The Planetary Nebulae Spectrograph: the green light for Galaxy Kinematics

Details The Planetary Nebulae Spectrograph: the green light for Galaxy Kinematics The Planetary Nebulae Spectrograph: the green light for Galaxy Kinematics

2002-08-07

arxiv.org/abs/astro-ph/0208149v1

Astronomy and Astrophysics

Astrophysics

Accepted by PASP, to appear November 2002; the figures have been degraded for archival purposes

Scientific paper

10.1086/342765

Planetary nebulae are now well established as probes of galaxy dynamics and as standard candles in distance determinations. Motivated by the need to improve the efficiency of planetary nebulae searches and the speed with which their radial velocities are determined, a dedicated instrument - the Planetary Nebulae Spectrograph or PN.S - has been designed and commissioned at the 4.2m William Herschel Telescope. The high optical efficiency of the spectrograph results in the detection of typically ~ 150 PN in galaxies at the distance of the Virgo cluster in one night of observations. In the same observation the radial velocities are obtained with an accuracy of ~ 20 km/s

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