(V-I) colour index in NGC 1232

This "(V-I) colour-index image" was produced in the same way as eso9920k. It is based on two other exposures, taken on the same date, through a visual-green filter (V) and a near-infrared-red filter (I), respectively. The exposure time was 3 min for both. The field size and orientation is the same. The round, dark spot at the upper left is an artefact. Dust lanes in the spiral arms absorb more green light and therefore appear redder than their surroundings. In this differential image, they are seen as dark regions. They are exceptionally sharp and particularly strong in the inner part of the galaxy.

Källa:

ESO

Om bilden

ID:eso9920l
Typ:Observation
Publiceringsdatum:27 februari 1999
Relaterade pressmeddelanden:eso9920, eso9916
Storlek:1152 x 1277 px

Om objektet

Namn:NGC 1232
Typ:Local Universe : Galaxy : Type : Spiral
Avstånd:60 miljon ljusår
Kategori:Galaxies

Bildformat

Stor jpeg
1,5 MB

Skrivbordsunderlägg

1024x768
744,0 kB
1280x1024
1,1 MB
1600x1200
1,3 MB
1920x1200
1,3 MB
2048x1536
1,8 MB

Färger och filter

BandTeleskop
Infrarött
I
Very Large Telescope
FORS1
Synligt ljus
V
Very Large Telescope
FORS1