Paper:	The AMANOGAWA-2SB Surevey and the Gas Density Histogram of Milky Way Galaxy to Address the Origin of the Density Structure of ISM
Volume:	458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way
Page:	221
Authors:	Handa, T.; Yoda, T.; Kohno, K.; Morino, J.-i.; Nakajima, T.; Kuno, N.; Ogawa, H.; Kimura, K.
Abstract:	We made a Galactic plane survey in both 12CO(2-1) and 13CO(2-1) with 9 arcmin resolution. It covers the largest area on the sky in these lines with denser sampling than the beam size. Using the survey data we derived the gas density histogram of the galactic disk in the 20-pc scale, which corresponds to the probability distribution function of a stochastic process. The derived histogram is log-normal. It suggests the current gas density structure is a result of many density modulations which happens randomly without any characteristic scale.

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