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A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor
Geier, S.; Heber, U.; Irrgang, A. +8 more
Supernovae Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe. They are understood to result from a thermonuclear detonation in a white dwarf that formed from the exhausted core of a star more massive than the Sun. However, the possible progenitor channels leading …
Quenching of star formation from a lack of inflowing gas to galaxies
Richard, Johan; van Dokkum, Pieter G.; Mowla, Lamiya +16 more
Star formation in half of massive galaxies was quenched by the time the Universe was 3 billion years old1. Very low amounts of molecular gas seem to be responsible for this, at least in some cases2-7, although morphological gas stabilization, shock heating or activity associated with accretion onto a central supermassive blac…
The Gaia-ESO Survey: Galactic evolution of lithium from iDR6
Montes, D.; de Laverny, P.; Guiglion, G. +31 more
Context. After more than 50 years, astronomical research still struggles to reconstruct the history of lithium enrichment in the Galaxy and to establish the relative importance of the various 7Li sources in enriching the interstellar medium (ISM) with this fragile element.
Aims: To better trace the evolution of lithium in the Milky…
Understanding the Origins of Problem Geomagnetic Storms Associated with "Stealth" Coronal Mass Ejections
Rouillard, Alexis P.; Pagano, Paolo; Nitta, Nariaki V. +14 more
Geomagnetic storms are an important aspect of space weather and can result in significant impacts on space- and ground-based assets. The majority of strong storms are associated with the passage of interplanetary coronal mass ejections (ICMEs) in the near-Earth environment. In many cases, these ICMEs can be traced back unambiguously to a specific …
ALMA Lensing Cluster Survey: Bright [C II] 158 µm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719
Ono, Yoshiaki; Ouchi, Masami; Richard, Johan +31 more
We present bright [C II] 158 µm line detections from a strongly magnified and multiply imaged (µ ∼ 20-160) sub-L* ( ${M}_{\mathrm{UV}}=-{19.75}_{-0.44}^{+0.55}$ ) Lyman-break galaxy (LBG) at z = 6.0719 ± 0.0004, drawn from the ALMA Lensing Cluster Survey (ALCS). Emission lines are identified at 268.7 GHz at ≥8σ exactly at th…
The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations
Alves, João; Zucker, Catherine; Goodman, Alyssa +6 more
A major question in the field of star formation is how molecular clouds form out of the diffuse interstellar medium (ISM). Recent advances in 3D dust mapping are revolutionizing our view of the structure of the ISM. Using the highest-resolution 3D dust map to date, we explore the structure of a nearby star-forming region, which includes the well-k…
Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy
Zhao, Gang; Zhao, Jing-Kun; Li, Yaguang +19 more
Lithium has confused scientists for decades at almost every scale of the universe. Lithium-rich giants are peculiar stars with lithium abundances greater than model prediction. A large fraction of lithium-rich low-mass evolved stars are traditionally supposed to be red giant branch (RGB) stars. Recent studies, however, report that red clump (RC) s…
The VANDELS survey: The relation between the UV continuum slope and stellar metallicity in star-forming galaxies at z ∼ 3
Cimatti, A.; Schaerer, D.; Franco, M. +23 more
The estimate of stellar metallicities (Z*) of high-z galaxies are of paramount importance in order to understand the complexity of dust effects and the reciprocal interrelations among stellar mass, dust attenuation, stellar age, and metallicity. Benefiting from uniquely deep far-UV spectra of > 500 star-forming galaxies at redshifts …
Eridanus II: A Fossil from Reionization with an Off-center Star Cluster
Brown, Thomas M.; Strader, Jay; Geha, Marla +10 more
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of MV = -7.1, is located at a distance of 339 kpc, just beyond the virial radius of the Milky Way. We determine the star formation history of Eri II and measure the structure of the galaxy…
Correction to: X-Ray Properties of TDEs
Komossa, S.; Jonker, P. G.; Auchettl, K. +1 more
Observational astronomy of tidal disruption events (TDEs) began with the detection of X-ray flares from quiescent galaxies during the ROSAT all-sky survey of 1990-1991. The flares complied with theoretical expectations, having high peak luminosities (Lx up to ≥4 ×1044 erg/s), a thermal spectrum with k T ∼few ×105 K…