This image has been captured by my dear friend Luiz Duczmal at his observatory close to SONEAR observatory, Belo Horizonte - Brazil. Pleasae have a look on
http://www.astrobin.com/184880/?nc=userA dark nebula or absorption nebula is a type of interstellar cloud that is so dense that it obscures the light from objects behind it, such as background stars and emission or reflection nebulae. The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger[clarification needed] molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules. Like other interstellar dust or material, things it obscures are only visible using radio waves in radio astronomy or infrared in infrared astronomy.
Dark clouds are made up by sub-micrometre-sized dust particles, coated with frozen carbon monoxide and nitrogen, which effectively block the passage of light at visible wavelengths. Also present are molecular hydrogen, atomic helium, C18O (CO with oxygen as the 18O isotope), CS, NH3 (ammonia), H2CO (formaldehyde), c-C3H2 (cyclopropenylidene) and a molecular ion N2H+ (diazenylium), all of which are relatively transparent. These clouds are the spawning grounds of stars and planets, and understanding their development is essential to understanding star formation.
In the image shown, the Dark Nebulae from Scutum can be seen .
The image:
SUB-Frames: 44 x 300sec total
Telescope: Takahashi FSQ 106ED
Camera: QHY16200A
Mount: Astrophysics AP MATCH1 GTO
Guiding: OAG + QHY5L
Filters: Baader LRGB 2"
Digital Focuser
Pixel Scale: 2.326 arcsec/pixel
Field Size: 1.869 degrees
Processing:
Post and Pre-processing: PixInsight 1.8.5
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