Effects of rotational disruption on the evolution of grain size distribution in galaxies

被引:7
作者
Hirashita, Hiroyuki [1 ]
Hoang, Thiem [2 ,3 ]
机构
[1] Acad Sinica, Inst Astron & Astrophys, AS NTU, Astron Math Bldg,1,Sect 4,Roosevelt Rd, Taipei 10617, Taiwan
[2] Korea Astron & Space Sci Inst, Daejeon 34055, South Korea
[3] Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea
基金
新加坡国家研究基金会;
关键词
dust; extinction; galaxies: evolution; galaxies: high-redshift; galaxies: ISM; galaxies: starburst; INTERSTELLAR DUST; RADIATIVE TORQUES; MILKY-WAY; ABUNDANCE; EXTINCTION; SIMULATION; COLLISIONS; ALIGNMENT; EMISSION; SHOCKS;
D O I
10.1093/mnras/staa793
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Interstellar dust grains can be spun up by radiative torques, and the resulting centrifugal force may be strong enough to disrupt large dust grains. We examine the effect of this rotational disruption on the evolution of grain size distribution in galaxies. To this goal, we modify our previous model by assuming that rotational disruption is the major small-grain production mechanism. We find that rotational disruption can have a large influence on the evolution of grain size distribution in the following two aspects especially for composites and grain mantles (with tensile strength similar to 10(7) erg cm(-3)). First, because of the short time-scale of rotational disruption, the small-grain production occurs even in the early phase of galaxy evolution. Therefore, even though stars produce large grains, the abundance of small grains can be large enough to steepen the extinction curve. Secondly, rotational disruption is important in determining the maximum grain radius, which regulates the steepness of the extinction curve. For compact grains with tensile strength greater than or similar to 10(9) erg cm(-3), the size evolution is significantly affected by rotational disruption only if the radiation field is as strong as (or the dust temperature is as high as) expected for starburst galaxies. For compact grains, rotational disruption predicts that the maximum grain radius becomes less than 0.2 mu m for galaxies with a dust temperature greater than or similar to 50 K.
引用
收藏
页码:1058 / 1070
页数:13
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