论文标题

附近星形星系中的气星形成周期II。 49个phangs星系的CO和H $α$排放的分布

The Gas-Star Formation Cycle in Nearby Star-forming Galaxies II. Resolved Distributions of CO and H$α$ Emission for 49 PHANGS Galaxies

论文作者

Pan, Hsi-An, Schinnerer, Eva, Hughes, Annie, Leroy, Adam, Groves, Brent, Barnes, Ashley Thomas, Belfiore, Francesco, Bigiel, Frank, Blanc, Guillermo A., Cao, Yixian, Chevance, Melanie, Congiu, Enrico, Dale, Daniel A., Eibensteiner, Cosima, Emsellem, Eric, Faesi, Christopher M., Glover, Simon C. O., Grasha, Kathryn, Herrera, Cinthya N., Ho, I-Ting, Klessen, Ralf S., Kruijssen, J. M. Diederik, Lang, Philipp, Liu, Daizhong, McElroy, Rebecca, Meidt, Sharon E., Murphy, Eric J., Pety, Jerome, Querejeta, Miguel, Razza, Alessandro, Rosolowsky, Erik, Saito, Toshiki, Santoro, Francesco, Schruba, Andreas, Sun, Jiayi, Tomicic, Neven, Usero, Antonio, Utomo, Dyas, Williams, Thomas G.

论文摘要

星系中分子气体和恒星形成的相对分布可深入了解气体和恒星之间周期的物理过程和时间尺度。在这项工作中,我们在每个星系目标中跟踪CO和H $α$发射的相对空间配置,并使用这些测量值来量化星形形成不同进化阶段区域的分布:从没有恒星形成的分子气体中,而无需H $α$从H $α$带到星星形成的气体以及到HII和HII区域。大型样品是从附近星系Alma和窄带H $α$(phangs-alma和phangs-h $α$)的窄带分辨率下的物理学中得出的,它跨越了广泛的恒星质量和形态学类型,使我们能够研究全球星系物质的盖star形成周期的依赖性。在150 pc的分辨率下,不同阶段区域的发生率显示出对径向探测的径向范围内的恒星质量和哈勃类型星系的依赖性。大型和/或较早的型星系表现出重要的分子气体储层,而无需h $α$追踪的恒星形成,而低质量星系具有大量的HII区域,这些区域可能已经分散了其出生云或由低质量形成,更孤立的云。银河结构为CO和H $α$发射的相对分布增加了复杂性。仅当观察到的空间尺度为$ \ ll $ 500 PC时,CO和H $α$追踪的星系特性与分布之间的趋势才能看到,这反映了区分恒星形成过程的阶段的关键分辨率要求。

The relative distribution of molecular gas and star formation in galaxies gives insight into the physical processes and timescales of the cycle between gas and stars. In this work, we track the relative spatial configuration of CO and H$α$ emission at high resolution in each of our galaxy targets, and use these measurements to quantify the distributions of regions in different evolutionary stages of star formation: from molecular gas without star formation traced by H$α$ to star-forming gas, and to HII regions. The large sample, drawn from the Physics at High Angular resolution in Nearby GalaxieS ALMA and narrowband H$α$ (PHANGS-ALMA and PHANGS-H$α$) surveys, spans a wide range of stellar mass and morphological types, allowing us to investigate the dependencies of the gas-star formation cycle on global galaxy properties. At a resolution of 150 pc, the incidence of regions in different stages shows a dependence on stellar mass and Hubble type of galaxies over the radial range probed. Massive and/or earlier-type galaxies exhibit a significant reservoir of molecular gas without star formation traced by H$α$, while lower-mass galaxies harbor substantial HII regions that may have dispersed their birth clouds or formed from low-mass, more isolated clouds. Galactic structures add a further layer of complexity to relative distribution of CO and H$α$ emission. Trends between galaxy properties and distributions of gas traced by CO and H$α$ are visible only when the observed spatial scale is $\ll$ 500 pc, reflecting the critical resolution requirement to distinguish stages of star formation process.

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