2015A&A...576L...1L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.18CEST10:43:51

2015A&A...576L...1L - Astronomy and Astrophysics, volume 576, L1-1 (2015/4-1)

Molecular clouds have power-law probability distribution functions.

LOMBARDI M., ALVES J. and LADA C.J.

Abstract (from CDS):

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 AK≃0.1 and 0.2mag, 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 AK≃0.1mag, limiting our ability to investigate more complex models for the shape of the cloud PDF.

Abstract Copyright:

Journal keyword(s): ISM: clouds - dust, extinction - ISM: structure - methods: data analysis

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Polaris Cirrus Cloud MoC 01 52 29.6 +87 40 31           ~ 72 0
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1131 0
3 NAME California Molecular Cloud MoC 04 10.0 +39 00           ~ 108 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3680 0
5 NAME Ori A MoC 05 38 -07.1           ~ 2757 0
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1217 0
7 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
8 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1

    Equat.    Gal    SGal    Ecl

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2021.04.18-10:43:51

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