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.

Bildnachweis:

ESO

Über das Bild

ID:eso0128f
Typ:Aufsuchkarte
Veröffentlichungsdatum:14. August 2001
Dazugehörige Veröffentlichungen:eso0128
Größe:800 x 400 px

Über das Objekt

Name:NGC 1808
Typ:Local Universe : Galaxy : Type : Barred
Entfernung:40 Million Lichtjahre
Kategorie:Stars

Bildformate

Großes JPEG
62,2 KB