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宏观螺旋星系

史匹哲太空望远镜拍摄的宏观螺旋星系:M81

宏观螺旋星系螺旋星系的一种,相对于多旋臂和絮结螺旋星系,有着突出和定义明确的螺旋臂。宏观螺旋星系的螺旋臂在星系附近很明显的延伸许多的弧度,并且在可观测到的星系弧度上占有很大的比率。螺旋星系中大约有10%被归类为宏观螺旋星系[1],包括M81M51M74M100、和M101

宏观结构的起源

密度波理论可以完美的解释并且很好的规范宏观螺旋星系[2]。依据这个理论,螺旋臂是在盘面上的恒星经过密度波时因为速度不同而被扭转的。恒星密集在这些区域造成引力吸引物质在此处密集,但是它们并不会永久存在于螺旋臂中。当它们紧靠着螺旋臂时,它们受到引力的牵引往物质密集之处;然后当他们通过螺旋臂之后,它们也会因为引力的拉扯而减慢速度,这就造成物质密集的集中在这一区域。

参考资料

  1. ^ Mihos, Chris, Spiral Structure, 2002-01-11 [2007-05-30], (原始内容存档于2019-06-08) 
  2. ^ Masters, Karen, What is the Origin of Spiral Structure in Galaxies, 2002-09 [2007-05-30], (原始内容存档于2007-06-09) 
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宏观螺旋星系
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