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(credits to Anglo-Australian Observatory)

 PILLARS OF CREATION IN A STAR-FORMING REGION (Gas Pillars in M16 - Eagle Nebula)
 


Undersea corral? Enchanted castles? Space serpents? These eerie, dark pillar-like structures are actually columns of cool interstellar hydrogen gas and dust that are also incubators for new stars. The pillars protrude from the interior wall of a dark molecular cloud like stalagmites from the floor of a cavern. They are part of the "Eagle Nebula" (also called M16 -- the 16th object in Charles Messier's 18th century catalog of "fuzzy" objects that aren't comets), a nearby star-forming region 7,000 light-years away in the constellation Serpens.

The pillars are in some ways akin to buttes in the desert, where basalt and other dense rock have protected a region from erosion, while the surrounding landscape has been worn away over millennia. In this celestial case, it is especially dense clouds of molecular hydrogen gas (two atoms of hydrogen in each molecule) and dust that have survived longer than their surroundings in the face of a flood of ultraviolet light from hot, massive newborn stars (off the top edge of the picture). This process is called "photoevaporation. "This ultraviolet light is also responsible for illuminating the convoluted surfaces of the columns and the ghostly streamers of gas boiling away from their surfaces, producing the dramatic visual effects that highlight the three-dimensional nature of the clouds. The tallest pillar (left) is about a light-year long from base to tip.

As the pillars themselves are slowly eroded away by the ultraviolet light, small globules of even denser gas buried within the pillars are uncovered. These globules have been dubbed "EGGs." EGGs is an acronym for "Evaporating Gaseous Globules," but it is also a word that describes what these objects are. Forming inside at least some of the EGGs are embryonic stars -- stars that abruptly stop growing when the EGGs are uncovered and they are separated from the larger reservoir of gas from which they were drawing mass. Eventually, the stars themselves emerge from the EGGs as the EGGs themselves succumb to photoevaporation.

The picture was taken on April 1, 1995 with the Hubble Space Telescope Wide Field and Planetary Camera 2. The color image is constructed from three separate images taken in the light of emission from different types of atoms. Red shows emission from singly-ionized sulfur atoms. Green shows emission from hydrogen. Blue shows light emitted by doubly-ionized oxygen atoms.

Credit: Jeff Hester and Paul Scowen (Arizona State University), and NASA


STELLAR "EGGS" EMERGE FROM MOLECULAR CLOUD (Star-Birth Clouds in M16)

This eerie, dark structure, resembling an imaginary sea serpent's head, is a column of cool molecular hydrogen gas (two atoms of hydrogen in each molecule) and dust that is an incubator for new stars. The stars are embedded inside finger-like protrusions extending from the top of the nebula. Each "fingertip" is somewhat larger than our own solar system.

The pillar is slowly eroding away by the ultraviolet light from nearby hot stars, a process called "photoevaporation". As it does, small globules of especially dense gas buried within the cloud is uncovered. These globules have been dubbed "EGGs" -- an acronym for "Evaporating Gaseous Globules". The shadows of the EGGs protect gas behind them, resulting in the finger-like structures at the top of the cloud.

Forming inside at least some of the EGGs are embryonic stars -- stars that abruptly stop growing when the EGGs are uncovered and they are separated from the larger reservoir of gas from which they were drawing mass. Eventually the stars emerge, as the EGGs themselves succumb to photoevaporation.

The stellar EGGS are found, appropriately enough, in the "Eagle Nebula" (also called M16 -- the 16th object in Charles Messier's 18th century catalog of "fuzzy" permanent objects in the sky), a nearby star-forming region 7,000 light-years away in the constellation Serpens.

The picture was taken on April 1, 1995 with the Hubble Space Telescope Wide Field and Planetary Camera 2. The color image is constructed from three separate images taken in the light of emission from different types of atoms. Red shows emission from singly-ionized sulfur atoms. Green shows emission from hydrogen. Blue shows light emitted by doubly- ionized oxygen atoms.

Credit: Jeff Hester and Paul Scowen (Arizona State University), and NASA
 

                    

Observer´s Log

Cluster+Nebulosity
Eagle Nebula
Star Queen Nebula
M16
NGC 6611
Other description: Nebula with dust and cluster.
Constellation: Ser
Dreyer description: Cluster, at least 100 stars large & small; = M16.
Magnitude: 6.0
RA: 18h 19m 03.8s Dec: -13°46'57"
RA: 18h 18m 48.0s Dec: -13°47'00" (Epoch 2000)
Size:35.0'
 

 

 

 

 

M16

 

Number of Frames: 9

Exposure:  300s ISO 800

Equipment: Takahashi FS-102NS, f/8, Canon EOS300D camera in prime focus

Date: 05-08-28

Reduced, aligned and stacked with ImagesPlus; final processing with Photoshop CS

 

 

 

 

 

 

 

M16

Details as above but cropped

 

 

 

 

M16

 

Number of Frames: 4

Exposure:  180s ISO 800

Equipment: Meade LX 200-12", f/10, Canon EOS300D camera in prime focus

Date: 04-08-13

Processed with Photoshop CS.

 

   

 

 

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This site was last updated 2006-04-20                                                                                                          Site created and maintained by Jorge Lázaro