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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…
Validation of the Gaia Early Data Release 3 Parallax Zero-point Model with Asteroseismology
Zinn, Joel C.
Gaia Early Data Release 3 (EDR3) provides trigonometric parallaxes for 1.5 billion stars, with reduced systematics compared to Gaia Data Release 2 and reported precisions better by up to a factor of 2. New to EDR3 is a tentative model for correcting the parallaxes of magnitude-, position-, and color-dependent systematics for five- and six-paramete…
Elevated r-process Enrichment in Gaia Sausage and Sequoia
Myeong, G. C.; Kobayashi, Chiaki; Belokurov, Vasily +6 more
The Gaia Sausage (GS) and the Sequoia represent the major accretion events that formed the stellar halo of the Milky Way. A detailed chemical study of these main building blocks provides a pristine view of the early steps of the Galaxy's assembly. We present the results of the analysis of the UVES high-resolution spectroscopic observations at the …
Solar force-free magnetic fields
Wiegelmann, Thomas; Sakurai, Takashi
The structure and dynamics of the solar corona is dominated by the magnetic field. In most areas in the corona magnetic forces are so dominant that all non-magnetic forces such as plasma pressure gradients and gravity can be neglected in the lowest order. This model assumption is called the force-free field assumption, as the Lorentz force vanishe…
Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
Monachesi, Antonela; Drout, Maria R.; Kollmeier, Juna A. +43 more
APOGEE is a high-resolution (R ~ 22,000), near-infrared, multi-epoch, spectroscopic survey of the Milky Way. The second generation of the APOGEE project, APOGEE-2, includes an expansion of the survey to the Southern Hemisphere called APOGEE-2S. This expansion enabled APOGEE to perform a fully panoramic mapping of all of the main regions of the Mil…
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…
Exploiting the Gaia EDR3 photometry to derive stellar temperatures
Massari, D.; Bellazzini, M.; Mucciarelli, A.
We present new colour-effective temperature (Teff) transformations based on the photometry of the early third data release (EDR3) of the ESA/Gaia mission. These relations are calibrated on a sample of about 600 dwarf and giant stars for which Teff has previously been determined with the infrared flux method from dereddened co…
The MUSE Extremely Deep Field: The cosmic web in emission at high redshift
Feltre, A.; Roth, M.; Steinmetz, M. +29 more
We report the discovery of diffuse extended Lyα emission from redshift 3.1 to 4.5, tracing cosmic web filaments on scales of 2.5−4 cMpc. These structures have been observed in overdensities of Lyα emitters in the MUSE Extremely Deep Field, a 140 h deep MUSE observation located in the Hubble Ultra-Deep Field. Among the 22 overdense regions identifi…
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…