霍格的目标：一个近乎完美的环状星系
(原标题: Hoag's Object: A Nearly Perfect Ring Galaxy)
2024-02-18
浏览次数: 14
这是一个星系还是两个星系？1950年，天文学家阿瑟·霍格偶然发现了这个不寻常的星系外物体，这个问题才浮出水面。外围是一个由明亮的蓝色恒星组成的环，而靠近中心的地方是一个由更红的恒星组成的球，这些恒星可能更老。两者之间是一个几乎完全黑暗的间隙。霍格天体是如何形成的，包括它由恒星和气体组成的近乎完美的圆形环，仍然是未知的。关于起源的假说包括数十亿年前的一次星系碰撞，以及后来消失的中央棒子的引力作用。这张特色照片是由哈勃太空望远镜拍摄的，并使用人工智能去噪算法进行了重新处理。无线电波的观测表明，在过去的十亿年中，霍格天体并没有吸积一个更小的星系。霍格的天体直径约10万光年，距离蛇星座约6亿光年。在右边可以看到许多遥远的星系，而巧合的是，在大约7点钟方向的空隙中可以看到另一个更遥远的环状星系。
查看原文解释
Is this one galaxy or two? This question came to light in 1950 when astronomer Arthur Hoag chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed, including its nearly perfectly round ring of stars and gas, remains unknown. Genesis hypotheses include a galaxy collision billions of years ago and the gravitational effect of a central bar that has since vanished. The featured photo was taken by the Hubble Space Telescope and reprocessed using an artificially intelligent de-noising algorithm. Observations in radio waves indicate that Hoag's Object has not accreted a smaller galaxy in the past billion years. Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of the Snake (Serpens). Many galaxies far in the distance are visible toward the right, while coincidentally, visible in the gap at about seven o'clock, is another but more distant ring galaxy.