NGC 6153: Reality is complicated
Michael G. Richer, Anabel Arrieta, Lorena Arias, Lesly Casta\~neda, Carlos, Silvia Torres-Peimbert, Jos\'e Alberto L\'opez, Adolfo Galindo

TL;DR
This study reveals the complex plasma structure and kinematics of NGC 6153, showing multiple plasma components with distinct temperatures, densities, and chemical abundances, influenced by various physical processes.
Contribution
It provides a detailed analysis of the plasma components and their kinematics in NGC 6153, highlighting the importance of considering multiple physical processes in nebular studies.
Findings
Two plasma components with different temperatures and densities.
The additional plasma contains about half of the N^{2+} and O^{2+} ions but only 3-5% of H^+ mass.
The normal plasma shows temperature fluctuations in the main shell.
Abstract
We study the kinematics of emission lines that arise from many physical processes in NGC 6153 based upon deep, spatially-resolved, high resolution spectra acquired with the UVES spectrograph at the ESO VLT. Our most basic finding is that the plasma in NGC 6153 is complex, especially its temperature structure. The kinematics of most emission lines defines a classic expansion law, with the outer part expanding fastest (normal nebular plasma). However, the permitted lines of \ion{O}{1}, \ion{C}{2}, \ion{N}{2}, \ion{O}{2}, and \ion{Ne}{2} present a constant expansion velocity that defines a second kinematic component (additional plasma component). The physical conditions imply two plasma components, with the additional plasma component having lower temperature and higher density. The [\ion{O}{2}] density and the [\ion{N}{2}] temperature are anomalous, but may be understood considering the…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
