| DC 欄位 |
值 |
語言 |
| DC.contributor | 天文研究所 | zh_TW |
| DC.creator | 陳以忱 | zh_TW |
| DC.creator | I-Chenn Chen | en_US |
| dc.date.accessioned | 2007-7-18T07:39:07Z | |
| dc.date.available | 2007-7-18T07:39:07Z | |
| dc.date.issued | 2007 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=942209011 | |
| dc.contributor.department | 天文研究所 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 我們利用鹿林一米望遠鏡(LOT)拍攝了三個螺旋星系，M51、M83和M101的Hα影像；接著我們將這些影像和近紅外波段－2MASS的Ks影像做比較。這麼做的原因是為了要比較在星系的旋臂上，和旋臂間的空隙區域的Hα/K的比值。我們發現，在旋臂上，Hα/K的比值的確比在旋臂間的空隙區域來的高；由於Ks波段影像代表的是的星系中密度波的分佈，也就是說，在密度波分佈的區域，有較高的恆星形成率。另外，我們也發現了恆星形成區域(HII區域)大部分分佈在星系密度波分佈區域的前緣。上述兩個結果都暗示著，在我們所觀測的星系中，密度波是激發恆星形成的主要機制。 | zh_TW |
| dc.description.abstract | We have obtained Hαimages of three nearby face-on galaxies, M51, M83 and M101, by using the Lulin One-meter Telescope (LOT). We then compared these images to the near-infrared Ks band data which is obtained from the 2MASS catalog, in order to determine the Hα/K ratio of galaxies’ K-band arm regions and inter-arm regions. We have found that there is a significant enhancement of Hα/K ratio in K-band arm region, which refers to the location of the density wave. We have also found that the distribution of the HII regions locate on the leading edge of the K-band arms. Both evidences hint that the density wave is the dominant mechanism of star formation in these spiral galaxies, which is in agreement with the large-scale shock scenario, which predicts a high star formation efficiency in arm regions. | en_US |
| DC.subject | 恆星形成 | zh_TW |
| DC.subject | 密度波 | zh_TW |
| DC.subject | 螺旋星系 | zh_TW |
| DC.subject | spiral galaxy | en_US |
| DC.subject | density wave | en_US |
| DC.subject | star-formation | en_US |
| DC.title | 螺旋星系M51,M83和M101內恆星形成機制之研究 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Mechanism of star-formation in spiral galaxies M51, M83 and M101 | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |