English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Comparison of observed satellite galaxies of the Milky Way (hereafter MW)with dark matter subhaloes in cosmological $N$-body simulations of MW-masshaloes suggest that such subhaloes, if they exist, are occupied by satellitesin a stochastic fashion. We examine how inefficient massive star formation andassociated supernova feedback in high-redshift progenitors of present-daylow-mass subhaloes might contribute to this stochasticity. Using a Monte Carloapproach to follow the assembly histories of present-day low-mass haloes with$10^7 \lesssim M \leq 10^{10}$ ${\rm M}_{\odot}$, we identify when cooling andstar formation is likely to proceed, and observe that haloes with present-daymasses $\lesssim 10^9 {\rm M}_{\odot}$ never grow sufficiently massive tosupport atomic hydrogen line cooling. Noting that the star formation timescaledecreases sharply with stellar mass as $t_{\rm PMS} \propto m_{\ast}^{-2.5}$,we argue that, should the conditions for high mass star formation arise inlow-mass haloes, the ensuing supernovae are likely to disrupt ongoinglower-mass star formation and unbind gas within the halo. This potentiallystar-forming gas is unlikely to be replenished in lower mass haloes because of,e.g. cosmological reionization, and so we expect galaxy formation to be stymiedin a manner that depends on host halo assembly history and the efficiency andtiming of star formation in proto-galaxies, which we illustrate using a MonteCarlo model. Based on these simple physical arguments, we assert thatstochasticity of star formation and feedback is an essential but overlookedingredient in modelling galaxy formation on the smallest scales.

Stochastic Star Formation & Feedback: Mapping Low-Mass Galaxies to Dark Matter Haloes