Evolution of effective dust extinction law of galaxies and its observational examination

星系有效尘埃消光定律的演化及其观测检验

• 批准号: 19740108
• 负责人: INOUE akio
• 金额: $ 2.03万
• 依托单位: Osaka Sangyo University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19740108/
• 关键词: 宇宙塵(ダスト); 輻射輸送; 銀河進化; 銀河間空間; 原始惑星系円盤; 宇宙再電離; 理論天文学; ダスト; 光電効果; モンテカルロ法; 化学進化; 原始惑星円盤; 氷ダスト; 宇宙塵(ダスト); 輻射輸送; 銀河進化; 銀河間空間; 原始惑星系円盤; 宇宙再電離; 理論天文学; ダスト; 光電効果; モンテカルロ法; 化学進化; 原始惑星円盤; 氷ダスト

Rapid developments of multi-wavelength electro-magnetic radiation observations by state-of-the-art instruments like Subaru telescope requested radiation transfer calculations to model spectra of various celestial objects. In particular, spectra of galaxies are suffering from extinction by cosmic dust which exists in the interstellar medium in galaxies. The main objectives of this research project were to obtain an effective dust extinction law to correct the spectra for the dust extinction and to obtain an evolution of the extinction law along galaxy evolution. However, unfortunately, I never reached these main goals because of a difficulty in the size distribution of dust grains. On the other hand, a newly developed galaxy evolution model and development and application of a general purpose code for radiation transfer enabled me to achieve the following four outcomes: (1) revealing mechanism to determine dust content in galaxies, (2) derivation of the photo-electric heating rate by intergalactic dust, (3) proposing a new spectral model of galaxies taking into account ionizing photon transfer in galaxies and intergalactic medium, and (4) revealing effects of scattering on structure of proto-planetary disks and proposing a technique to search icy dust by using a scattering spectral model.

由Subaru望远镜（如Subaru望远镜）诸如Subaru望远镜（要求的辐射转移计算）对各种天体对象的模型光谱进行的最新仪器（如Subaru望远镜）进行多波长电磁辐射观测的快速发展。特别是，星系的光谱遭受宇宙尘埃的灭绝，这些宇宙尘埃存在于星系中的星际介质中。该研究项目的主要目标是获得有效的尘埃灭绝法，以纠正粉尘灭绝的光谱，并沿银河进化的灭绝法进行演变。但是，不幸的是，由于灰尘谷物的尺寸分布困难，我从未达到这些主要目标。 On the other hand, a newly developed galaxy evolution model and development and application of a general purpose code for radiation transfer enabled me to achieve the following four outcomes: (1) revealing mechanism to determine dust content in galaxies, (2) derivation of the photo-electric heating rate by intergalactic dust, (3) proposing a new spectral model of galaxies taking into account ionizing photon transfer in galaxies and intergalactic medium, and （4）揭示散射对原始磁盘结构的影响，并提出一种通过使用散射光谱模型来搜索冰灰尘的技术。