The unexpectedly lonely galaxy 3C 297, discovered 9.2 billion light-years from Earth, has challenged existing theories on galaxy formation. Researchers suggest it may be the most distant 'fossil group' ever discovered, where one galaxy has absorbed its former companions. A distant — and lonely —
Astronomers have discovered an unusually lonely galaxy, 3C 297, using NASA’s Chandra X-ray Observatory and the International Gemini Observatory. Located 9.2 billion light-years from Earth, the galaxy appears to have assimilated its former companion galaxies, challenging current understanding of galaxy and galaxy cluster formation.
The unexpectedly solo galaxy is located about 9.2 billion light-years from Earth and contains a quasar, a supermassivepulling in gas at the center of the galaxy and driving powerful jets of matter seen in radio waves. The environment of this galaxy, known as 3C 297, appears to have the key features of a galaxy cluster, enormous structures that usually contain hundreds or even thousands of galaxies. Yet 3C 297 stands alone.
Second, the supermassive black hole’s jet has created an intense source of X-rays about 140,000 light-years away, implying that it has plowed into gas surrounding the galaxy. A third trait of galaxy clusters possessed by 3C 297, previously reported in Karl G. Jansky Very Large Array data, is that one of the radio jets is bent, showing that it has interacted with its surroundings.
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