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29 March 2024
 
  » arxiv » 1607.7452

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Investigating the structure and fragmentation of a highly filamentary IRDC
J. D. Henshaw ; P. Caselli ; F. Fontani ; I. Jimenez-Serra ; J. C. Tan ; S. N. Longmore ; J. E. Pineda ; R. J. Parker ; A. T. Barnes ;
Date 25 Jul 2016
AbstractWe present 3.7 arcsec (~0.05 pc) resolution 3.2 mm dust continuum observations from the IRAM PdBI, with the aim of studying the structure and fragmentation of the filamentary Infrared Dark Cloud G035.39-00.33. The continuum emission is segmented into a series of 13 quasi-regularly spaced (~0.18pc) cores, following the major axis of the IRDC. We compare the spatial distribution of the cores with that predicted by theoretical work describing the fragmentation of hydrodynamic fluid cylinders, finding a significant (factor of ~8) discrepancy between the two. Our observations are consistent with the picture emerging from kinematic studies of molecular clouds suggesting that the cores are harboured within a complex network of independent sub-filaments. This result emphasises the importance of considering the underlying physical structure, and potentially, dynamically important magnetic fields, in any fragmentation analysis. The identified cores exhibit a range in (peak) beam-averaged column density ($3.6{ m x}10^{23}{ m cm}^{-2}<N_{H,c}<8.0{ m x}10^{23}{ m cm}^{-2}$), mass ($8.1M_{odot}<M_{c}<26.1M_{odot}$), and number density ($6.1{ m x}10^{5}{ m cm}^{-3}<n_{H, c, eq}<14.7{ m x}10^{5}{ m cm}^{-3}$). Two of these cores, dark in the mid-infrared, centrally-concentrated, monolithic (with no traceable substructure at our PdBI resolution), and with estimated masses of the order ~20-25$M_{odot}$, are good candidates for the progenitors of intermediate-to-high-mass stars. Virial parameters span a range $0.2<alpha_{ m vir}<1.3$. Without additional support, possibly from dynamically important magnetic fields with strengths of the order 230$mu$G<B<670$mu$G, the cores are susceptible to gravitational collapse. These results may imply a multi-layered fragmentation process, which incorporates the formation of sub-filaments, embedded cores, and the possibility of further fragmentation.
Source arXiv, 1607.7452
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