2020年10月5日

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NGC 5643: Nearby Spiral Galaxy from Hubble
Image Credit:
ESA/Hubble & NASA, A. Riess et al.; Acknowledgement: Mahdi Zamani

Explanation: What’s happening at the center of spiral galaxy NGC 5643? A swirling disk of stars and gas, NGC 5643’s appearance is dominated by blue spiral arms and brown dust, as shown in the featured image taken by the Hubble Space Telescope. The core of this active galaxy glows brightly in radio waves and X-rays where twin jets have been found. An unusual central glow makes NGC 5643 one of the closest examples of the Seyfert class of galaxies, where vast amounts of glowing gas are thought to be falling into a central massive black hole. NGC 5643, is a relatively close 55 million light years away, spans about 100 thousand light years across, and can be seen with a small telescope towards the constellation of the Wolf (Lupus).

Tomorrow’s picture: big mars


哈勃影像:邻近的螺旋星系NGC 5643
影像提供:
ESA/Hubble & NASA, A. Riess et al.; 志谢: Mahdi Zamani

说明: 螺旋星系NGC 5643的核心发生什么事? NGC 5643的涡旋状恒星和气体盘上,最突出的特征是泛蓝的旋臂和棕色的尘埃,就如这幅由哈勃太空望远镜拍摄的主题影像所示。而有二道喷流起源自星系核心的这个活跃星系,在无线电X射线波段都很明亮。在这类核心会发出异常明亮辉光的星系之中,M106是离我们最近的塞弗特星系,在其内咸认有巨量的辉光气体不停掉入核心的超质量黑洞里。相当邻近、宽约10万光年的NGC 5643,离我们只有5千5百万光年远,用小望远镜镜就能在南天的豺狼座方向看见它。

明日的图片: big mars

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