaxies and galaxy clusters have reported an unexpected x-ray emission line around 3.5 kilo-electron volts (keV). Proposals to explain this line include decaying dark matter—in particular, that the decay of sterile neutrinos with a mass around 7 keV could match the available data. If this interpretation is correct, the 3.5-…
A naked-eye triple system with a nonaccreting black hole in the inner binary
Rivinius, Th.; Baade, D.; Klement, R. +2 more
Several dozen optical echelle spectra demonstrate that
NIHAO-UHD: the properties of MW-like stellar discs in high-resolution cosmological simulations
Ostriker, Jeremiah P.; Buck, Tobias; Minchev, Ivan +3 more
Simulating thin and extended galactic discs has long been a challenge in computational astrophysics. We introduce the NIHAO-UHD suite of cosmological hydrodynamical simulations of Milky Way (MW) mass galaxies and study stellar disc properties such as stellar mass, size, and rotation velocity which agree well with observations of the MW and local g…
Quenching as a Contest between Galaxy Halos and Their Central Black Holes
Barro, Guillermo; Bell, Eric F.; Ferguson, Henry C. +27 more
Existing models of galaxy formation have not yet explained striking correlations between structure and star formation activity in galaxies, notably the sloped and moving boundaries that divide star-forming from quenched galaxies in key structural diagrams. This paper uses these and other relations to "reverse engineer" the quenching process for ce…
Observational constraints on the optical and near-infrared emission from the neutron star-black hole binary merger candidate S190814bv
Covino, S.; D'Avanzo, P.; Campana, S. +151 more
Context. Gravitational wave (GW) astronomy has rapidly reached maturity, becoming a fundamental observing window for modern astrophysics. The coalescences of a few tens of black hole (BH) binaries have been detected, while the number of events possibly including a neutron star (NS) is still limited to a few. On 2019 August 14, the LIGO and Virgo i…
The origin of the escape of Lyman α and ionizing photons in Lyman continuum emitters
Chisholm, J.; Schaerer, D.; Verhamme, A. +2 more
Context. Identifying the physical mechanisms driving the escape of Lyman continuum (LyC) photons is crucial for the search of Lyman continuum emitter (LCE) candidates.
Aims: To understand the physical properties involved in the leakage of LyC photons, we investigate the connection between the H I covering fraction, H I velocity width, the Lym…
Discovery of a nearby 1700 km s-1 star ejected from the Milky Way by Sgr A*
Lewis, Geraint F.; Boubert, Douglas; Erkal, Denis +18 more
We present the serendipitous discovery of the fastest main-sequence hyper-velocity star (HVS) by the Southern Stellar Stream Spectroscopic Survey (S5). The star S5-HVS1 is a ∼2.35 M⊙ A-type star located at a distance of ∼9 kpc from the Sun and has a heliocentric radial velocity of 1017 ± 2.7 km s^{-1} without any signature of…
A remnant planetary core in the hot-Neptune desert
Latham, David W.; Gandhi, Siddharth; Brogi, Matteo +92 more
The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to large uncertainties in the properties of planetary cores. Exoplanets that have undergone rare evolutionary processes provide a route to understanding planetary interiors. Planets found in and near the typically bar…
Dynamical traceback age of the β Pictoris moving group
Miret-Roig, N.; Bouy, H.; Figueras, F. +7 more
Context. The β Pictoris moving group is one of the most well-known young associations in the solar neighbourhood and several members are known to host circumstellar discs, planets, and comets. Measuring its age precisely is essential to the study of several astrophysical processes, such as planet formation and disc evolution, which are strongly ag…
Is HR 6819 a triple system containing a black hole?. An alternative explanation
Shenar, T.; Sana, H.; Hawcroft, C. +10 more
Context. HR 6819 was recently proposed to be a triple system consisting of an inner B-type giant plus black hole (BH) binary with an orbital period of 40 d and an outer Be tertiary. This interpretation is mainly based on two inferences: that the emission attributed to the outer Be star is stationary and that the inner star, which is used as mass c…