Papers Presented at the IAU Symposium No. 146 on "Dynamics of Galaxies and Molecular Cloud Distribution" PDF Download
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Author: Lars E. B. Johansson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Lars E. B. Johansson
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author:
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Category : Physics
Languages : en
Pages : 1116
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Author: Björn Sundelius
Publisher: Coronet Books
ISBN:
Category : Science
Languages : en
Pages : 426
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Author: 国立国会図書館 (Japan)
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Category : Science
Languages : en
Pages : 1762
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Category : Aeronautics
Languages : en
Pages : 1460
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: British Library. Document Supply Centre
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Category : Conference proceedings
Languages : en
Pages : 868
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Category : Science
Languages : en
Pages : 1092
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Category : Aeronautics
Languages : en
Pages : 508
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Category : Government reports announcements & index
Languages : en
Pages : 1768
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Author: Josh Machado
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Category : Galaxies
Languages : en
Pages : 0
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We measure the spacing and clustering of \numGMCs~CO peaks identified from 150~pc resolution CO~(2-1) maps of \numGalaxies~ nearby galaxies. Our peaks, derived from carefully homogenized data using the CPROPS algorithm following Rosolowsky et al. 2021, correspond to massive giant molecular clouds or giant molecular associations (GMCs or GMAs), so that our measurements provide a general quantitative description of the spatial distribution of massive star-forming complexes in nearby galaxies. Across our whole data set, peaks have median nearest neighbor distances of $305$~pc with a 16{-}84\% range of 158{-}505~pc, i.e., most peaks have an adjacent peak within 1{-}3 beams. This separation is also of the same order as the Jeans and Toomre lengths for these galaxies, consistent with the peak spacing reflecting the scale of instabilities in the overall gas disk. Using the Landy \& Szalay (1993) estimator, we calculate the two point autocorrelation function for CO peaks and find that CO peaks cluster relative to the null hypothesis of a smooth exponential disk. This agrees with the visual impression of highly structured CO emission in the PHANGS--ALMA maps. The peak of the clustering amplitude lies near the median cloud-cloud distance. Cloud spacing anti-correlates with the local low resolution CO surface brightness, and cloud space density correlates with the same. Clouds in early type galaxies show shorter inter-peak spacings, and clouds in low mass, late type galaxies show longer inter-peak spacings and more signs of stochasiticty compared to massive star-forming galaxies, though we highlight completeness as an issue in these cases.
