Seeing through the Dark - Mapping the interior of interstellar clouds in great detail

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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 colors. The gradual saturation of the near-infrared bands is visible as a change of color. In diffuse regions the shorter wavelength J-band is strong and the color is bluish. When the J-band saturates the color changes first to green and finally, in the center of the filament, the red color 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. Posted on: 28 Mar, 2008

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