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Planetary nebulae as kinematic tracers of galaxy stellar halos

Published online by Cambridge University Press:  08 August 2017

Lodovico Coccato
Lodovico Coccato*
Affiliation:
European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching, Germany. email: lcoccato@eso.org
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Abstract

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The kinematic and dynamical properties of galaxy stellar halos are difficult to measure because of the faint surface brightness that characterizes these regions. Spiral galaxies can be probed using the radio Hi emission; on the contrary, early-type galaxies contain less gas, therefore alternative kinematic tracers need to be used. Planetary nebulae (PNe) can be easily detected far out in the halo thanks to their bright emission lines. It is therefore possible to map the halo kinematics also in early-type galaxies, typically out to 5 effective radii or beyond. Thanks to the recent spectroscopic surveys targeting extra-galactic PNe, we can now rely on a few tens of galaxies where the kinematics of the stellar halos are measured. Here, I will review the main results obtained in this field in the last decades.

Keywords

galaxies: generalgalaxies: haloesgalaxies: kinematics and dynamicsISM Planetary Nebuale: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 271 - 278
Copyright
Copyright © International Astronomical Union 2017 

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