Stellar motions at the centre of NGC 1808

In this chart, the measured velocities (ordinate) of the stars near the centre of NGC 1808 are plotted at different distances from the nucleus (abscissa). The right half shows the corresponding curve after "removal" of the effect from the rotation — the remaining spread is a direct measure of the "velocity dispersion" and the individual stellar motions. As can be clearly seen, the width of the "band" decreases towards the centre, indicating the presence of a "dynamically cool" central stellar system.

Crédit:

ESO

À propos de l'image

Identification:eso0128f
Type:Graphique
Date de publication:14 août 2001
Communiqués de presse en rapport:eso0128
Taille:800 x 400 px

À propos de l'objet

Nom:NGC 1808
Type:Local Universe : Galaxy : Type : Barred
Distance:40 million années lumière
Catégorie:Stars

Image Formats

Grand JPEG
62,2 Kio