arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05023astro-ph.GA
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CMZoom:调查概述和首次数据发布

CMZoom: Survey Overview and First Data Release

Cara Battersby, Eric Keto, Daniel Walker, Ashley Barnes, Daniel Callanan, Adam Ginsburg, H Perry Hatchfield, Jonathan Henshaw, Jens Kauffmann, J. M. Diederik Kr… 展开作者

Cara Battersby, Eric Keto, Daniel Walker, Ashley Barnes, Daniel Callanan, Adam Ginsburg, H Perry Hatchfield, Jonathan Henshaw, Jens Kauffmann, J. M. Diederik Kruijssen, Steven N. Longmore, Xing Lu, Elisabeth A. C. Mills, Thushara Pillai, Qizhou Zhang, John Bally, Natalie Butterfield, Yanett A. Contreras, Luis C. Ho, Jurgen Ott, Nimesh Patel, Volker Tolls

摘要:

我们概述了CMZoom调查及其首次数据发布。CMZoom是第一个对中央分子区(CMZ;银河系内部500 pc)进行盲测的高分辨率调查,其波长对高质量恒星的前光标敏感。CMZoom是一个在亚毫米波阵列(SMA)上运行的500小时的大型项目,它以约3”(0.1 pc)的分辨率,在10^23 cm^-2的分子氢柱密度之上,以1.3 mm的分辨率绘制了CMZ中所有的气体和尘埃。在本文中,我们专注于1.3毫米尘埃连续体及其数据发布,但也描述了CMZoom谱线数据,将在即将出版的出版物中发布。虽然CMZoom检测到许多具有丰富和复杂子结构的区域,但其关键结果是在0.1 - 2 pc尺度上(致密致密气体部分:CDGF)的致密子结构中存在整体缺陷。与银盘中的云相比,CMZ中的CDGF要低得多,尽管平均柱密度要高得多。具有高CDGF的CMZ云是众所周知的活跃恒星形成地点。CMZ中的大多数气体无法形成致密的子结构,这可能是CMZ中缺乏恒星形成的原因,考虑到它的高密度,这令人惊讶。导致低CDGF的因素还不清楚,但可能是由于CMZ的极端环境,对我们理解整个宇宙的恒星形成过程具有深远的影响。

英文摘要:

We present an overview of the CMZoom survey and its first data release. CMZoom is the first blind, high-resolution survey of the Central Molecular Zone (CMZ; the inner 500 pc of the Milky Way) at wavelengths sensitive to the pre-cursors of high-mass stars. CMZoom is a 500-hour Large Program on the Submillimeter Array (SMA) that mapped at 1.3 mm all of the gas and dust in the CMZ above a molecular hydrogen column density of 10^23 cm^-2 at a resolution of ~3" (0.1 pc). In this paper, we focus on the 1.3 mm dust continuum and its data release, but also describe CMZoom spectral line data which will be released in a forthcoming publication. While CMZoom detected many regions with rich and complex substructure, its key result is an overall deficit in compact substructures on 0.1 - 2 pc scales (the compact dense gas fraction: CDGF). In comparison with clouds in the Galactic disk, the CDGF in the CMZ is substantially lower, despite having much higher average column densities. CMZ clouds with high CDGFs are well-known sites of active star formation. The inability of most gas in the CMZ to form compact substructures is likely responsible for the dearth of star formation in the CMZ, surprising considering its high density. The factors responsible for the low CDGF are not yet understood but are plausibly due to the extreme environment of the CMZ, having far-reaching ramifications for our understanding of the star formation process across the cosmos.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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