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小麦哲伦星系的长尾

影像提供: NASA / JPL-Caltech / STScI

说明: 以16世纪航海家Ferdinand Magellan命名的小麦哲伦星系(Small Magellanic Cloud),是我们银河系的卫星星系,同时也是南天夜空中的珍宝。这个位在杜鹃座(Tucana)的小型不规则星系,离我们约有二十万光年。在光学望远镜所拍摄的影像中,它的成员星、云气和尘埃集结成中心的棒状和侧展出去的翼状结构。然而,在这幅来自史匹哲太空望远镜的红外组合假色影像里,除了较熟悉的棒和翼构造之外,这个星系还有向右延伸的尾部结构。这个可能是被(银河系)潮汐力拉出去的尾部结构,主要成份是云气、尘埃和新诞生的恒星。尾部结构中的二处红色亮斑,是新诞生星团加热周围尘埃云气的产物。

NGC660Hagar0_c900.jpg IC1795NBWeb4_goldman_c900.jpg ssc2010-02b_Lrg.jpg hickson31_hst.jpg NGC4565_hager9005B15D.jpg



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作品信息
作品名:ssc2010-02b_Lrg.jpg
文件名称:北回归线 / 星系
评分 (25 次投票):00000
关键词:2010 1 7
图片来源:翻译:天文实验室 (成功大学 物理学系 ;苏汉宗)
作品尺寸:1090 KiB
加入日期:五月 27, 2010
尺寸:3000 x 1768 像素
显示:426 次
Exif 作品宽度:3000 pixels
Exif 作品高度:1768 pixels
Exif 偏移量:2800
X 分辨率:72
Y 分辨率:72
作品简介:The infrared portrait of the Small Magellanic Cloud, taken by NASA's Spitzer Space Telescope, reveals the stars and dust in this galaxy as never seen before. The Small Magellanic Cloud is a nearby satellite galaxy to our Milky Way galaxy, approximately 200,000 light-years away. The image shows the main body of the Small Magellanic Cloud, which is comprised of the "bar" and "wing" on the left and the "tail" extending to the right. The bar contains both old stars (in blue) and young stars lighting up their natal dust (green/red). The wing mainly contains young stars. The tail contains only gas, dust and newly formed stars. Spitzer data has confirmed that the tail region was recently torn off the main body of the galaxy. Two of the tail clusters, which are still embedded in their birth clouds, can be seen as red dots. In addition, the image contains a galactic globular cluster in the lower left (blue cluster of stars) and emission from dust in our own galaxy (green in the upper right and lower right corners). The data in this image are being used by astronomers to study the lifecycle of dust in the entire galaxy: from the formation in stellar atmospheres, to the reservoir containing the present day interstellar medium, and the dust consumed in forming new stars. The dust being formed in old, evolved stars (blue stars with a red tinge) is measured using mid-infrared wavelengths. The present day interstellar dust is weighed by measuring the intensity and color of emission at longer infrared wavelengths. The rate at which the raw material is being consumed is determined by studying ionized gas regions and the younger stars (yellow/red extended regions). The Small Magellanic Cloud, and its companion galaxy the Large Magellanic Cloud, are the two galaxies where this type of study is possible, and the research could not be done without Spitzer. This image was captured by Spitzer's infrared array camera and multiband imaging photometer (blue is 3.6-micron light; green is 8.0 microns; and red is combination of 24-, 70- and 160-micron light). The blue color mainly traces old stars. The green color traces emission from organic dust grains (mainly polycyclic aromatic hydrocarbons). The red traces emission from larger, cooler dust grains. The image was taken as part of the Spitzer Legacy program known as SAGE-SMC: Surveying the Agents of Galaxy Evolution in the Tidally-Stripped, Low Metallicity Small Magellanic Cloud.
分辨率:Inch
定位:1: Normal (0 deg)
软件:Adobe Photoshop CS3 Macintosh
颜色空间:Uncalibrated
IPTC 标题:Little Galaxy with a Tail
IPTC 版权:http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml
IPTC 关键词:SMC Small Magellanic Cloud NGC 292
URL:http://album.skylook.org/displayimage.php?pid=7035
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