A CO isotopologue Line Atlas within the Whirlpool galaxy Survey (CLAWS)
學年 110
學期 2
出版（發表）日期 2022-06-23
作品名稱 A CO isotopologue Line Atlas within the Whirlpool galaxy Survey (CLAWS)
作品名稱（其他語言）
著者 Jakob S. den Brok; Frank Bigiel; Kazimierz Sliwa; Toshiki Saito; Antonio Usero; Eva Schinnerer; Adam K. Leroy; María J. Jiménez-Donaire; Erik Rosolowsky; Ashley T. Barnes; Johannes Puschnig; Jérôme Pety; Andreas Schruba; Ivana Bešlić; Yixian Cao; Cosima Eibensteiner; Simon C. O. Glover; Ralf S. Klessen; J. M. Diederik Kruijssen; Sharon E. Meidt; Lukas Neumann; Neven Tomičić; Hsi-An Pan; Miguel Querejeta; Elizabeth Watkins; Thomas G. Williams; and David Wilner
單位
出版者
著錄名稱、卷期、頁數 Astronomy & Astrophysics 662, p.29
摘要 We present the CO isotopologue Line Atlas within the Whirpool galaxy Survey (CLAWS), which is based on an IRAM 30 m large programme that provides a benchmark study of numerous faint CO isotopologues in the millimetre-wavelength regime across the full disc of the nearby grand-design spiral galaxy M 51 (NGC 5194). The survey’s core goal is to use the low-J CO isotopologue lines to constrain CO excitation and chemistry, and therefrom the local physical conditions of the gas. In this survey paper, we describe the CLAWS observing and data reduction strategies. We map the J = 1 → 0 and 2 → 1 transitions of the CO isotopologues 12CO, 13CO, C18O, and C17O, as well as several supplementary lines within the 1 mm and 3 mm window (CN(1-0), CS (2-1), CH3OH(2-1), N2H+ (1–0), and HC3N (10–9)) at ~1 kpc resolution. A total observation time of 149 h offers unprecedented sensitivity. We use these data to explore several CO isotopologue line ratios in detail, study their radial (and azimuthal) trends, and investigate whether changes in line ratios stem from changes in interstellar medium properties such as gas temperatures, densities, or chemical abundances. For example, we find negative radial trends for the 13CO/12CO, C18O/12CO, and C18O/13CO line ratios in their J = 1 → 0 transitions. We also find variations with the local environment, such as higher 12CO (2–1)/(1–0) or 13CO/12CO (1-0) line ratios in interarm regions compared to spiral arm regions. We propose that these aforementioned variations in CO line ratios are most likely due to a variation in the optical depth, though abundance variations due to selective nucleosynthesis on a galaxy-wide scale could also play a role. We also study the CO spectral line energy distribution (SLED) using archival JCMT 12CO (3–2) data and find a variation in the SLED shape with local environmental parameters, suggesting changes in the optical depth, gas temperatures, or densities.
關鍵字 galaxies: ISM;ISM: molecules;radio lines: galaxies
語言 en_US
ISSN 2329-1273;2329-1265
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
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/123342 )