Expected dust grain-size distributions in galaxies detected by ALMA at z > 7

文化大學機構典藏 CCUR > 理工學院 > 理學院 > 光電物理系 > 期刊論文 > Item 987654321/45476

Please use this identifier to cite or link to this item: https://irlib.pccu.edu.tw/handle/987654321/45476

Title:	Expected dust grain-size distributions in galaxies detected by ALMA at z > 7
Authors:	Liu, HM (Liu, Hsin-Min) Hirashita, H (Hirashita, Hiroyuki)
Contributors:	光電物理系
Keywords:	dust, extinction galaxies: evolution galaxies high-redshift galaxies ISM galaxies star formation submillimetre: galaxies
Date:	2019-11
Issue Date:	2019-12-13 10:44:45 (UTC+8)
Abstract:	The dust properties in high-redshift galaxies provide clues to the origin of dust in the Universe. Although dust has been detected in galaxies at redshift z > 7, it is difficult to constrain the dominant dust sources only from the total dust amount. Thus, we calculate the evolution of grain-size distribution, expecting that different dust sources predict different grain-size distributions. Using the star formation time-scale and the total Baryonic mass constrained by the data in the literature, we calculate the evolution of grain-size distribution. To explain the total dust masses in ALMA-detected z > 7 galaxies, the following two solutions are possible: (i) high dust condensation efficiency in stellar ejecta and (ii) efficient accretion (dust growth by accreting the gas-phase metals in the interstellar medium). We find that these two scenarios predict significantly different grain-size distributions: in (i), the dust is dominated by large grains (a greater than or similar to 0.1 mu m, where a is the grain radius), while in (ii), the small-grain (a less than or similar to 0.01 mu m) abundance is significantly enhanced by accretion. Accordingly, extinction curves are expected to be much steeper in (ii) than in (i). Thus, we conclude that extinction curves provide a viable way to distinguish the dominant dust sources in the early phase of galaxy evolution.
Relation:	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 卷冊: 490 期: 1 頁數: 540-549
Appears in Collections:	[光電物理系] 期刊論文

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