期刊
ASTRONOMY & ASTROPHYSICS
卷 576, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201525650
关键词
ISM: clouds; dust, extinction; ISM: structure; methods: data analysis
资金
- PRIN MIUR
In this Letter we investigate the shape of the probability distribution of column densities (PDF) in molecular clouds. Through the use of low-noise, extinction-calibrated Herschel/Planck emission data for eight molecular clouds, we demonstrate that, contrary to common belief, the PDFs of molecular clouds are not described well by log-normal functions, but are instead power laws with exponents close to two and with breaks between A(K) similar or equal to 0.1 and 0.2 mag, so close to the CO self-shielding limit and not far from the transition between molecular and atomic gas. Additionally, we argue that the intrinsic functional form of the PDF cannot be securely determined below A(K) similar or equal to 0.1 mag, limiting our ability to investigate more complex models for the shape of the cloud PDF.
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