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The diversity and variability of star formation histories in models of galaxy evolution
Somerville, Rachel S.; Genel, Shy; Hernquist, Lars +10 more
Understanding the variability of galaxy star formation histories (SFHs) across a range of time-scales provides insight into the underlying physical processes that regulate star formation within galaxies. We compile the SFHs of galaxies at z = 0 from an extensive set of models, ranging from cosmological hydrodynamical simulations (Illustris, Illust…
The Next Generation Virgo Cluster Survey (NGVS). XXX. Ultra-diffuse Galaxies and Their Globular Cluster Systems
Liu, Chengze; Cuillandre, Jean-Charles; Gwyn, S. D. J. +14 more
We present a study of ultra-diffuse galaxies (UDGs) in the Virgo Cluster based on deep imaging from the Next Generation Virgo Cluster Survey. Applying a new definition for the UDG class based on galaxy scaling relations, we define samples of 44 and 26 UDGs using expansive and restrictive selection criteria, respectively. Our UDG sample includes ob…
Driving classical Wolf-Rayet winds: a Γ- and Z-dependent mass-loss
Hamann, W. -R.; Vink, J. S.; Sander, Andreas A. C.
Classical Wolf-Rayet (cWR) stars are at a crucial evolutionary stage for constraining the fates of massive stars. The feedback of these hot, hydrogen-depleted stars dominates their surrounding by tremendous injections of ionizing radiation and kinetic energy. The strength of a Wolf-Rayet (WR) wind decides the eventual mass of its remnant, likely a…
Variability of OB stars from TESS southern Sectors 1-13 and high-resolution IACOB and OWN spectroscopy
Simón-Díaz, S.; Aerts, C.; Castro, N. +6 more
Context. The lack of high-precision long-term continuous photometric data for large samples of stars has impeded the large-scale exploration of pulsational variability in the OB star regime. As a result, the candidates for in-depth asteroseismic modelling have remained limited to a few dozen dwarfs. The TESS nominal space mission has surveyed the …
Thermal luminosities of cooling neutron stars
Zyuzin, D. A.; Shibanov, Yu A.; Potekhin, A. Y. +2 more
Ages and thermal luminosities of neutron stars, inferred from observations, can be interpreted with the aid of the neutron star cooling theory to gain information on the properties of superdense matter in neutron-star interiors. We present a survey of estimated ages, surface temperatures, and thermal luminosities of middle-aged neutron stars with …
The SkyMapper-Gaia RVS view of the Gaia-Enceladus-Sausage - an investigation of the metallicity and mass of the Milky Way's last major merger
Feuillet, Diane K.; Casagrande, Luca; Feltzing, Sofia +1 more
We characterize the Gaia-Enceladus-Sausage kinematic structure recently discovered in the Galactic halo using photometric metallicities from the SkyMapper survey, and kinematics from Gaia radial velocities measurements. By examining the metallicity distribution functions (MDFs) of stars binned in kinematic/action spaces, we find that the $\sqrt{J_…
Cosmicflows-4: The Calibration of Optical and Infrared Tully-Fisher Relations
Seibert, Mark; Anand, Gagandeep S.; Tully, R. Brent +5 more
This study is a part of the Cosmicflows-4 project with the aim of measuring the distances of more than ∼10,000 spiral galaxies in the local universe up to ∼15,000 $\mathrm{km}\,{{\rm{s}}}^{-1}$ . New H I line width information has come primarily from the Arecibo Legacy Fast ALFA Survey. Photometry of our sample galaxies has been carried out in opt…
The Evolution of Dust Disk Sizes from a Homogeneous Analysis of 1-10 Myr old Stars
Pascucci, Ilaria; Testi, Leonardo; Pinilla, Paola +4 more
We utilize ALMA archival data to estimate the dust disk size of 152 protoplanetary disks in Lupus (1-3 Myr), Chamaeleon I (2-3 Myr), and Upper-Sco (5-11 Myr). We combine our sample with 47 disks from Tau/Aur and Oph whose dust disk radii were estimated, as here, through fitting radial profile models to visibility data. We use these 199 homogeneous…
Missing [C II] emission from early galaxies
Maiolino, R.; Castellano, M.; Pentericci, L. +9 more
ALMA observations have revealed that [C II] 158 µm line emission in high-z galaxies is ≈2-3 × more extended than the UV continuum emission. Here we explore whether surface brightness dimming (SBD) of the [C II] line is responsible for the reported [C II] deficit, and the large $L_{\rm [O\, \small {III}]}/L_{\rm [C\, \small {II}]}$ luminosity…
Atmospheric Escape Processes and Planetary Atmospheric Evolution
Simon Wedlund, C.; Maggiolo, R.; Cessateur, G. +17 more
The habitability of the surface of any planet is determined by a complex evolution of its interior, surface, and atmosphere. The electromagnetic and particle radiation of stars drive thermal, chemical, and physical alteration of planetary atmospheres, including escape. Many known extrasolar planets experience vastly different stellar environments …