A census of 163 large-scale (>=10pc), velocity-coherent filaments in the inner Galactic plane physical properties, dense-gas fraction, and association with spiral arms. (2022)
Keywords :
Catalogs ; Interstellar filaments ; Galaxy structure ; Star formation ; Interstellar clouds
Abstract:The interstellar medium has a highly filamentary and hierarchical structure that may play a significant role in star formation. A systematical study of the large-scale filaments toward their physical parameters, distribution, structures, and kinematics will inform us about which types of filaments have the potential to form stars, how the material feeds protostars through filaments, and the connection between star formation and Galactic spiral arms. Unlike the traditional by-eye searches, we use a customized minimum spanning tree algorithm to identify filaments by linking Galactic clumps from the APEX Telescope Large Area Survey of the Galaxy catalog. In the inner Galactic plane (|l|<60{deg}), we identify 163 large-scale filaments
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The filaments are identified from ATLASGAL
(Urquhart+ 2018, J/MNRAS/473/1059) clumps using the minimum spanning
tree (MST) method developed by Wang et al. (2016ApJS..226....9W).
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