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EPoS |
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EPoS Contribution
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On the formation of dense fibers in molecular clouds
Francesca Bonanomi IfA UVienna, Vienna, AT | |
| The presence of fibers in N2H+(1-0) has been detected above densities of ~105 cm-3 (~1022 cm-2) in star-forming (SF) regions such as OMC-3. These fibers are the velocity-coherent substructures of pc-scale filaments characterized by subsonic motion. In this work, we investigate how the diffuse and turbulent gas material connects to those dense fibers, thus exploring the transition between different gas density regimes within clouds. HNC(1-0), detected down to densities of 5x1021 cm-2, becomes a key tool to probe this diffuse gas. We investigated the HNC(1-0) emission in a sample of 5 SF regions in Orion, part of the EMERGE Early ALMA Survey, observed at ~2000 au resolution. We have characterized the environment surrounding the fibers through the investigation of the diffuse gas kinematics, such as velocity dispersion and turbulence regime. By exploring those gas properties in both low and high- mass SF regions we aim to investigate the origin of fibers in different environments. We will present the first results of this analysis and their comparison with both turbulence and accretion models. | |
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| Caption: Molecular integrated intensity maps in OMC-3: (Left) N2H+(1-0) map, (Right) HNC(1-0) map. The black contour shows the N2H+(1-0) emission at ~10 K*km/s. The fibers detected by N2H+(1-0) in this region are marked by colored segments. The map displays the distribution of the diffuse gas traced by HNC(1-0) surrounding the fibers. In this work we analyzed the diffuse gas kinematics to investigate how it connects and forms dense structures. | |
| Collaborators: A. Hacar, IFA, AT A. Socci, IFA, AT |
Relevant topic(s): Filaments Molecular Clouds |
| Relevant Big Question: How do fibers form inside molecular clouds? | |