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A Dark Filament in Scattered Light

Part of a filament in the Corona Australis molecular cloud. The image is a composite of J-, H-, and K-band near-infrared observations that were made with the SOFI instrument on ESO's NTT telescope in August 2006. The observations were made to test, how easily the scattered light can be observed and how good it is as a tracer of cloud structure. The J-, H-, and K-band intensities are coded with blue, green, and red colours. The gradual saturation of the near-infrared bands is visible as a change of colour. In diffuse regions the shorter wavelength J-band is strong and the colour is bluish. When the J-band saturates the colour changes first to green and finally, in the centre of the filament, the red colour corresponding to the K-band becomes the strongest. In the most saturated regions the surface brightness data can only be used to derive a lower limit for the total amount of dust on the line of sight.

Credit:

ESO

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About the Image

Id:eso0806a
Type:Observation
Release date:7 March 2008
Related releases:eso0806
Size:1727 x 1049 px

About the Object

Name:Corona Australis, NGC 6726
Type:• Milky Way : Nebula : Type : Star Formation
• Milky Way : Nebula : Appearance : Reflection
• X - Nebulae
Distance:400 light years
Constellation:Corona Australis

Image Formats

Large JPEG
1.5 MB
Screensize JPEG
469.1 KB

Wallpapers

1024x768
760.6 KB
1280x1024
1.2 MB
1600x1200
1.7 MB
1920x1200
2.0 MB
2048x1536
2.3 MB

Coordinates

Position (RA):19 0 48.01
Position (Dec):-36° 50' 59.96"

Colours & filters

BandTelescope
Infrared
J
New Technology Telescope
SofI
Infrared
H
New Technology Telescope
SofI
Infrared
K
New Technology Telescope
SofI

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