Copyright:Steve
Cannistra
原文:
Very faint but also very large on planet Earth’s sky, a giant Squid Nebula cataloged as Ou4, and Sh2-129 also known as the Flying Bat Nebula, are both caught in this scene toward the royal constellation Cepheus. Composed with a total of 20 hours of broadband and narrowband data, the telescopic field of view is almost 4 degrees or 8 Full Moons across. Discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula’s alluring bipolar shape is distinguished here by the telltale blue-green emission from doubly ionized oxygen atoms. Though apparently completely surrounded by the reddish hydrogen emission region Sh2-129, the true distance and nature of the Squid Nebula have been difficult to determine. Still, a recent investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, Ou4 would represent a spectacular outflow driven by HR8119, a triple system of hot, massive stars seen near the center of the nebula. If so, the truly giant Squid Nebula would physically be nearly 50 light-years across.
中文翻譯:
在這幅壯觀的圖片中,我們可以看到位於仙后座的巨大章魚星雲(Ou4)和飛蝙蝠星雲(Sh2-129)。該場景由總共20小時的寬頻和窄頻資料組成,觀測視野幾乎達到4度,相當於8個滿月的寬度。巨大章魚星雲由法國天文攝影師Nicolas Outters於2011年發現,其迷人的雙極形狀在這裡顯現出藍綠色的發射,源自雙重電離氧原子。雖然它似乎被紅色的氫發射區域Sh2-129完全包圍,但章魚星雲的真實距離和本質仍然難以確定。最近的研究表明,Ou4其實是位於Sh2-129內部,距離約2300光年。如果這一情況成立,Ou4將是一個壯觀的流出物,這一流出是由位於星雲中心附近的熱質量三重星系HR8119驅動的。如果如此,真正巨大的章魚星雲將幾乎達到50光年的寬度。
#章魚星雲 #飛蝙蝠星雲 #Ou4 #Sh2-129 #仙后座 #天文攝影 #星雲 #天文學 #太空探索 #美麗宇宙 #HR8119 #宇宙奇觀 #光年
來源:NASA每日圖片