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.

Kilde:

ESO

Om billedet

Id:eso0806a
Type:Observation
Udgivelsesdato:7. marts 2008
Relaterede pressemeddelelser:eso0806
Størrelse:1727 x 1049 px

Om objektet

Navn:Corona Australis, NGC 6726
Type:Milky Way : Nebula : Appearance : Reflection
Milky Way : Nebula : Type : Star Formation
Afstand:400 lysår
Constellation:Corona Australis
Kategori:Nebulae

Billedformater

Stor JPEG
1,5 MB
Skrærm JPEG
469,6 KB

Baggrundsbilleder

1024x768
761,1 KB
1280x1024
1,2 MB
1600x1200
1,7 MB
1920x1200
2,0 MB
2048x1536
2,3 MB

Koordinater

Position (RA):19 0 48.58
Position (Dec):-36° 51' 11.89"
Field of view:8.29 x 5.04 arcminutes
Orientering:Nord er 110.0° venstre fra lodret

Farver & filtre

BåndTeleskop
Infrarød
J
New Technology Telescope
SOFI
Infrarød
H
New Technology Telescope
SOFI
Infrarød
K
New Technology Telescope
SOFI