Understanding the Kinetic Energy deposition within Molecular Clouds

2023/09/16 by Yuan, Lixia, Yang, Ji, Du, Fujun +8 · 1 citation
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR)

paper · doi:10.48550/arxiv.2309.08998

Abstract

According to the structures traced by ¹³CO spectral lines within the ¹²CO molecular clouds (MCs), we investigate the contributions of their internal gas motions and relative motions to the total velocity dispersions of ¹²CO MCs. Our samples of 2851 ¹²CO MCs harbor a total of 9556 individual ¹³CO structures, among which 1848 MCs (∼ 65%) have one individual ¹³CO structure and the other 1003 MCs (∼ 35%) have multiple ¹³CO structures. We find that the contribution of the relative motion between ¹³CO structures (σ_{\rm ¹³CO, re}) is larger than that from their internal gas motion (σ_{\rm ¹³CO, in}) in ∼ 62% of 1003 MCs in the `multiple' regime. In addition, we find the σ_{\rm ¹³CO, re} tends to increase with the total velocity dispersion(σ_{\rm ¹²CO, tot}) in our samples, especially for the MCs having multiple ¹³CO structures. This result provides a manifestation of the macro-turbulent within MCs, which gradually becomes the dominant way to store the kinetic energy along with the development of MC scales.

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