摘要
本文讨论了16个红外强PG类星体的红外辐射能谱。我们假设这些活动星系核的红外谱是由非热辐射机制和尘埃的热辐射共同产生的,通过对红外包的最佳拟合,我们发现大多数PG类星体的红外包位于7一24μ的中远红外区,尘埃的热辐射机制能很好地产生观测到的红外包。通过模拟能定量地说明尘埃产生的热致辐射在这些天体的红外谱中的相对重要性,在模型与观测值之间的拟合中,我们得到了在这些天体中核加热的尘埃区的大小、尘埃的分布等模型参数。
In this paper,we study the IR spectral energy distribution of 16 PG quasars which have strong infrared radiation. We suppose that nonthermal radiative process and thermal radiation of dust existing in AGNs produce the observational infrared spectrum. In the best fits, we find the infrared bumps of most PG quasars sleep in middle and far infrared zone. The thermal re-radiation of dust grains existing in AGNs can exactly explain the observational bumps.From this study, we can say:both thermal dust emission and nonthermal power law mechanism contribute to different relative amounts in different objects. In this study, we also give the parameters about distribution of dust grains in AGNs.
出处
《天文学报》
CSCD
北大核心
1995年第3期237-244,共8页
Acta Astronomica Sinica
基金
广东省自然科学基金
华南师大重点教师基金
关键词
星系核
辐射机制
红外能谱
多波段能谱
Galactic nucleus, Radiative mechanism, Infrared spectrum