Suppression of globular cluster formation in metal-poor gas clouds by Lyman-alpha radiation feedback

Abstract

We study the impact of Ly$\alpha$ radiation feedback on globular cluster (GC) formation. In this Letter, we analytically derive the relation between star formation efficiency (SFE) and metallicity in spherical clouds with the Ly$\alpha$ radiation feedback. Our models show that the SFE becomes small as the metallicity decreases. In metal-poor gas clouds, Ly$\alpha$ photons are trapped for a long time and exert strong radiation force to the gas, resulting in the suppression of star formation. We find that bound star-clusters (SFE $\gtrsim$ 0.5) form only for the metallicity higher than $\sim 10^{-2.5}{Z}_{\odot }$ in the case with the initial cloud mass $10^5{\mathrm{M}}_{\odot }$ and the radius 5 pc. Our models successfully reproduce the lower bound of observed metallicity of GCs. Thus, we suggest that the Ly$\alpha$ radiation feedback can be essential in understanding the formation of GCs.

5 pages, 3 figures, accepted for publication in MNRAS Letter

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Cited by in corpus (6)

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• The formation of globular clusters with top-heavy initial mass functions
• Impact of Radiation Feedback on the Formation of Globular Cluster Candidates during Cloud-Cloud Collisions
• Does radiative feedback make faint z>6 galaxies look small?
• Lyman-$\alpha$ radiation pressure regulates star formation efficiency