無棒螺旋星系

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旋渦星系和它的衛星星系,旋渦星系是一個無棒螺旋星系。
無棒螺旋星系[1][2]是螺旋星系中的一種,在中心沒有棒狀結構,或者不是棒旋星系。它在星系型態分類的標示是SA。
寬帽星系是一個無棒螺旋星系。
無棒螺旋星系是de Vaucouleurs system分類法中三種螺旋星系中的一種,其他兩種分別是中間螺旋星系和棒旋星系。在哈伯音叉中,它是最常見的兩種螺旋星系之一,另一種就是棒旋星系。
分類

在
de Vaucouleurs分類系統中, SA-星系是三種螺旋星系之一。
例子
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類型
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圖像
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資訊
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註解
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SA0-
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SA0- 是透鏡星系的一種類型
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SA0
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SA0是透鏡星系的一種類型
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SA0+
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SA0+是透鏡星系的一種類型
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NGC 3593
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SA0/a
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SA0/a 可以考慮是一種無棒透鏡星系
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NGC 3593確實的分類是"SA(s)0/a"
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NGC 3169
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SAa
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NGC 3169確實的分類是"SA(s)a pec"
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梅西爾81
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SAab
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M81確實的分類是"SA(s)ab"
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梅西爾88
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SAb
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M88確實的分類是"SA(rs)b"
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NGC 3949
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SAbc
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NGC 3949確實的分類是"SA(s)bc"
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NGC 4414
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SAc
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NGC 4414確實的分類是"SA(rs)c"
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三角座星系
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SAcd
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三角座星系確實的分類是"SA(s)cd"
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NGC 300
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SAd
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NGC 300確實的分類是"SA(s)d"
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NGC 45
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SAdm
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SAdm可以考慮是無棒麥哲倫螺旋的一種
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NGC 45 is actually an "SA(s)dm"
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NGC 4395
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SAm
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Sam是麥哲倫螺旋 (Sm) 的一種
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NGC 4395確實的分類是"SA(s)m"
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參考資料
^ Astronomical Journal, "Near-infrared surface photometry and morphology in virgo cluster spiral galaxy nuclear regions", Bernard J. Rauscher, April 1995, Bibcode: 1995AJ....109.1608R, doi:10.1086/117389
^ Astronomy Pictures, "M99" (accessed 18 April 2010)
星系
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形態學 |
- 圓盤星系
矮星系
不規則星系
透鏡星系
- 特殊星系
環星系
螺旋星系
橢圓星系
巨大星系
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構造 |
- 棒
- 核球
- 暗物質暈
- 盤
星系暈
- 銀河平面
- 星際物質
- 原星系
- 螺旋臂
- 超大質量黑洞
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|
活躍核 |
- 相對論性噴流
- 類星體
- 西佛星系
- LINER星系
電波星系
- 耀变体
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活躍星系 |
|
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低活動 |
|
|
交互作用 |
- 恆星流
交互作用星系
- 衛星星系
星系群和星系團
- 超星系團
星系絲狀結構
- 視場星系
- 空洞星系
- 空洞和超空洞
- 星系潮汐
- 星系雲
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列表 |
星系
- 星系團
- 超星系团
- 超大類星體群
- 类星体
- 空洞
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相關條目 |
- 暗星系
- 暗藍星系
- 星系天文學
- 銀河系天文學
- 銀心
- 银道坐标系
- 星系的形成和演化
- 星系際塵埃
- 星系際旅行
- 星系際恆星
- 揭示計畫
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