Astrophysics > Astrophysics of Galaxies
[Submitted on 30 Nov 2016]
Title:Planetary nebulae as kinematic tracers of galaxy stellar halos
View PDFAbstract: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.
Submission history
From: Lodovico Coccato [view email][v1] Wed, 30 Nov 2016 14:55:41 UTC (1,087 KB)
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