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有史以来第一次我们# 8217已经看到一个黑洞被默默地生& # 8212不需要超新星

整理: admin时间: 2018-09-28

Astronomers have, for the first time in history, witnessed a dying star going black hole。 The surprising part? This momentous occasion wasn’;t marked by a fiery supernova。

Failed Supernova。

The expanding shell (left to right) of a failed red supergiant nova。
Image credits NASA。

The star of the show is/was N6946-BH1, a massive stellar body some 25 times our own sun。 It used to reside some 22 million light years away in the NGC 6946 galaxy or “;Fireworks Galaxy”;, so named for its spectacular and frequent bouts of supernova activity。 Starting in 2009, N6946-BH1 began to brighten slightly and by 2005 it seemed to have disappeared altogether。

To find out what happened to the star, a team of researchers led by Christopher Kochanek, professor of astronomy at The Ohio State University and the Ohio Eminent Scholar in Observational Cosmology, pointed the business end of the Large Binocular Telescope (LBT) at NGC 6946, to pick up on any infrared radiation emanating from the star。 They didn’;t find the star —; rather, they were surprised to see a black hole had silently popped into existence after NGC 6946 fizzled out。

Going out without a bang

Kochanek leads a team of astronomers who have been spent the last 7 years poking around space with the LBT looking for “;core collapses of massive stars that form black holes without luminous”; novae, but this is the first one they’;ve identifie********>After NGC 6946 went extinct, they trained the Hubble Space Telescope’;s gaze towards it location to see if it merely dimmed below visible levels, and the Spitzer Space Telescope to see if there’;s any infrared radiation going off from that point —; which would have been a sign that the star was obscured by a dust or think gas cloud。

本文源自: 环亚娱乐

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