Finding well-hidden galaxies

Well-hidden galaxies can be discovered through the imprint their interstellar gas leave on the spectrum of an even more remote quasar. Interstellar clouds of gas in galaxies, located between the quasars and us on the same line of sight, absorb parts of the light emitted by the quasars. The resulting spectrum consequently presents dark ''valleys'' that can be attributed to well-known elements and possibly molecules. In this schematic representation, the VLT observes (D) the features associated with three systems, located at different distances (A, B, and C), and whose light is therefore shifted by different amounts. The quasar, which acts as a beacon, is the bright object at the left of the image.

Källa:

ESO

Om bilden

ID:eso0813a
Typ:Illustration
Publiceringsdatum:13 maj 2008
Relaterade pressmeddelanden:eso0813
Storlek:914 x 691 px

Om objektet

Namn:Spectrum
Typ:Unspecified : Galaxy
Unspecified : Nebula : Type : Interstellar Medium
Kategori:Galaxies
Illustrations
Nebulae

Bildformat

Originalstorlek
549,0 kB
Stor jpeg
103,2 kB
Skärmstor jpeg
105,8 kB

Skrivbordsunderlägg

1024x768
123,8 kB
1280x1024
173,9 kB
1600x1200
221,7 kB
1920x1200
271,1 kB
2048x1536
311,5 kB