Disc heating in NGC 2985

Details Disc heating in NGC 2985 Disc heating in NGC 2985

2000-05-23

arxiv.org/abs/astro-ph/0005454v1

Mon.Not.Roy.Astron.Soc. 317 (2000) 545

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures. Accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03667.x

Various processes have been proposed to explain how galaxy discs acquire their thickness. A simple diagnostic for ascertaining this ``heating'' mechanism is provided by the ratio of the vertical to radial velocity dispersion components. In a previous paper we have developed a technique for measuring this ratio, and demonstrated its viability on the Sb system NGC 488. Here we present follow-up observations of the morphologically similar Sab galaxy NGC 2985, still only the second galaxy for which this ratio has been determined outside of the solar neighbourhood. The result is consistent with simple disc heating models which predict ratios of $\sigma_z / \sigma_R$ less than one

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