Report
A Search for Small-Scale Clumpiness in Dense Cores of Molecular Clouds
| العنوان: | A Search for Small-Scale Clumpiness in Dense Cores of Molecular Clouds |
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| المؤلفون: | Pirogov, L. E., Zinchenko, I. I. |
| المصدر: | Astron.Rep.52:963-975,2008 |
| سنة النشر: | 2009 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Galaxy Astrophysics |
| الوصف: | We have analyzed HCN(1-0) and CS(2-1) line profiles obtained with high signal-to-noise ratios toward distinct positions in three selected objects in order to search for small-scale structure in molecular cloud cores associated with regions of high-mass star formation. In some cases, ripples were detected in the line profiles, which could be due to the presence of a large number of unresolved small clumps in the telescope beam. The number of clumps for regions with linear scales of ~0.2-0.5 pc is determined using an analytical model and detailed calculations for a clumpy cloud model; this number varies in the range: ~2 10^4-3 10^5, depending on the source. The clump densities range from ~3 10^5-10^6 cm^{-3}, and the sizes and volume filling factors of the clumps are ~(1-3) 10^{-3} pc and ~0.03-0.12. The clumps are surrounded by inter-clump gas with densities not lower than ~(2-7) 10^4 cm^{-3}. The internal thermal energy of the gas in the model clumps is much higher than their gravitational energy. Their mean lifetimes can depend on the inter-clump collisional rates, and vary in the range ~10^4-10^5 yr. These structures are probably connected with density fluctuations due to turbulence in high-mass star-forming regions. Comment: 23 pages including 4 figures and 4 tables |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1134/S1063772908120020 |
| URL الوصول: | http://arxiv.org/abs/0903.4280 |
| رقم الانضمام: | edsarx.0903.4280 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1134/S1063772908120020 |
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