(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.

Crédit:

ESO

À propos de l'image

Identification:eso9920l
Type:Observation
Date de publication:27 février 1999
Communiqués de presse en rapport:eso9920, eso9916
Taille:1152 x 1277 px

À propos de l'objet

Nom:NGC 1232
Type:Local Universe : Galaxy : Type : Spiral
Distance:60 million années lumière
Catégorie:Galaxies

Image Formats

Grand JPEG
1,5 Mio

Fonds d'écran

1024x768
744,0 Kio
1280x1024
1,1 Mio
1600x1200
1,3 Mio
1920x1200
1,3 Mio
2048x1536
1,8 Mio

Couleurs & filtres

DomaineTélescope
Infrarouge
I
Very Large Telescope
FORS1
Visible
V
Very Large Telescope
FORS1