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.

我们已经分析了IRTS和ISO为银河平面采集的数据，并发现中红外有机带不会随着入射辐射场的强度改变其带比。该结果表明星际有机物与模型预测完全离子化。我们还发现了Carina数据中22微米的宽带特征。在超新星残留物和外部星系中也检测到了类似的条带。我们建议（1）22微米带载体可以在超新星爆炸中形成，（2）它可以用于近期恒星形成活动的索引，（3）可能会影响宽频段的光度法。基于外部星系的远红外光谱，我们发现气体密度随着活性而增加，并且远红外特征不会随星系形态而变化。红外摄像头数据的分析表明，（1）总计7微米至15微米的中红外颜色取决于大多数星系的细胞核的颜色，（2）（2）禁止星系的颜色降低，但（3）有些星系在扩展区域中显示出较低的比例，表明中型颜色表明在星系中表现出短暂的星际活动。对从中红外到远红外的光谱能分布（SED）的研究进一步表明，如果我们使用银河平面的经验SED，可以始终如一地考虑银河平面和外部星系的SED。我们已经建立了一个模型，该模型说明了中国的特征，包括中红外乐队，并实现了该项目的主要目标。