Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.316..795d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 316, Issue 4, pp. 795-802.
Astronomy and Astrophysics
Astronomy
13
Instrumentation: Spectrographs, Techniques: Radial Velocities, Planetary Nebulae: General, Galaxies: Individual: M94, Galaxies: Individual: Ngc 4736, Galaxies: Kinematics And Dynamics
Scientific paper
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.
Douglas Nigel G.
Gerssen Joris
Kuijken Koen
Merrifield Michael R.
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