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.

Crediti:

ESO

A proposito dell'immagine

Identificazione:eso0806a
Tipo:Osservazione
Data di pubblicazione:07 Marzo 2008
Notizie relative:eso0806
Dimensione:1727 x 1049 px

A proposito delll'oggetto

Nome:Corona Australis, NGC 6726
Tipo:Milky Way : Nebula : Appearance : Reflection
Milky Way : Nebula : Type : Star Formation
Distanza:400 Anni luce
Constellation:Corona Australis
Categoria:Nebulae

Formati delle immagini

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Coordinate

Position (RA):19 0 48.58
Position (Dec):-36° 51' 11.89"
Field of view:8.29 x 5.04 arcminutes
Orientazione:Il Nord è a 110.0° a sinistra della verticale

Colori e filtri

BandaTelescopio
Infrarosso
J
New Technology Telescope
SOFI
Infrarosso
H
New Technology Telescope
SOFI
Infrarosso
K
New Technology Telescope
SOFI