本帖最后由 gohomeman1 于 2009-4-1 00:57 编辑
看来我是可以成为翻译团队成员了。一次性发完这个翻译。
This optical and infrared image from the Digitized Sky Survey shows the crowded field around the micro-quasar GRS 1915+105 (GRS 1915 for short) located near the plane of our Galaxy. The inset shows a close-up of the Chandra image of GRS 1915, one of the brightest X-ray sources in the Milky Way galaxy. This micro-quasar contains a black hole about 14 times the mass of the Sun that is feeding off material from a nearby companion star. As the material swirls toward the black hole, an accretion disk forms. Powerful jets have also been observed in radio images of this system, along with remarkably unpredictable and complicated variability ranging from timescales of seconds to months.
本合成图的可见光和红外线图像来自数字巡天计划。图像显示位于银道面附近的微型类星体GRS1915+105(简称GRS1915)周围的拥挤星空场。左上的小图是大图中框选部分的特写，由钱德拉X线卫星拍摄，它是银河系最亮的X源之一。微型类星体内含一个14倍太阳质量的黑洞，由伴星供给其物质（原文明显笔误，是feeding of而不是off——译注）。当物质成漩涡状落向黑洞时，就会形成一个吸积盘。射电观测也发现这个系统的高能喷流，喷射强度复杂易变、不可预知，变化周期从几秒到几月不等。
With its High Energy Transmission Grating, Chandra has observed GRS 1915 eleven times since its launch in 1999. These studies reveal that the jet in GRS 1915 may be periodically choked off when a hot wind, seen in X-rays, is driven off the accretion disk around the black hole (view the animation below). The wind is believed to shut down the jet by depriving it of matter that would have otherwise fueled it. Conversely, once the wind dies down, the jet can re-emerge. These results suggest that these black holes have a mechanism for regulating the rate at which they grow. Self-regulation is a common topic when discussing supermassive black holes, but this is the first clear evidence for it in a system containing a stellar-mass black hole.
自从1999年升空以来，钱德拉卫星已经透过它的高能透射光栅观察过GRS 1915达11次了。这些研究显示当高热星风吹散黑洞周围的吸积盘时，GRS 1915的喷射会周期性的停止（下面有动画演示）。相信星风停止喷流就像我们关闭燃气灶的燃料一样。相反的，一旦星风消失，喷流就会重新浮现。这现象说明黑洞有一个调节其自身成长速度的机制。在讨论（星系级）超大质量黑洞时，自我调节机制是一个公共主题，这是头一次在恒星级黑洞发现了如此明显的证据。
——by gohomeman1 |
置顶卡
变色卡
千斤顶
显身卡
