The Organization of Cloud-scale Gas Density Structure: High-resolution CO versus 3.6 μm Brightness Contrasts in Nearby Galaxies
學年 109
學期 2
出版（發表）日期 2021-06-01
作品名稱 The Organization of Cloud-scale Gas Density Structure: High-resolution CO versus 3.6 μm Brightness Contrasts in Nearby Galaxies
作品名稱（其他語言）
著者 Sharon E. Meidt; Adam K. Leroy; Miguel Querejeta; Eva Schinnerer; Jiayi Sun; Arjen van der Wel; Eric Emsellem; Jonathan Henshaw; Annie Hughes; J. M. Diederik Kruijssen; Erik Rosolowsky; Andreas Schruba; Ashley Barnes; Frank Bigiel; Guillermo A. Blanc; Melanie Chevance; Yixian Cao; Daniel A. Dale; Christopher Faesi; Simon C. O. Glover; Kathryn Grasha; Brent Groves; Cynthia Herrera; Ralf S. Klessen; Kathryn Kreckel; Daizhong Liu; Hsi-An Pan; Jerome Pety; Toshiki Saito; Antonio Usero; Elizabeth Watkins; Thomas G. Williams
單位
出版者
著錄名稱、卷期、頁數 The Astrophysical Journal 913(2), 113 (16 pages)
摘要 In this paper we examine the factors that shape the distribution of molecular gas surface densities on the 150 pc scale across 67 morphologically diverse star-forming galaxies in the PHANGS-ALMA CO (2–1) survey. Dividing each galaxy into radial bins, we measure molecular gas surface density contrasts, defined here as the ratio between a fixed high percentile of the CO distribution and a fixed reference level in each bin. This reference level captures the level of the faint CO floor that extends between bright filamentary features, while the intensity level of the higher percentile probes the structures visually associated with bright, dense interstellar medium features like spiral arms, bars, and filaments. We compare these contrasts to matched percentile-based measurements of the 3.6 μm emission measured using Spitzer/IRAC imaging, which trace the underlying stellar mass density. We find that the logarithms of CO contrasts on 150 pc scales are 3–4 times larger than, and positively correlated with, the logarithms of 3.6 μm contrasts probing smooth nonaxisymmetric stellar bar and spiral structures. The correlation appears steeper than linear, consistent with the compression of gas as it flows supersonically in response to large-scale stellar structures, even in the presence of weak or flocculent spiral arms. Stellar dynamical features appear to play an important role in setting the cloud-scale gas density in our galaxies, with gas self-gravity perhaps playing a weaker role in setting the 150 pc scale distribution of gas densities.
關鍵字
語言 en_US
ISSN 0004-637X
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/122454 )