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.

Crediti:

ESO

Riguardo l'immagine

Identificazione:eso0128f
Tipo:Mappa
Data di rilascio:14 Agosto 2001
Notizie relative:eso0128
Grandezza:800 x 400 px

Riguardo all'oggetto

Nome:NGC 1808
Tipo:Local Universe : Galaxy : Type : Barred
Distanza:40 Milione Anni luce
Categoria:Stars

Formati delle immagini

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