تقرير
What can we learn about the kinematics of bright extragalactic planetary nebulae
| العنوان: | What can we learn about the kinematics of bright extragalactic planetary nebulae |
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| المؤلفون: | Richer, M. G., Baez, S. -H., Lopez, J. A., Riesgo, H., Garcia-Diaz, Ma. T. |
| سنة النشر: | 2009 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Galaxy Astrophysics, Astrophysics - Cosmology and Extragalactic Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We present high resolution spectroscopy in the [\ion{O}{3}]$\lambda$5007 and H$\alpha$ lines of bright planetary nebulae in the Milky Way bulge and the dwarf galaxies M32, Fornax, Sagittarius, and NGC 6822 obtained at the Observatorio Astronomico Nacional in the Sierra San Pedro Martir using the Manchester Echelle Spectrograph. We use the high signal-to-noise (S/N) observations of Milky Way bulge planetary nebulae to explore what kinematic information can be determined reliably when observing extragalactic planetary nebulae in the [\ion{O}{3}]$\lambda$5007 line at modest S/N. We find that the intrinsic line widths measured in [\ion{O}{3}]$\lambda$5007 and H$\alpha$ are very similar. Over the range of S/N available in this sample, the line width we measure is independent of the S/N. Finally, deviations from a Gaussian line shape are small. Thus, the line width of the [\ion{O}{3}]$\lambda$5007 line in bright extragalactic planetary nebulae should reflect the kinematics of most of the mass in the ionized nebular shell. Comment: accepted for publication in the october 2009 issue of Revista Mexicana de Astronomia y Astrofisica |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/0908.2111 |
| رقم الأكسشن: | edsarx.0908.2111 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |