University of Illinois Urbana-Champaign

Molecular Spectral Lines In Filamentary Infrared Dark Clouds

Lu, Xing

Content Files
TF11_Abstract.pdf
TF11_Abstract.txt
TF11_Presentation.pptx

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https://hdl.handle.net/2142/50877

Description

Title
Molecular Spectral Lines In Filamentary Infrared Dark Clouds
Author(s)
Lu, Xing
Contributor(s)
  • Liu, Hauyu Baobab
  • Zhang, Qizhou
Issue Date
2014-06-17
Keyword(s)
Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA
Date of Ingest
  • 2014-09-17T16:55:16Z
  • 2015-04-14T18:40:34Z
Abstract
Many infrared dark clouds (IRDCs) in our Galaxy have filamentary structures, and some of them present converging filaments to a central hub, known as hub-filament systems (HFSs). These filaments could play a crucial role in feeding gas to the star forming regions at the hub. We analyzed NH$_3$ (J,K)=(1,1) and (2,2) spectral lines data obtained with the Very Large Array (VLA) towards five filamentary IRDCs, and derived the gas temperature based on the line ratios. Furthermore, with the Submillimeter Array (SMA) in the compact and sub-compact configurations, we obtained dust emission and spectra lines at 1.3 mm towards these sources. We found filamentary structures in both dust continuum and spectral line emission, with a characteristic width of 0.1 pc and length of 1 pc. The dust emission is consistent with the infrared extinction features, indicating the existence of dense and cold gas, while massive dust cores are usually associated with the hubs. Complex organic molecules including CH$_3$OH are found towards the dust cores. In particular, optically-thin intermediate density gas tracers, such as C$^{18}$O, reveal a possible trend of gas infall along filaments towards hubs. This is consistent with the scenario that dense gas is accreted onto dense cores through filaments and form high-mass star clusters.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
English
Permalink
http://hdl.handle.net/2142/50877
DOI
https://doi.org/10.15278/isms.2014.TF11
Copyright and License Information
Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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Abstracts & Presentations - 2014 International Symposium on Molecular Spectroscopy PRIMARY