Abstract

AbstractWe have used the Wide Field Spectrograph on the Australian National University 2.3-m telescope to perform the integral field spectroscopy for a sample of the Galactic planetary nebulae. The spatially resolved velocity distributions of the Hα emission line were used to determine the kinematic features and nebular orientations. Our findings show that some bulge planetary nebulae toward the Galactic center have a particular orientation.

Highlights

  • The majority of planetary nebulae (PNe) show predominantly axisymmetric morphologies, i.e. elliptical and bipolar

  • The major axes of bipolar PNe are assumed to be perfectly aligned with the angular momentum vectors of their central stars, so a population of bipolar Galactic PNe can be used to determine the angular momentum distribution of the local stars within the Galaxy

  • Recent studies showed that some bipolar PNe within the bulge near the Galactic center have a homogeneous orientation (Weidmann & Dıaz 2008; Rees & Zijlstra 2013)

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Summary

Introduction

The majority of planetary nebulae (PNe) show predominantly axisymmetric morphologies, i.e. elliptical and bipolar. PN as a test particle can be used to trace the dynamics of the Galaxy. The major axes of bipolar PNe are assumed to be perfectly aligned with the angular momentum vectors of their central stars, so a population of bipolar Galactic PNe can be used to determine the angular momentum distribution of the local stars within the Galaxy.

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