tóng-àn:Messier27.jpg
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Soat-bêngMessier27.jpg |
English: Emission line image of M27
This excellent image of the Dumbbell Nebula (M27, NGC6853), a planetary nebula in the constellation of Vulpecula, was taken at the 3.5-meter WIYN telescope using the mini-mosaic imager (described in an NOAO newsletter article). The nebula was formed when an evolved, red giant star ejected its outer envelope near the end of its lifetime. The expanding cloud of gas becomes visible once the hot core of the star, visible near the center, is exposed and the high-energy, ultraviolet light from the core ionizes the cloud. This makes the nebula emit mostly a strong emission-line spectrum. This color image was obtained by combining three separate pictures, each one taken through a narrow filter centered at the emission wavelengths of Hydrogen (H alpha, red, 656 nm), doubly ionized Oxygen (OIII, green, 501 nm), and neutral Oxygen (OI, blue, 630 nm). It is physically very interesting that neutral gas can survive in a region right next to highly ionized gas, and this image shows how, as the blue component is concentrated in very dense clumps which act to protect the neutral oxygen from the intense ultraviolet radiation which has ionized the other gas components. We can compare this to a picture combining three images all of ionized gases, (also from the WIYN telecope), and to the more usual color image from the Mayall 4-meter telescope, or the nice deep image from the 2.1-meter telescope. The Dumbbell nebula is about 850 light-years away from Earth and about 1.5 light-years in diameter (although both distance and size are very poorly constrained). Credit: George Jacoby, WIYN/NSF Coordinates Position (RA): 19 59 36.22 Position (Dec): 22° 43' 14.39" Field of view: 8.70 x 8.70 arcminutes Orientation: North is 0.2° right of vertical
Colors & filters Band Wavelength Telescope Optical Ol 630 nm WIYN 3.5-meter Telescope Mini Mosaic Optical Olll 501 nm WIYN 3.5-meter Telescope Mini Mosaic Optical Ha 656 nm WIYN 3.5-meter Telescope Mini Mosaic. |
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Ji̍t-kî | Nov. 7, 2002, | ||||
Chhut-chhù | https://noirlab.edu/public/images/noao-m27mm/ | ||||
Chok-chiá |
Credit: George Jacoby, WIYN/NSF |
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日期/ 時間 | 細張圖 | 寸尺 | 用者 | 註解 | |
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現在 | 2022年4月15日 (拜5) 20:36 | 3,700 × 3,700(2.24 MB) | Fabian RRRR | Better resolution, Copyright free image source |
影像連結
以下的頁連到這个影像:
元資料
影像標題 |
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製作/提供者 | George Jacoby, WIYN/NSF |
來源 | NSF's NOIRLab |
簡稱 |
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關鍵字 |
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聯絡資訊 |
950 North Cherry Ave. Tucson, AZ, 85719 USA |
使用條款 |
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Só-gé̤ṳ sĕng-sìng gì nĭk-gì sì-găng | 2002年11月7日 (拜4) 10:18 |
IIM 版本 | 4 |