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 bildet

ID:eso0806a
Type:Observasjon
Publiseringsdato:7. mars 2008
Relaterte pressemeldinger:eso0806
Størrelse:1727 x 1049 px

Om objektet

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

Bildeformater

Stor JPEG
1,5 MB
Medium JPEG
469,6 KB

Skrivebordsbakgrunner

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° til venstre for vertikalen

Farger og filtre

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