A cosmological simulation with tidally compressive cluster formation and compact-object heating yields globular cluster populations consistent with observations.
Star formation thresholds and galaxy edges: why and where
3 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We study global star formation thresholds in the outer parts of galaxies by investigating the stability of disk galaxies embedded in dark halos. The disks are self-gravitating, contain metals and dust, and are exposed to UV radiation. We find that the critical surface density for the existence of a cold interstellar phase depends only weakly on the parameters of the model and coincides with the empirically derived surface density threshold for star formation. Furthermore, it is shown that the drop in the thermal velocity dispersion associated with the transition from the warm to the cold gas phase triggers gravitational instability on a wide range of scales. The presence of strong turbulence does not undermine this conclusion if the disk is self-gravitating. Models based on the hypothesis that the onset of thermal instability determines the star formation threshold in the outer parts of galaxies can reproduce many observations, including the threshold radii, column densities, and the sizes of stellar disks as a function of disk scale length and mass. Finally, prescriptions are given for implementing star formation thresholds in (semi-)analytic models and three-dimensional hydrodynamical simulations of galaxy formation.
years
2026 3representative citing papers
Bulgeless galaxies trace the upper envelope of the mass-R1 relation with scatter driven by central stellar density and the spatial configuration of mergers rather than their number.
A mission-proposal science book forecasting observational yields for a proposed JAXA 2–18 µm infrared space telescope; no new measurement or derivation is presented.
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Introducing AuriGLOBES: The effects of compressive tides, compact object-induced mass loss, and size evolution on modelling globular clusters
A cosmological simulation with tidally compressive cluster formation and compact-object heating yields globular cluster populations consistent with observations.
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Bulgeless Evolution And the Rise of Discs (BEARD) I. Physical drivers of the mass-size relation for Milky Way-like galaxies
Bulgeless galaxies trace the upper envelope of the mass-R1 relation with scatter driven by central stellar density and the spatial configuration of mergers rather than their number.
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GREX-PLUS Science Book v2
A mission-proposal science book forecasting observational yields for a proposed JAXA 2–18 µm infrared space telescope; no new measurement or derivation is presented.