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題名 | Population of Young Stellar Objects in Nearby Molecular Clouds=鄰近分子雲內的原恆星數量統計 |
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作者姓名(中文) | 謝天皓; 賴詩萍; | 書刊名 | 臺北天文館學報 |
卷期 | 8 2010.12[民99.12] |
頁次 | 頁43-46 |
分類號 | 323.8 |
關鍵詞 | 原恆星; 雙色指數圖; 星等星色圖; Protostar; Color-color diagram; Color-magnitude diagram; |
語文 | 英文(English) |
中文摘要 | 我們發明一種新的方法利用Spitzer太空望遠鏡的光度資料來找出在分子雲內的原恆星。由於原恆星與背景星系的光譜在紅外線波段相當類似,而Spitzer能夠觀測到很暗的背景星系,因此,原恆星的統計工作成為一個困難的問題。以往的方式是比較原恆星跟星系的樣本在雙色指數圖或星等星色圖上的分布位置。然而,使用何種雙色指數圖以及星等星色圖來統計卻因人而異,而原恆星或星系的分布區域常是人為定義出來的。這裡,我們發展一個新的分類方式,以統計三到五度星等空間的星系樣本密度來做為星系機率。這個方法可以減低人為的誤差,並且使用多度星等空間等同於考慮了所有星等星色圖的組合。因此,我們可以公平的找出分子雲內的原恆星。 |
英文摘要 | We develop a new method to identify YSOs from star-forming regions using the photometry data of the Spitzer space telescope. Because SEDs of YSOs are similar to SEDs of background galaxies and Spitzer is sensitive enough to detect those galaxies, it has been difficult to separate YSOs and galaxies using only those photometry data. To solve this problem, previous works have developed several criteria according to the difference of the areas occupied by YSOs and galaxy sample in color-magnitude and color-color diagrams (hereafter CMD and CCD). However, different works used different CMDs and CCDs and defined criteria for separating YSOs and galaxies are often set by eyes. Here we develop a new method to measure the probability for a source to be a background galaxy; we calculate the density of pure galaxy sample in the multi-dimensional magnitude space and use the density as the probability of background galaxy. Our method is equivalent to use all CMDs and without artificial criteria. Thus, we can fairly identify the YSOs in the star-forming regions. |
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