The 2D metallicity distribution and mixing scales of nearby galaxies
學年 110
學期 1
出版（發表）日期 2022-01-01
作品名稱 The 2D metallicity distribution and mixing scales of nearby galaxies
作品名稱（其他語言）
著者 Thomas G Williams; Kathryn Kreckel; Francesco Belfiore; Brent Groves; Karin Sandstrom; Francesco Santoro; Guillermo A Blanc; Frank Bigiel; Médéric Boquien; Mélanie Chevance; Enrico Congiu; Eric Emsellem; Simon C O Glover; Kathryn Grasha; Ralf S Klessen; Eric Koch; J M Diederik Kruijssen; Adam K Leroy; Daizhong Liu; Sharon Meidt; Hsi-An Pan; Miguel Querejeta; Erik Rosolowsky; Toshiki Saito; Patricia Sánchez-Blázquez; Eva Schinnerer; Andreas Schruba; Elizabeth J Watkins
單位
出版者
著錄名稱、卷期、頁數 Monthly Notices of the Royal Astronomical Society 509(1), p.1303-1322
摘要 Understanding the spatial distribution of metals within galaxies allows us to study the processes of chemical enrichment and mixing in the interstellar medium. In this work, we map the 2D distribution of metals using a Gaussian Process Regression (GPR) for 19 star-forming galaxies observed with the Very Large Telescope/Multi Unit Spectroscopic Explorer (VLT–MUSE) as a part of the PHANGS–MUSE survey. We find that 12 of our 19 galaxies show significant 2D metallicity variation. Those without significant variations typically have fewer metallicity measurements, indicating this is due to the dearth of HII regions in these galaxies, rather than a lack of higher-order variation. After subtracting a linear radial gradient, we see no enrichment in the spiral arms versus the disc. We measure the 50 per cent correlation scale from the two-point correlation function of these radially subtracted maps, finding it to typically be an order of magnitude smaller than the fitted GPR kernel scale length. We study the dependence of the two-point correlation scale length with a number of global galaxy properties. We find no relationship between the 50 per cent correlation scale and the overall gas turbulence, in tension with existing theoretical models. We also find more actively star-forming galaxies, and earlier type galaxies have a larger 50 per cent correlation scale. The size and stellar mass surface density do not appear to correlate with the 50 per cent correlation scale, indicating that perhaps the evolutionary state of the galaxy and its current star formation activity is the strongest indicator of the homogeneity of the metal distribution.
關鍵字 ISM: abundances;ISM: evolution;galaxies: general;galaxies: ISM
語言 en_US
ISSN 1365-2966
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 GBR
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/987654321/122459 )