Copyright:
Ogle et
al.
中文翻譯:
在遙遠的安德羅梅達星系（Andromeda Galaxy）附近，發現了一些巨型的藍色弧形，這些弧形被俗稱為SDSO 1。這些微弱的弧形在2022年被業餘天文學家發現，佔據了幾乎與安德羅梅達星系相同的角度大小。一開始，這些弧形的來源是一個謎：它們究竟距離安德羅梅達星系很近，還是距離我們的太陽很近呢？現在，經過550小時的合成曝光，以及業餘與專業天文學家的合作，獲得了強有力的證據顯示：SDSO 1並不是在星系之間，而是在我們的銀河系內，這是一種新的行星狀星雲類別。我們稱它為幽靈行星狀星雲（Ghost Planetary Nebula, GPN），而SDSO 1是這個新子類別中的第一個被認可的成員，還有七個其他新近被識別的星雲。藍色的部分顯示了由衝擊波造成的極微弱氧氣發射，而周圍的紅色則是發出氫氣的光輝，這顯示了GPN的年齡。
原文:
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.
來源:NASA每日圖片
