ngc7714_hubble_3269

Image Credit: NASA, ESA; Acknowledgement: A. Gal-Yam (Weizmann Inst.)

별로 이어진 거대한 고리를 향해 은하가 뚫고 지나간 것일까? 그건 아니다. 사진 속 주변 은하와 충돌을 겪으면서 길게 늘어지고 휘어진 은하 NGC 7714에 숨겨진 역학적인 과정은 아직 완벽히 밝혀지지는 않았다. 위 장면에서 왼쪽에 놓인 작은 이웃 은하 NGC 7715는 NGC 7714의 오른쪽을 향해 강력하게 날아왔다. 관측을 통해 금빛으로 빛나는 사진에 담긴 고리 형태 구조는 공간을 돌아다니는 태양과 같은 별 수백만개와 내부의 푸른 별들이 모여 이루어졌다는 것을 알게 되었다. NGC 7714는 물고기자리 방향으로 약 1억 광년 거리에 놓여있다. 이 두 은하 사이의 상호작용은 약 1억5천만년 전부터 시작해 수억년동안 쭉 진행되면서, 결국 중심에 하나로 합쳐진 은하를 만들게 된다.

Explanation: Is this galaxy jumping through a giant ring of stars? Probably not. Although the precise dynamics behind the featured image is yet unclear, what is clear is that the pictured galaxy, NGC 7714, has been stretched and distorted by a recent collision with a neighboring galaxy. This smaller neighbor, NGC 7715, situated off to the left of the featured frame, is thought to have charged right through NGC 7714. Observations indicate that the golden ring pictured is composed of millions of older Sun-like stars that are likely co-moving with the interior bluer stars. In contrast, the bright center of NGC 7714 appears to be undergoing a burst of new star formation. NGC 7714 is located about 100 million light years away toward the constellation of the Fish (Pisces). The interactions between these galaxies likely started about 150 million years ago and should continue for several hundred million years more, after which a single central galaxy may result.

 

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
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