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QAUNTITATIVE STUDY OF MID-INFRARED SPECTRA AND MID-INFRARED HYDROCARBON BANDS OF EXTERNAL GALAXIES

星系外中红外光谱和中红外碳氢化合物谱带的定量研究

基本信息

批准号：
11440062
负责人：
ONAKA Takashi
金额：
$ 8.7万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440062/
关键词：
SPECTRSCOPY INFRARED SPACE RESEARCH INTERSTELLAR ORGANICS STAR FORMATION EXTERNAL GALAXIES PHOTOELECTRIC HEATING

项目摘要

We have analyzed the data taken by IRTS and ISO for the Galactic plane and found that the mid-infrared organic bands do not change their band ratios with the strength of incident radiation field. This result indicates that the interstellar organics are fully ionized contrary to the model predictions. We also found a broad band feature around 22 micron in the Carina data. A similar band is also detected in a supernova remnant and in an external galaxy. We suggest that (1) the 22 micron band carriers may be formed in supernova explosion, (2) it can be used an index for recent star formation activities, and (3) it could affect wide-band photometry. Based on the far-infrared spectroscopy of external galaxies, we found that the gas density increases with the activity and that the far-infrared characteristics do not change with the galaxy morphology. Analysis of infrared camera data indicates that (1) the total 7 micron to 15 micron mid-infrared color is determined by the color of the nucleus for most galaxies, (2) the color decreases for barred galaxies, but (3) there are some galaxies which show low ratios in the extended region, suggesting that the mid-infrared color indicates short-lived activities in galaxies. Investigations of the spectral energy distribution (SED) from mid-infrared to far-infrared further suggest that the SED of the Galactic plane and external galaxies can be accounted for consistently if we use an empirical SED of the Galactic plane. We have established a model that accounts for the mid-infrared characteristics, including the mid-infrared bands, and have achieved the primary goal of this project.

我们分析了IRTS和ISO的银道面观测数据，发现中红外有机物波段的带比不随入射辐射场的强度而改变。这一结果表明星际有机物已完全电离，与模型预测相反。我们还在Carina数据中发现了约22微米的宽带特征。在超新星遗迹和外部星系中也发现了类似的带。我们认为：（1）22微米波段的载流子可能是超新星爆发时形成的，（2）它可以作为近期星星形成活动的一个指标，（3）它可能影响宽波段测光。通过对星系外远红外光谱的研究，发现星系外气体密度随星系活动的增加而增加，而远红外特征不随星系形态的变化而改变。对红外相机数据的分析表明：（1）大多数星系的7微米到15微米的中红外颜色是由星系核的颜色决定的，（2）棒星系的颜色减少，但（3）有些星系在扩展区域显示出低的比例，这表明中红外颜色表明星系中的短寿命活动。从中红外到远红外的光谱能量分布（SED）的调查进一步表明，SED的银河系平面和外部星系可以占一致，如果我们使用的经验SED的银河系平面。我们已经建立了一个模型，占中红外特性，包括中红外波段，并实现了本项目的主要目标。