期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 316, 期 4, 页码 795-802出版社
BLACKWELL SCIENCE LTD
DOI: 10.1046/j.1365-8711.2000.03574.x
关键词
instrumentation : spectrographs; techniques : radial velocities; planetary nebulae : general; galaxies : individual : M94 galaxies : individual : NGC 4736; galaxies : kinematics and dynamics
The planetary nebula populations of relatively nearby galaxies can be easily observed and provide both a distance estimate and a tool with which dynamical information can be obtained. Usually the requisite radial velocities are obtained by multi-object spectroscopy once the planetary nebulae have been located by direct imaging. Here we report on a technique for measuring planetary nebula kinematics using the double-beam ISIS spectrograph at the William Herschel Telescope in a novel slitless mode, which enables the detection and radial velocity measurements to be combined into a single step. The results on our first target, the Sab galaxy NGC 4736, allow the velocity dispersion of the stellar population in a disc galaxy to be traced out to four scalelengths for the first time and are consistent with a simple isothermal sheet model.
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