期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 317, 期 3, 页码 545-549出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2000.03667.x
关键词
galaxies : individual : NGC 2985; galaxies : kinematics and dynamics
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 the solar neighbourhood, The result is consistent with simple disc-hearing models that predict ratios of sigma(z)/sigma(R) less than one.
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