Collapse of Low Mass Clouds in the Presence of UV Radiation Field

Abstract

The collapse of marginally Jeans unstable primordial gas clouds in the presence of UV radiation field is discussed. Assuming that the dynamical collapse proceeds approximately in an isothermal self-similar fashion, we investigate the thermal evolution of collapsing central core until H${}_2$ cooling dominates photoheating and the temperature drops to below $10^4$K. Consequently, the mass of the cooled core is evaluated as $M_{cool}=3.6\times 10^6{M}_{\odot }(I_{21}/1{)}^{-0.32}$. This scale depends only on the incident UV intensity, and provides a lower limit to the mass of collapsed objects in the UV radiation field.

7 pages, 3 Figures, accepted for publication in MNRAS

References in corpus (4)

• The Radiative Feedback of the First Cosmological Objects
• Photodissociative Regulation of Star Formation in Metal-Free Pregalactic Clouds
• Formation of Sub-galactic Clouds under UV Background Radiation
• Formation and Disruption of Cosmological Low Mass Objects

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• Smoothed Particle Hydrodynamics coupled with Radiation Transfer
• The mass spectrum of metal-free Stars resulting from photodissociation feedback: A scenario for the formation of low-mass population III stars
• Effects of Early Cosmic Reionization on the Substructure Problem in Galactic Halo
• Photodissociation feedback of Population III stars \\on their neighbor prestellar cores
• Formation Criteria and the Mass of Secondary Population III Stars
• Detectable Signatures of Cosmic Radiative Feedback
• Regulated star formation in forming disk galaxies under ultraviolet radiation background
• Formation of globular clusters induced by external ultraviolet radiation