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題 名 | Near Infrared Polarimetric Imaging of the Giant HII Region NGC 3576=巨型氫離子區NGC 3576之近紅外偏極化觀測 |
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作 者 | 施逸昕; 陳文屏; 蕭文珊; | 書刊名 | 臺北天文館學報 |
卷 期 | 6 2008.12[民97.12] |
頁 次 | 頁13-17 |
分類號 | 323.8 |
關鍵詞 | 恆星形成; 紅外線觀測; 偏極化觀測; 星際物質; Star formation; Infrared; Polarimetry; Interstellar medium; |
語 文 | 英文(English) |
中文摘要 | NGC 3576 是銀河系當中最明亮的氫離子區之一,包括成群大質量恆星,它們具有紅外超量輻射,顯示這些恆星仍然非常年輕。我們利用配掛在位於南非 IRSF (Infra-Red Survey Telescope) 望遠鏡上的SIRPOL 近紅外相機,取得此區域之JHKs 偏極影像。我們的資料顯示整體偏極呈現以明亮恆星群為中心的對稱圖像,表示這些大質量恆星為照亮雲氣的主來光源。在某些深埋在雲氣中的星球附近,例如IRS-1 #69 以及 #85 ,有規律的塵埃空間分佈所造成的散射圖樣。對於背景恆星,我們沒有發現系統性偏極現象,這可能因為大質量恆星形成所造成的劇烈環境使得磁場結構受到扭曲的結果。 |
英文摘要 | NGC 3576 is one of the brightest HII regions in infrared, harboring a group of massive stars with infrared excess indicative of their youth. We present the near-infrared JHKs polarization images taken by SIRPOL, an infrared polarimeter camera mounted on the IRSF (Infra-Red Survey Facility) telescope in Sutherland, South Africa. An overall scattering pattern is seen centrally symmetric around the luminous stellar group, indicating their dominant role in illuminating the nebulosity. Organized scattering patterns also reveal special dust distribution around embedded infrared sources, e.g., a dust ridge associated with IRS−1 #69 and perhaps also with #85. We find no systematic polarization of background stars, which may be the consequence of an entangled magnetic field structure in a turbulent environment of massive star formation. |
本系統中英文摘要資訊取自各篇刊載內容。