The carbon inventory in a quiescent, filamentary molecular cloud in G328
Extent: 8 p. We present spectral line images of [C I] 809 GHz, CO J = 1-0 115 GHz and H I 1.4 GHz line emission, and calculate the corresponding C, CO and H column densities, for a sinuous, quiescent giant molecular cloud about 5 kpc distant along the l = 328° sightline (hereafter G328) in our Galax...
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Online Access: | http://hdl.handle.net/2440/82889 https://doi.org/10.1088/0004-637X/782/2/72 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/82889 2023-12-24T10:11:21+01:00 The carbon inventory in a quiescent, filamentary molecular cloud in G328 Burton, M. Ashley, M. Braiding, C. Storey, J. Kulesa, C. Hollenbach, D. Wolfire, M. Gluck, C. Rowell, G. Institute for Photonics & Advanced Sensing (IPAS) 2014 http://hdl.handle.net/2440/82889 https://doi.org/10.1088/0004-637X/782/2/72 en eng Institute of Physics http://purl.org/au-research/grants/arc/DP120101585 The Astrophysical Journal: an international review of astronomy and astronomical physics, 2014; 782(2):1-8 0004-637X 1538-4357 http://hdl.handle.net/2440/82889 doi:10.1088/0004-637X/782/2/72 Rowell, G. [0000-0002-9516-1581] © 2014.The American Astronomical Society. All rights reserved. http://dx.doi.org/10.1088/0004-637x/782/2/72 ISM: abundances ISM: clouds ISM: molecules ISM: structure radio lines: ISM telescopes Journal article 2014 ftunivadelaidedl https://doi.org/10.1088/0004-637X/782/2/7210.1088/0004-637x/782/2/72 2023-11-27T23:18:44Z Extent: 8 p. We present spectral line images of [C I] 809 GHz, CO J = 1-0 115 GHz and H I 1.4 GHz line emission, and calculate the corresponding C, CO and H column densities, for a sinuous, quiescent giant molecular cloud about 5 kpc distant along the l = 328° sightline (hereafter G328) in our Galaxy. The [C I] data comes from the High Elevation Antarctic Terahertz telescope, a new facility on the summit of the Antarctic plateau where the precipitable water vapor falls to the lowest values found on the surface of the Earth. The CO and H I data sets come from the Mopra and Parkes/ATCA telescopes, respectively. We identify a filamentary molecular cloud, ~75 × 5 pc long with mass ~4 × 104 M ☉ and a narrow velocity emission range of just 4 km s–1. The morphology and kinematics of this filament are similar in CO, [C I], and H I, though in the latter appears as self-absorption. We calculate line fluxes and column densities for the three emitting species, which are broadly consistent with a photodissociation region model for a GMC exposed to the average interstellar radiation field. The [C/CO] abundance ratio averaged through the filament is found to be approximately unity. The G328 filament is constrained to be cold (T Dust < 20 K) by the lack of far-IR emission, to show no clear signs of star formation, and to only be mildly turbulent from the narrow line width. We suggest that it may represent a GMC shortly after formation, or perhaps still in the process of formation. Michael G. Burton, Michael C. B. Ashley, Catherine Braiding, John W. V. Storey, Craig Kulesa, David J. Hollenbach, Mark Wolfire, Christian Glück and Gavin Rowell Article in Journal/Newspaper Antarc* Antarctic The University of Adelaide: Digital Library Antarctic The Antarctic Burton ENVELOPE(166.733,166.733,-72.550,-72.550) The Astrophysical Journal 782 2 72 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
ISM: abundances ISM: clouds ISM: molecules ISM: structure radio lines: ISM telescopes |
spellingShingle |
ISM: abundances ISM: clouds ISM: molecules ISM: structure radio lines: ISM telescopes Burton, M. Ashley, M. Braiding, C. Storey, J. Kulesa, C. Hollenbach, D. Wolfire, M. Gluck, C. Rowell, G. The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
topic_facet |
ISM: abundances ISM: clouds ISM: molecules ISM: structure radio lines: ISM telescopes |
description |
Extent: 8 p. We present spectral line images of [C I] 809 GHz, CO J = 1-0 115 GHz and H I 1.4 GHz line emission, and calculate the corresponding C, CO and H column densities, for a sinuous, quiescent giant molecular cloud about 5 kpc distant along the l = 328° sightline (hereafter G328) in our Galaxy. The [C I] data comes from the High Elevation Antarctic Terahertz telescope, a new facility on the summit of the Antarctic plateau where the precipitable water vapor falls to the lowest values found on the surface of the Earth. The CO and H I data sets come from the Mopra and Parkes/ATCA telescopes, respectively. We identify a filamentary molecular cloud, ~75 × 5 pc long with mass ~4 × 104 M ☉ and a narrow velocity emission range of just 4 km s–1. The morphology and kinematics of this filament are similar in CO, [C I], and H I, though in the latter appears as self-absorption. We calculate line fluxes and column densities for the three emitting species, which are broadly consistent with a photodissociation region model for a GMC exposed to the average interstellar radiation field. The [C/CO] abundance ratio averaged through the filament is found to be approximately unity. The G328 filament is constrained to be cold (T Dust < 20 K) by the lack of far-IR emission, to show no clear signs of star formation, and to only be mildly turbulent from the narrow line width. We suggest that it may represent a GMC shortly after formation, or perhaps still in the process of formation. Michael G. Burton, Michael C. B. Ashley, Catherine Braiding, John W. V. Storey, Craig Kulesa, David J. Hollenbach, Mark Wolfire, Christian Glück and Gavin Rowell |
author2 |
Institute for Photonics & Advanced Sensing (IPAS) |
format |
Article in Journal/Newspaper |
author |
Burton, M. Ashley, M. Braiding, C. Storey, J. Kulesa, C. Hollenbach, D. Wolfire, M. Gluck, C. Rowell, G. |
author_facet |
Burton, M. Ashley, M. Braiding, C. Storey, J. Kulesa, C. Hollenbach, D. Wolfire, M. Gluck, C. Rowell, G. |
author_sort |
Burton, M. |
title |
The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
title_short |
The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
title_full |
The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
title_fullStr |
The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
title_full_unstemmed |
The carbon inventory in a quiescent, filamentary molecular cloud in G328 |
title_sort |
carbon inventory in a quiescent, filamentary molecular cloud in g328 |
publisher |
Institute of Physics |
publishDate |
2014 |
url |
http://hdl.handle.net/2440/82889 https://doi.org/10.1088/0004-637X/782/2/72 |
long_lat |
ENVELOPE(166.733,166.733,-72.550,-72.550) |
geographic |
Antarctic The Antarctic Burton |
geographic_facet |
Antarctic The Antarctic Burton |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://dx.doi.org/10.1088/0004-637x/782/2/72 |
op_relation |
http://purl.org/au-research/grants/arc/DP120101585 The Astrophysical Journal: an international review of astronomy and astronomical physics, 2014; 782(2):1-8 0004-637X 1538-4357 http://hdl.handle.net/2440/82889 doi:10.1088/0004-637X/782/2/72 Rowell, G. [0000-0002-9516-1581] |
op_rights |
© 2014.The American Astronomical Society. All rights reserved. |
op_doi |
https://doi.org/10.1088/0004-637X/782/2/7210.1088/0004-637x/782/2/72 |
container_title |
The Astrophysical Journal |
container_volume |
782 |
container_issue |
2 |
container_start_page |
72 |
_version_ |
1786163745707261952 |