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Sh2-3 (Emission Nebula)


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Sh2-3
Green Ring Nebula (緑の輪星雲)
Emission Nebula (散光星雲)
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別名 (Other names)

Sharpless 3, Sh 2-3, Gum 58, RCW 120

星座 (Constellation)
さそり座 (Sco) (Scorpius)

座標 (Coordinates)
(348.25°, 0.49°)

距離 (Distance)
4,500光年 (4,500 light-years)

Sh2-3 (Green Ring Nebula) is an emission nebula located 4,500 light years from the Earth in the constellation Scorpius.

Sh2-3 (Emission Nebula) : Picture

RCW 120 (Emission Nebula)
RCW 120 (Emission Nebula)
(C) NASA/JPL-Caltech/GLIMPSE-MIPSGAL Teams
Named RCW 120, this region of hot gas and glowing dust can be found in the murky clouds encircled by the tail of the constellation Scorpius. The ring of dust is actually glowing in infrared colors that our eyes cannot see, but show up brightly when viewed by Spitzer's infrared detectors. At the center of this ring are a couple of giant stars whose intense ultraviolet light has carved out the bubble, though they blend in with other stars when viewed in infrared.

The green ring is where dust is being hit by winds and intense light from the massive stars. The green color represents infrared light coming from tiny dust grains called polycyclic aromatic hydrocarbons. These small grains have been destroyed inside the bubble. The red color inside the ring shows slightly larger, hotter dust grains, heated by the massive stars.

This bubble is far from unique. Just as the Guardians of "Oa" have selected many beings to serve as Green Lanterns and patrol different sectors of space, Spitzer has found that such bubbles are common and an can be found around O stars throughout our Milky Way galaxy. The small objects at the lower right area of the image may themselves be similar regions seen at much greater distances across the galaxy.

RCW 120 (Emission Nebula)
RCW 120 (Emission Nebula)
(C) ESO/APEX/DSS2/ SuperCosmos/ Deharveng(LAM)/ Zavagno(LAM)
Colour composite image of RCW120. It reveals how an expanding bubble of ionised gas about ten light-years across is causing the surrounding material to collapse into dense clumps where new stars are then formed. The 870-micron submillimetre-wavelength data were taken with the LABOCA camera on the 12-m Atacama Pathfinder Experiment (APEX) telescope. Here, the submillimetre emission is shown as the blue clouds surrounding the reddish glow of the ionised gas (shown with data from the SuperCosmos H-alpha survey). The image also contains data from the Second Generation Digitized Sky Survey (I-band shown in blue, R-band shown in red).

RCW 120 (Emission Nebula)
RCW 120 (Emission Nebula)
(C) ESO/APEX & MSX/IPAC/NASA
Colour-composite image of RCW120 as seen by the ATLASGAL survey. RCW 120 is a region where an expanding bubble of ionised gas about ten light-years across is causing the surrounding material to collapse into dense clumps that are the birthplaces of new stars.

In this image, the ATLASGAL submillimetre-wavelength data are shown in red, overlaid on a view of the region in infrared light, from the Midcourse Space Experiment (MSX) in green and blue.

The Galactic HII Region RCW 120
The Galactic HII Region RCW 120
(C) ESO
Comparison between an image of the Galactic HII region RCW 120 in the visible (R-band; as obtained by the ESO Schmidt Telescope) and in the submillimetre with LABOCA on APEX, highlighting the need to observe in this wavelength range. The LABOCA image has an exposure of only slightly more than 3 hours. The expanding shell causes the surrounding gas to collapse into clumps, which are the cradles of massive stars. As the gas in these clumps is still very cold, around -250 degrees Celsius, they can only be seen at submillimetre wavelengths. Thanks to the high sensitivity and large field of view of LABOCA, astronomers could detect clumps that are four times fainter than was possible before. As the brightness is also a measure of the mass of these stellar embryos, this will allow scientists to study the formation of more representative, less massive stars.

Sh2-3 (Emission Nebula)
Sh2-3 (Emission Nebula)
(C) Image by Dean Salman - http://www.sharplesscatalog.com

RCW 120 RCW 120
RCW 120 (Emission Nebula)
(C) NASA
RCW 120 (Emission Nebula)
(C) ESO
RCW 120 Sh2-3
RCW 120 (Emission Nebula)
(C) ESO/APEX & MSX/IPAC/NASA
Sh2-3 (Emission Nebula)
(C) http://galaxymap.org/
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