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[最新结果]双子星望远镜观测到深度撞击!

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发表于 2005-7-8 10:58 | 显示全部楼层 |阅读模式
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Deep Impact Captured by Gemini      
Tuesday, 12 July 2005
The Gemini North telescope on Mauna Kea successfully captured the dramatic fireworks display produced by the collision of NASA';s Deep Impact probe with Comet 9P/Tempel 1. Researchers in two control rooms on Hawaii’s Big Island (on Mauna Kea and in Hilo) were able to keep enough composure amid an almost giddy excitement to perform a preliminary analysis of the data. They concluded from the mid-infrared spectroscopic observations that there was strong evidence for silicates or rocky material exposed by the impact. Little doubt remains that the unprecedented quality of the Gemini data will keep astronomers busy for years.

Gemini North Michelle mid-infrared (11.6 micron) false-color images of 9P/Tempel 1 ten minutes before impact (left), three hours after (center) and 24 hours after impact (right). Scale and orientation are the same for all images.
“The properties of the mid-infrared light were completely transformed after impact,” said David Harker of the University of San Diego, co-investigator for the research team. “In addition to brightening by a factor of about 4, the characteristics of the mid-infrared light was like a chameleon and within five minutes of the collision it looked like an entirely new object.” Harker’s research partner Chick Woodward of the University of Minnesota speculated further, “We are possibly seeing crystalline silicates which might even be similar to the beach sand here in Hawaii! This data will keep us busy trying to figure out the size and composition of these grains to better understand the similarities and differences between the material contained within comets and other bodies in the solar system.”

In addition to the spectroscopic observations, before-and-after images were also obtained by the Gemini telescope in thermal infrared light and can be seen in Figure 1.  Gemini monitored the comet for several weeks prior to the impact and will continue to watch it through the end of July.
The Gemini observations were part of a coordinated effort between the W.M. Keck, Subaru and Gemini Observatories so that each could concentrate on different observations and provide a complete, complementary “picture” of the impact. Astronomers anticipate that the data gathered from the largest and most sophisticated set of telescopes positioned to see the impact will add considerably to our understanding of comets as dynamic probes of our solar system’s early evolution some 4.5-5 billion years ago.
The Gemini observations were made using Michelle, the facility mid-infrared imager/spectrograph built at the Royal Observatory of Edinburgh (ROE) in the UK. The instrument has unique capabilities in the mid-infrared especially at Gemini which uses protected silver coatings on main mirrors to provide exceptional performance in the “thermal” or mid-infrared part of the spectrum.



 楼主| 发表于 2005-7-8 11:12 | 显示全部楼层

[最新结果]双子星望远镜观测到深度撞击!

大意:
位于夏威夷的双子星北座望远镜成功捕捉到NASA深度撞击探测器撞击坦普尔1号彗星所产生的戏剧性焰火。研究者们在中红外光谱仪的观测中发现了强有力的证据,表明撞击暴露出一些硅酸盐或岩石物质。毫无疑问,双子星望远镜获得的空前优质的数据,将使天文学家们忙上好几年。
附图为双子星望远镜拍摄的坦普尔1号彗星热红外图像。左侧是撞击前10分钟的照片,中间是撞击后3小时,右侧是撞击后24小时。三张照片中的比例和方向都相同。
中红外线中的彗星性质在撞击之后完全改变了,”研究小组成员David Harker说。“除了增亮大约4倍以外,中红外线中的性质就像变色龙一样,在撞击发生的5分钟内,它就像完全变成了新天体一样。”他的同事Chick Woodward进一步推测说,“我们可能看见了结晶硅酸盐,也许就像夏威夷海滩上的沙子一样!这些数据将会使我们忙于研究,试图指出这些颗粒的大小和成份,来更好地理解彗星和太阳系其他天体所包含的物质之间的共同点和不同点。”

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