Affiliation:
1. CONACYT – Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51, 72000 Puebla, Mexico
2. Instituto Nacional de Astrofísica, Óptica y Electrónica, AP 51, 72000 Puebla, Mexico
Abstract
ABSTRACT
We present a novel scenario for the growth of dust grains in galaxies at high redshift (z ∼ 6). In our model, the mechanical feedback from massive star clusters evolving within high-density pre-enriched media allows to pile up a large amount of matter into massive supershells. If the gas metallicity (≥Z⊙), number density (≥106 cm−3), and dust-to-gas mass ratio (∼1/150 × Z) within the supershell are sufficiently large, such supershells may become optically thick to the starlight emerging from their host star clusters and even to radiation from the cosmic microwave background (CMB). Based on semi-analytic models, we argue that this mechanism, occurring in the case of massive (${\ge} 10^7\, {\rm M}_{\odot }$) molecular clouds hosting ${\ge} 10^6\, {\rm M}_{\odot }$ star clusters, allows a large mass of gas and dust to acquire a temperature below that of the CMB, whereupon dust grain growth may occur with ease. In galaxies with total stellar mass M*, grain growth within supershells may increase the dust mass by ${\sim} 10^6\, {\rm M}_{\odot } (M_{*}/10^{8}\, {\rm M}_{\odot })$.
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献