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銀河系突現大量新星 來源不明
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Topic: 銀河系突現大量新星 來源不明 (Read 122 times)
yaunzunsha
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銀河系突現大量新星 來源不明
December 07, 2017, 01:20:31 PM
#1
科學家在銀河系中發現大量新星,組成30光年寬的星團,其來源不明。尤其令人驚訝的是
,科學家使用最簡單的方法即輕易地發現了這些新星。
據天文學網站「太空」(Space)12月5日報導,這些新星似乎在等待被人發現,因為科學
家使用最基本的位置與距離比較法,即輕鬆地鑑別出這些新星的位置和範圍。
因為該發現屬於歐洲蓋亞太空望遠鏡的觀測項目,所以科學家將這些新星聚集成的星團命
名為蓋亞1星團(Gaia1)。
蓋亞1星團有30光年寬,很大很亮。科學家表示,以前人們對該星團所在的空間不知研究
了多少遍,也沒有發現那裡有如此多的星體。
科學家在研究報告中寫道:「多少代的天文學家都一定注視過蓋亞1所在的空間,但都沒
有看到它的存在。」
來源不明
科學家無法確定蓋亞1星團的年齡、成分及來源。物理學網站phys.org 9月報導,這是蓋
亞太空望遠鏡在今年5月份首次發現的星團。
蓋亞太空望遠鏡可以非常精確地測量各種星體的質量,因此科學家測得蓋亞1星團與地球
的距離為1.5萬光年,質量相當於2.2萬個太陽。
但是,科學家無法判斷其具體年齡,起初認為蓋亞1星團有63億年之久,但是隨後的觀測
數據顯示其年齡應該約為30億年。
科學家也無法確定其中的成分,推測那裡的星體可能富含重元素。
報導說,蘭卡斯特大學(Lancaster University)的天文學家安德烈斯‧柯赫(Andreas
Koch)描述,已在蓋亞1星團所含的四顆紅巨星之中測到14種元素,如鋰、碳、氧、鎂、
鋁、矽、鈣等。
這些元素成分提示,這些新生星體的總質量很大。而且,這些元素可能和銀河系的塵埃盤
有關。但是科學家強調,目前的天文理論無法解釋蓋亞1星團的形成及來源。
銀河系不斷發現新天體
近年來,科學家發現銀河系出現各種出乎意料的星體,如2.2萬光年遠之外的一顆巨大行
星OGLE-2016-BLG-1190Lb,其尺寸和質量之大令科學家困惑。
因為按照目前的恆星和行星定義,OGLE-2016-BLG-1190Lb的尺寸可劃分為褐矮星,但是質
量又不大符合褐矮星的級別。
2016年7月,天文學家說,銀河系中心發現一個奇怪的X形結構,裡面含有古老的星體。
參與觀測項目的加拿大多倫多大學(University of Toronto)天文學家達斯丁‧朗(
Dustin Lang)解釋,通過廣域紅外巡天相機(WISE)觀測到銀河系中心存在一個螺旋形
扁平圓盤,它有四條旋臂,看起來像是一個「四方形花生豆」,這種神奇的形狀與整個星
系扁平形相比,非常顯眼。
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銀河系突現大量新星 來源不明
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