arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.4207astro-ph.CO
收藏

星系中尘埃对辐射的处理

The processing of radiation by dust in galaxies

Ralf Siebenmorgen, Frank Heymann

摘要:

星系中的光学/紫外光子和更硬的辐射成分被尘埃吸收和散射,并以红外波长重新发射。为了更好地理解星系中被遮蔽的区域,需要有关于光子与尘埃颗粒相互作用以及光传播的详细模型。一个只能通过数值解辐射转移方程来解决的问题。作为一个序幕,我们提出了高角度的中红外观测星系核的精神,未来的ELT仪器。讨论了适合于拟合消光曲线和计算外星系辐射的尘埃模型。自洽的辐射转移模型已经提出了球对称的星暴核,在两个维度的盘星系(螺旋),最近,在三维配置的尘埃密度分布。对于后者,一个突出的例子是活动星系核周围的星团尘埃环。该领域的现代进展进行审查,这是基于更详细的物理图片或计算科学的进展。

英文摘要:

Optical/UV photons and even harder radiation components in galaxies are absorbed and scattered by dust and re-emitted at infrared wavelengths. For a better understanding of the obscured regions of the galaxies detailed models of the interaction of photons with dust grains and the propagation of light are required. A problem which can only be solved by means of numerical solution of the radiative transfer equation. As a prologue we present high angular mid IR observations of galactic nuclei in the spirit of future ELT instrumentation. Dust models are discussed, which are suited to fit the extinction curves and relevant to compute the emission of external galaxies. Self-consistent radiative transfer models have been presented in spherical symmetry for starburst nuclei, in two dimensions for disk galaxies (spirals) and, more recently, in three dimensional configuration of the dust density distribution. For the latter, a highlighting example is the clumpy dust tori around AGN. Modern advances in the field are reviewed which are either based on a more detailed physical picture or progress in computational sciences.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑