First light for GRAVITY Wide
Astronomy & Astrophysics EDP Sciences 665 (2022) a75
Kiloparsec view of a typical star-forming galaxy when the Universe was ∼1 Gyr old
Astronomy & Astrophysics EDP Sciences 665 (2022) l8
EAS 2022 takes positive steps forward for sustainable astronomy
Nature Astronomy Springer Nature 6:7 (2022) 765-765
The SAMI Galaxy Survey: the link between [α/Fe] and kinematic morphology
Monthly Notices of the Royal Astronomical Society Oxford University Press 513:4 (2022) 5076-5087
Abstract:
We explore a sample of 1492 galaxies with measurements of the mean stellar population properties and the spin parameter proxy, λRe, drawn from the SAMI Galaxy Survey. We fit a global [α/Fe]–σ relation, finding that [α/Fe]=(0.395±0.010)log10(σ)−(0.627±0.002). We observe an anti-correlation between the residuals Δ[α/Fe] and the inclination-corrected λeoRe, which can be expressed as Δ[α/Fe]=(−0.057±0.008)λeoRe+(0.020±0.003). The anti-correlation appears to be driven by star-forming galaxies, with a gradient of Δ[α/Fe]∼(−0.121±0.015)λeoRe, although a weak relationship persists for the subsample of galaxies for which star formation has been quenched. We take this to be confirmation that disc-dominated galaxies have an extended duration of star formation. At a reference velocity dispersion of 200 km s−1, we estimate an increase in half-mass formation time from ∼0.5 Gyr to ∼1.2 Gyr from low- to high-λeoRe galaxies. Slow rotators do not appear to fit these trends. Their residual α-enhancement is indistinguishable from other galaxies with λeoRe⪅0.4, despite being both larger and more massive. This result shows that galaxies with λeoRe⪅0.4 experience a similar range of star formation histories, despite their different physical structure and angular momentum.The SAMI Galaxy Survey: The Internal Orbital Structure and Mass Distribution of Passive Galaxies from Triaxial Orbit-superposition Schwarzschild Models
The Astrophysical Journal American Astronomical Society 930:2 (2022) 153