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为什么我们的星系黑洞# 8217年代有一个小胃口吗

发布时间:2018-09-16 09:49 作者:admin 来源: 点击: 字号:

As we know by now, most galaxies, including our own, have a supermassive black hole at their center。 However, the one in our galaxy, Sagittarius A* (pronounced Sagittarius A-star) has a surprisingly small appetite, something which has puzzled astronomers for years。

This composite image combines observations using infrared light and X-ray light that see through the obscuring dust and reveal the intense activity near the galactic core。
IMAGE: X-RAY: NASA/CXC/UMASS/D。 WANG ET AL。; OPTICAL: NASA/ESA/STSCI/D。WANG ET AL。; IR: NASA/JPL-CALTECH/SSC/S。STOLOVY Via MIT News

Sagittarius A* is 4 million times as massive as the sun, but it is devouring much less material than it would be expected for a black hole of its size。 By studying 3 million seconds of observations taken by the Chandra X-Ray Observatory, a group of researchers from the MIT and the University of Massachusetts at Amherst believe they have found the answer。

“The black hole doesn’t have a chance to do its meat-grinder thing and turn that matter into energy,” says Joey Neilsen, who contributed to the research as a postdoc at MIT’s Kavli Institute for Astrophysics and Space Research。 “All of that stuff basically escapes before the black hole can destroy it。”

The group’;s work focused on iron and X-rays: iron can be found on the surface of stars, as well as in the gas surrounding a black hole; the iron is much hotter on the black hole。 To determine where the majority of X-rays were coming from, the researchers calculated the temperature of the iron, given its X-ray emission lines。 They calculated that there’;s plenty of hot iron, suggesting much of the X-ray activity arose not from a cluster of stars, but from gas surrounding the black hole。 So if there’;s all this hot material around it, why doesn’;t the black hole consume more?

本文源自: 环亚娱乐

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