File:Sig06-005.jpg
原始檔案 (1,500 × 1,500 像素,檔案大小:1.74 MB,MIME 類型:image/jpeg)
說明
摘要
[編輯]This false-color composite image shows the Cartwheel galaxy as seen by the Galaxy Evolution Explorer's Far Ultraviolet detector (blue); the Hubble Space Telescope's Wide Field and Planetary Camera-2 in B-band visible light (green); the Spitzer Space Telescope's Infrared Array Camera (IRAC) at 8 microns (red); and the Chandra X-ray Observatory's Advanced CCD Imaging Spectrometer-S array instrument (purple).
Approximately 100 million years ago, a smaller galaxy plunged through the heart of Cartwheel galaxy, creating ripples of brief star formation. In this image, the first ripple appears as an ultraviolet-bright blue outer ring. The blue outer ring is so powerful in the GALEX observations that it indicates the Cartwheel is one of the most powerful UV-emitting galaxies in the nearby universe. The blue color reveals to astronomers that associations of stars 5 to 20 times as massive as our sun are forming in this region. The clumps of pink along the outer blue ring are regions where both X-rays and UV radiation are superimposed in the image. These X-ray point sources are very likely collections of binary star systems containing a blackhole (called Massive X-ray Binary Systems). The X-ray sources seem to cluster around optical/UV bright supermassive star clusters.
The yellow-orange inner ring and nucleus at the center of the galaxy result from the combination of visible and infrared light, which is stronger towards the center. This region of the galaxy represents the second ripple, or ring wave, created in the collision, but has much less star for mation activity than the first (outer) ring wave. The wisps of red spread throughout the interior of the galaxy are organic molecules that have been illuminated by nearby low-level star formation. Meanwhile, the tints of green are less massive, older visible light stars.
Although astronomers have not identified exactly which galaxy collided with the Cartwheel, two of three candidate galaxies can be seen in this image to the bottom left of the ring, one as a neon blob and the other as a green spiral.
Previously, scientists believed the ring marked the outermost edge of the galaxy, but the latest GALEX observations detect a faint disk, not visible in this image, that extends to twice the diameter of the ring.
File info
[編輯]描述Sig06-005.jpg | Cartwheel Galaxy Makes Waves |
日期 | |
來源 | |
作者 | NASA/JPL-Caltech/P. N. Appleton (SSC/Caltech) |
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http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
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Individual images
[編輯]see http://gallery.spitzer.caltech.edu/Imagegallery/image.php?image_name=sig06-005 High quality tif files also avaliable.
授權條款
[編輯]Public domainPublic domainfalsefalse |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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目前 | 2007年7月11日 (三) 18:38 | 1,500 × 1,500(1.74 MB) | Anzibanonzi(留言 | 貢獻) | ==Summary== This false-color composite image shows the Cartwheel galaxy as seen by the Galaxy Evolution Explorer's Far Ultraviolet detector (blue); the Hubble Space Telescope's Wide Field and Planetary Camera-2 in B-band visible light (green); the Spitzer |
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影像標題 | 0.1 "/pixel |
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寬度 | 1,500 px |
高度 | 1,500 px |
壓縮方式 | LZW |
像素合成 | RGB |
方位 | 標準 |
像素數量 | 3 |
水平解析度 | 300 dpi |
垂直解析度 | 300 dpi |
資料排列 | 矮胖格式 |
使用軟體 | Adobe Photoshop CS2 Macintosh |
檔案修改日期時間 | 2006年3月15日 (三) 19:34 |
色彩空間 | 顏色未校準 |