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Difference of the Gas Density Histograms in and out of spiral arms in Milky Way Galaxy

Published online by Cambridge University Press:  13 January 2020

Toshihiro Handa ,
Miru Maebata ,
Takeru Murase ,
Shinji Fujita ,
Mikito Kohno ,
Nario Kuno ,
Mika Kuriki ,
Mitsuhiro Matsuo ,
Tetsuhiro Minamidani  and
Atsushi Nishimura
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Toshihiro Handa
Affiliation:
School of Science & Engineering, Kagoshima university, Korimoto 1-21-35, Kagoshima, Kagoshima 890-0065, Japan, email: handa@sci.kagoshima-u.ac.jp
Miru Maebata
Affiliation:
School of Science & Engineering, Kagoshima university, Korimoto 1-21-35, Kagoshima, Kagoshima 890-0065, Japan, email: handa@sci.kagoshima-u.ac.jp
Takeru Murase
Affiliation:
School of Science & Engineering, Kagoshima university, Korimoto 1-21-35, Kagoshima, Kagoshima 890-0065, Japan, email: handa@sci.kagoshima-u.ac.jp
Shinji Fujita
Affiliation:
Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
Mikito Kohno
Affiliation:
Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
Nario Kuno
Affiliation:
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan.
Mika Kuriki
Affiliation:
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan.
Mitsuhiro Matsuo
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki 462-2, Minamisaku, Nagano 384-1305, Japan.
Tetsuhiro Minamidani
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki 462-2, Minamisaku, Nagano 384-1305, Japan.
Atsushi Nishimura
Affiliation:
Department of Astrophysics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
Kazufumi Torii
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki 462-2, Minamisaku, Nagano 384-1305, Japan.
Yuya Tsuda
Affiliation:
Meisei University, Hodokubo, Hino, Tokyo 191-0042, Japan.
Tomofumi Umemoto
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki 462-2, Minamisaku, Nagano 384-1305, Japan.
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Abstract

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“Gas Density Histogram (GDH)” is an observational counterpart of the probability density function (PDF) of the gas density of interstellar medium (ISM). We used 12CO data in (l, b) = (29°, 0) region from “FOREST unbiased galactic imaging survey with Nobeyama 45-m telescope (FUGIN)”, which is a large coverage survey in three CO (1-0) lines. Using the kinetic distance, we estimated the volume density of the voxel from the observed column density. The resultant GDHs of the inter-arm regions show lognormal or lognormal-like, but those in the spiral arm regions show flat-top shape.

Keywords

ISM: evolutionradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 322 - 323
Copyright
© International Astronomical Union 2020 

References

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