朝向仙女座的蓝色弧线
(原标题: Blue Arcs Toward Andromeda)
2025-08-04
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仙女座星系（M31）附近的这些巨大的蓝色弧线是什么？由业余天文学家于2022年发现的微弱弧线——被称为SDSO 1——与M31本身的角度大小几乎相同。起初，它们的起源是个谜：它们实际上是靠近仙女座星系，还是靠近我们的太阳？现在，经过550多个小时的联合曝光和业余天文学家和专业天文学家的合作，已经揭示了它们真实性质的有力证据：SDSO 1不是星系间星云，而是我们银河系内的一类新的行星状星云。SDSO 1被称为幽灵行星状星云（GPN），是褪色行星状星云新亚类的第一个被确认的成员，以及最近发现的其他七个成员。蓝色显示的是激波中极其微弱的氧气发射，而周围的红色是氢发射的痕迹，表明了GPN的年龄。
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What are these gigantic blue arcs near the Andromeda Galaxy (M31)? Discovered in 2022 by amateur astronomers, the faint arcs -- dubbed SDSO 1 -- span nearly the same angular size as M31 itself. At first, their origin was a mystery: are they actually near the Andromeda Galaxy, or alternatively near to our Sun? Now, over 550 hours of combined exposure and a collaboration between amateur and professional astronomers has revealed strong evidence for their true nature: SDSO 1 is not intergalactic, but a new class of planetary nebula within our galaxy. Dubbed a Ghost Planetary Nebula (GPN), SDSO 1 is the first recognized member of a new subclass of faded planetary nebulas, along with seven others also recently identified. Shown in blue are extremely faint oxygen emission from the shock waves, while the surrounding red is a hydrogen-emitting trail that indicates the GPN's age.
© Ogle et al.