Impact of grain size distributions on the dust enrichment in high-redshift quasars

摘要: In high-redshift (z > 5) quasars, a large amount of dust (∼108 M⊙) has been observed. order to explain the content, we focus on possibility that grain growth by accretion heavy elements is dominant source. We adopt chemical evolution model applicable nearby galaxies, but utilize parameters adequate high-z quasars. It assumed metals and are predominantly ejected Type II supernovae (SNe). have found strongly depends size distribution. If simply use distribution grains from SNe, inefficient because lack small (i.e. surface-to-volume ratio grains). However, if take production interstellar shattering into consideration, efficient enough account for rich abundance in Our results not only confirm necessary also demonstrate distributions critical impact growth.