Filamentary Hierarchies and Superbubbles I: Characterizing filament properties across a simulated spiral galaxy

Abstract

High resolution surveys reveal that the interstellar medium in the Milky Way and nearby galaxies consists of interlinked hierarchies of filamentary structure and superbubbles extending from galactic to subpc scales. The characterization of filament properties across this hierarchy is of fundamental importance for the origin of giant molecular clouds and their star clusters. In this paper we characterize the properties of filaments greater than 25 pc in length that are produced in the multi-scale galactic MHD simulations of Zhao et al. 2024. By adapting the FilFinder algorithm of Koch & Rosolowsky, 2015, we extract over 500 filaments ranging up to 10 kpc scales, to derive the probability distribution functions for filament masses and lengths, magnetic field orientations, and the gravitational stability and fragmentation patterns of filaments. We find power-law distributions for filament masses and lengths. The former has a power law index ${\alpha }_m=1.85$ that is nearly identical to that of observed GMC mass functions in extragalactic and Galactic surveys, suggesting that GMC properties are inherited from their host filaments. The fragmentation of magnetized filaments on 200 pc scales or less occurs when they exceed an average critical line mass, as predicted by theory. On larger scales however, kpc filaments form out of the cold neutral medium (CNM) and fragmentation follows local variations in the critical line mass along spiral arms or at the boundaries of superbubbles.

This text has been updated to include an erratum to the article concerning the masses of filaments. Erratum will also be linked to the article on the journal webpage. 31 pages, 19 figures, accepted to ApJ

References in corpus (33)

• Filamentary structure of star-forming complexes
• Physical properties of molecular clouds for the entire Milky Way disk
• Cold molecular gas in the Perseus cluster core - Association with X-ray cavity, Halpha filaments and cooling flow -
• Large-scale filaments associated with Milky Way spiral arms
• Giant Molecular Cloud Catalogues for PHANGS-ALMA: Methods and Initial Results
• The Bones of the Milky Way
• The dynamics and outcome of star formation with jets, radiation, winds, and supernovae in concert
• Molecular Cloud Populations in the Context of Their Host Galaxy Environments: A Multiwavelength Perspective
• The Cloud Factory I: Generating resolved filamentary molecular clouds from galactic-scale forces
• Mapping the Magnetic Interstellar Medium in Three Dimensions Over the Full Sky with Neutral Hydrogen
• The Hi-GAL catalogue of dusty filamentary structures in the Galactic Plane
• Effects of the environment and feedback physics on the initial mass function of stars in the STARFORGE simulations
• The integrated properties of the molecular clouds from the JCMT CO(3-2) High Resolution Survey
• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• Interstellar filaments and star formation
• The role of galactic dynamics in shaping the physical properties of giant molecular clouds in Milky Way-like galaxies
• Molecular Gas Along a Bright H-alpha Filament in 2A 0335+096 Revealed by ALMA
• The anatomy of a star-forming galaxy: Pressure-driven regulation of star formation in simulated galaxies
• On the typical width of Herschel filaments
• The Galactic dynamics revealed by the filamentary structure in atomic hydrogen emission
• PHANGS-JWST First Results: The Dust Filament Network of NGC 628 and its Relation to Star Formation Activity
• Dynamical Accretion Flows -- ALMAGAL: Flows along filamentary structures in high-mass star-forming clusters
• Witnessing the fragmentation of a filament into prestellar cores in Orion B/NGC 2024
• A Kpc Scale Molecular Wave in the Inner Galaxy: Feather of the Milky Way?
• Molecular gas along the old radio jets of the cluster-central type 2 quasar IRAS 09104+4109
• Emergence of high-mass stars in complex fiber networks (EMERGE). I. Early ALMA Survey: observations and massive data reduction
• On the evolution of the observed Mass-to-Length relationship for star-forming filaments
• Massive Prestellar Cores in Radiation-magneto-turbulent Simulations of Molecular Clouds
• Necessary conditions for the formation of filaments and star clusters in the cold neutral medium
• Hierarchical hub-filament structures and gas inflows on galaxy-cloud scales
• Effects of stellar feedback on cores in STARFORGE
• Bimodal Star Formation in Simulations of Strongly Magnetized Giant Molecular Clouds
• The SARAO MeerKAT Galactic Plane Survey filamentary source catalogue

Cited by in corpus (1)

• Revealing the Connection Between the Filamentary Hierarchy and Star Cluster Formation in a Simulated NGC 628 Galaxy