Accretion Discs Show Their True Colours

Artist's impression showing the principle followed by the team to uncover the true colour of the quasars' disc. The red star-like object in the upper left panel is one of the quasars observed. The light is thought to originate from an accretion disc around a black hole with a strong contamination from messy dust clouds, as shown by the drawing on the upper-right panel. When the astronomers put a polarising filter in, these clouds are suppressed from view, giving us the true colour of the accretion disc, as shown in the two lower panels. Some of the quasars have a very small amount of scattered light coming from the vicinity of the black hole itself, rather than the clouds of gas and dust around it. This light has become polarised after hitting matter within the disc. By using a filter that only allows this polarised light to come through and blocks out the unpolarised light from the gas clouds, they were able to visually eliminate them and reveal the disc. Figure by M. Kishimoto, with cloud image by M. Schartmann.

Credit:

M. Kishimoto & M. Schartmann

About the Image

Id:eso0821a
Type:Collage
Release date:23 July 2008
Related releases:eso0821
Size:1024 x 768 px

About the Object

Name:Quasar
Type:• Unspecified : Galaxy : Activity : AGN : Quasar
• X - Quasars & Black Holes

Image Formats

Large JPEG
89.7 KB
Screensize JPEG
80.5 KB

Wallpapers

1024x768
88.2 KB
1280x1024
126.9 KB
1600x1200
164.4 KB
1920x1200
213.9 KB
2048x1536
241.0 KB

Also see our