Processing of nano dust particles in galaxies
Processing of nano dust particles in galaxies
复制标题
星系中纳米尘埃颗粒的处理
DOI：
10.1017/s1743921319004873
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
and T. L. Roellig
中科院分区：
文献类型：
--
作者：
T. Onaka;T. Nakamura;I. Sakon;R. Ohsawa;R. Wu;H. Kaneda;V. Lebouteille;and T. L. Roellig
A family of emission bands observed in the near-to mid-infrared are attributed to the emission from nano-sized dust containing polycyclic aromatic hydrocarbons (PAHs) or PAH-like atomic groups. Investigations of variations of the emission bands (hereafter PAH emission) in violent conditions are thus significant for the study of the processing of nano-sized dust particles. Infrared observations of the Infrared Camera (IRC) on board AKARI (Onaka et al. 2007) have clearly shown that the PAH emission is detected in an Hα filament produced by winds from super star clusters in the nearby starburst dwarf galaxy NGC 1569 (Onaka et al. 2010). Recent analysis of IRC observations of two merger galaxies, NGC 2782 and NGC 7727, also shows that the PAH emission is prominently seen in extended structures produced by merger events (Fig. 1 a, Onaka et al. 2018). The midinfrared spectral energy distribution (SED) of the extended structures in both galaxies shows a sharp decline at 24 im, which cannot be accounted for even if the contribution from very small grains (VSGs) is removed (Fig. 1 b). These results suggest nano-sized (a)(b)
