Map of the obscuration in the dark cloud B68

This photo shows the degree of obscuration in the area around B68, as an iso-extinction map. It is based on measurements of background stars. The angular resolution is 10 arcsec. The outermost contour corresponds to a visual extinction of 4 magnitudes (this means that visible light is dimmed/obscured by a factor of 40) and increases in steps of 2 magnitudes (a factor of 6.3) up to 35 magnitudes at the centre (an obscuration factor of 10 14 or 100 million million times)! Because the dust extinction is tracing the main mass component of this cloud, molecular hydrogen (H 2), this map is also a very good representation of the distribution of mass inside B68.

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Om bilden

ID:eso9934c
Typ:Diagram
Publiceringsdatum:2 juli 1999
Relaterade pressmeddelanden:eso9934
Storlek:787 x 766 px

Om objektet

Namn:B 68, Barnard 68
Typ:Milky Way : Nebula : Appearance : Dark : Bok Globule
Avstånd:500 ljusår
Kategori:Nebulae

Bildformat

Originalstorlek
118,3 kB
Stor jpeg
85,6 kB
Skärmstor jpeg
111,0 kB