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The Hi-GAL compact source catalogue - II. The 360° catalogue of clump physical properties
Martin, P. G.; Paladini, R.; Pilbratt, G. L. +29 more
We present the 360° catalogue of physical properties of Hi-GAL compact sources, detected between 70 and 500 $\mu$m. This release not only completes the analogous catalogue previously produced by the Hi-GAL collaboration for -71° ≲ ℓ ≲ 67°, but also meaningfully improves it because of a new set of heliocentric distances, 120 808 in total. About a t…
Extending the evolution of the stellar mass-size relation at z ≤ 2 to low stellar mass galaxies from HFF and CANDELS
Ferguson, Henry C.; Kartaltepe, Jeyhan S.; Martis, Nicholas S. +23 more
We reliably extend the stellar mass-size relation over 0.2 ≤ z ≤ 2 to low stellar mass galaxies by combining the depth of Hubble Frontier Fields with the large volume covered by CANDELS. Galaxies are simultaneously modelled in multiple bands using the tools developed by the MegaMorph project, allowing robust size (i.e. half-light radius) estimates…
The mass of the Milky Way out to 100 kpc using halo stars
Zhao, Gang; Grand, Robert J. J.; Gómez, Facundo A. +9 more
We use a distribution function analysis to estimate the mass of the Milky Way (MW) out to 100 kpc using a large sample of halo stars. These stars are compiled from the literature, and the vast majority ( ${\sim } 98{{\ \rm per\ cent}}$ ) have 6D phase-space information. We pay particular attention to systematic effects, such as the dynamical influ…
MMT spectroscopy of Lyman-alpha at z ≃ 7: evidence for accelerated reionization around massive galaxies
Charlot, Stéphane; Chevallard, Jacopo; Bouwens, Rychard J. +4 more
Reionization-era galaxies tend to exhibit weak Ly α emission, likely reflecting attenuation from an increasingly neutral IGM. Recent observations have begun to reveal exceptions to this picture, with strong Ly α emission now known in four of the most massive z = 7-9 galaxies in the CANDELS fields, all of which also exhibit intense [O III]+H β emis…
Dynamical dark energy after Planck CMB final release and H0 tension
Di Valentino, Eleonora; Yang, Weiqiang; Wu, Yabo +2 more
In this article we compare a variety of well-known dynamical dark energy models using the cosmic microwave background measurements from the 2018 Planck legacy and 2015 Planck data releases, the baryon acoustic oscillations measurements and the local measurements of H0 obtained by the SH0ES (Supernovae, H0, for the Equation of…
Stellar migration and chemical enrichment in the milky way disc: a hybrid model
Quinn, Thomas R.; Weinberg, David H.; Christensen, Charlotte R. +6 more
We develop a hybrid model of galactic chemical evolution that combines a multiring computation of chemical enrichment with a prescription for stellar migration and the vertical distribution of stellar populations informed by a cosmological hydrodynamic disc galaxy simulation. Our fiducial model adopts empirically motivated forms of the star format…
Cloud busting: enstatite and quartz clouds in the atmosphere of 2M2224-0158
Gonzales, Eileen C.; Marley, Mark S.; Faherty, Jacqueline K. +7 more
We present the most detailed data-driven exploration of cloud opacity in a substellar object to-date. We have tested over 60 combinations of cloud composition and structure, particle-size distribution, scattering model, and gas phase composition assumptions against archival 1-15 µm spectroscopy for the unusually red L4.5 dwarf 2MASSW J222443…
Interacting dark energy in a closed universe
Di Valentino, Eleonora; Melchiorri, Alessandro; Mena, Olga +2 more
Recent measurements of the Cosmic Microwave Anisotropies power spectra measured by the Planck satellite show a preference for a closed universe at more than $99 {{\ \rm per\ cent}}$ confidence level (CL). Such a scenario is however in disagreement with several low redshift observables, including luminosity distances of Type Ia supernovae. Here we …
Fundamental relations for the velocity dispersion of stars in the Milky Way
Lewis, Geraint F.; Ting, Yuan-Sen; Huber, Daniel +35 more
We explore the fundamental relations governing the radial and vertical velocity dispersions of stars in the Milky Way, from combined studies of complementary surveys including GALAH, LAMOST, APOGEE, the NASA Kepler and K2 missions, and Gaia DR2. We find that different stellar samples, even though they target different tracer populations and employ…
Solar oxygen abundance
Carlsson, Mats; Reiners, Ansgar; Bergemann, Maria +10 more
Motivated by the controversy over the surface metallicity of the Sun, we present a re-analysis of the solar photospheric oxygen (O) abundance. New atomic models of O and Ni are used to perform non-local thermodynamic equilibrium (NLTE) calculations with 1D hydrostatic (MARCS) and 3D hydrodynamical (Stagger and Bifrost) models. The Bifrost 3D MHD s…