当前位置: X-MOL 学术Adv. Space Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Impacts of the PAH size and the radiation intensity on the IR features of illuminated dust within the reflection nebulae
Advances in Space Research ( IF 2.6 ) Pub Date : 2021-03-26 , DOI: 10.1016/j.asr.2021.02.025
Kamel A.K. Gadallah , Abdallah A.M. Ali

Interstellar dust grains are illuminated in the reflection nebulae. Under conditions of the PAH size and the intensity of the interstellar radiation field, we follow their impact on the PAH aromatic infrared bands using the numerical DustEM code. For a dust model consisting of PAH, amorphous C and amorphous silicate, the PAH size varies in a range from 0.31 to 4.9 nm while the radiation intensity varies by a scale factor from 0.1 to 104. Various trends of the results show the effect of varying both the PAH size and the radiation intensity on the strength of the aromatic mid-IR bands. Through small PAH sizes less than 0.7 nm, the grain temperature distribution of PAHs shows a small variation within 2–3 K at low radiation intensity while it increases to 15 and 8 K for PAH0 and PAH+, respectively, at higher radiation intensity. In final the variability in these results reveals the evolution of the dust grains under the physical space conditions of the reflection nebulae. In the mid-IR region, the contributions of PAH0 and PAH+ in the total SED intensity agree with the proportions of these PAHs observed in some reflection nebulae having higher radiation intensities.



中文翻译:

PAH大小和辐射强度对反射星云中照明尘埃的红外特性的影响

星际尘埃颗粒在反射星云中被照亮。在PAH大小和星际辐射场强度的条件下,我们使用数字 DustEM代码跟踪它们对PAH芳族红外波段的影响。对于由PAH,无定形C和无定形硅酸盐组成的粉尘模型,PAH尺寸在0.31至4.9 nm的范围内变化,而辐射强度的比例因子在0.1至10 4的范围内变化。结果的各种趋势表明,改变PAH大小和辐射强度对芳族中红外波段强度的影响。通过小于0.7 nm的小PAH尺寸,PAH的晶粒温度分布在低辐射强度下在2–3 K内显示出很小的变化,而对于PAH 0则增加到15和8 K和PAH +分别在较高的辐射强度下。最后,这些结果的变异性揭示了在反射星云的物理空间条件下尘埃颗粒的演化。在中红外区域,PAH 0和PAH +在总SED强度中的贡献与在某些具有较高辐射强度的反射星云中观察到的这些PAH的比例一致。

更新日期:2021-05-07
down
wechat
bug