(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.

Crediti:

ESO

Riguardo l'immagine

Identificazione:eso9920l
Tipo:Osservazione
Data di rilascio:27 Febbraio 1999
Notizie relative:eso9920, eso9916
Grandezza:1152 x 1277 px

Riguardo all'oggetto

Nome:NGC 1232
Tipo:Local Universe : Galaxy : Type : Spiral
Distanza:60 Milione Anni luce
Categoria:Galaxies

Formati delle immagini

JPEG grande
1,5 MB

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744,0 KB
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1,1 MB
1600x1200
1,3 MB
1920x1200
1,3 MB
2048x1536
1,8 MB

Colori e filtri

BandaTelescopio
Infrarosso
I
Very Large Telescope
FORS1
Ottico
V
Very Large Telescope
FORS1