Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-05T12:44:31.443Z Has data issue: false hasContentIssue false

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
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
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Poster Paper
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

Ballesteros-Paredes, J., Vázquez-Semadeni, E., Gazol, A., et al 2011, MNRAS, 416, 1436 10.1111/j.1365-2966.2011.19141.xCrossRefGoogle Scholar
Pineda, J. L., Goldsmith, P. F., Chapman, N., et al 2010, ApJ, 721, 686 10.1088/0004-637X/721/1/686CrossRefGoogle Scholar
Takekoshi, T., Fujita, S., Nishimura, A., et al 2019, ApJ, 883, 156 10.3847/1538-4357/ab3a55CrossRefGoogle Scholar
Urquhart, J. S., Hoare, M. G., Purcell, C. R., et al 2009, A&A, 501, 539 Google Scholar
Vázquez-Semadeni, E. 1994, ApJ, 423, 681 10.1086/173847CrossRefGoogle Scholar
Wilson, T. L., & Rood, R. 1994, ARA&A, 32, 191 Google Scholar
Yamagishi, M., Nishimura, A., Fujita, S., et al 2018, ApJS, 235, 910.3847/1538-4365/aaab4bCrossRefGoogle Scholar