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The density structure of molecular cloud scales: A fitting for N-PDF with multi log-normal functions

Published online by Cambridge University Press:  09 June 2023

Takeru Murase Open the ORCID record for Takeru Murase [Opens in a new window] ,
Toshihiro Handa Open the ORCID record for Toshihiro Handa [Opens in a new window] ,
Ren Matsusaka Open the ORCID record for Ren Matsusaka [Opens in a new window] ,
Yoshito Shimajiri ,
Masato I.N. Kobayashi ,
Mikito Kohno ,
Junya Nishi ,
Norimi Takeba Open the ORCID record for Norimi Takeba [Opens in a new window]  and
Yosuke Shibata
Takeru Murase
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
Toshihiro Handa
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan Amanogawa Galaxy Astronomy Research center, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima, 890-0065, Japan
Ren Matsusaka
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
Yoshito Shimajiri
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo, 181-8588, Japan Laboratoire d’Astrophysique (AIM), CEA/DRF, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France Kyushu Kyoritsu Univ., Jiyugaoka 1-8, Yahatanishi-ku, Kitakyushu, Fukuoka, 807-8585, Japan
Masato I.N. Kobayashi
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo, 181-8588, Japan
Mikito Kohno
Affiliation:
Astronomy Section, Nagoya City Science Museum, 2-17-1 Sakae, Naka-ku, Nagoya, Aichi, 460-0008, Japan Department of Physics, Graduate School of Science, Nagoya Univ., Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8602, Japan
Junya Nishi
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
Norimi Takeba
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
Yosuke Shibata
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima Univ., 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
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Abstract

We studied the probability distribution function of the column density (N-PDF) of molecular clouds based on a fit with a multi-log-normal function using the Nobeyama 45-m Cygnus X CO survey data. We identified 124 molecular clouds in 13CO data using the DENDROGRAM and SCIMES algorithms. The N-PDF was constructed for 11 extended (≥ 0.4 deg2) molecular clouds of these identified clouds. We found that every N-PDF is well-fitted with one or two log-normal (LN) distributions. We investigated the distributions of the column density, C18O dense cores, and radio continuum source in each cloud and found that the N-PDF was less correlated with the star-forming activity. The LN N-PDF parameters showed two impressive features. First, the LN distribution at the low-density part had the same mean column density (∼1021.5 cm−2 ) for almost all the molecular clouds. Second, the wider LN distribution tended to show the lower mean density of the structures.

Keywords

ISM: cloudsISM: structureISM: moleculesmethods: analyticalstars: formation
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 45 - 48
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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