Collaborative Research: Mapping the Galactic Arecibo Sky in the 21-cm Line

合作研究：绘制 21 厘米线内的银河阿雷西博天空图

• 批准号: 0917810
• 负责人: Mary Putman
• 金额: --
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-11-20 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0917810&HistoricalAwards=false
• 关键词: Collaborative; Research; Mapping; Galactic; Arecibo

In this collaborative research project Drs. Snezana Stanimirovic (University of Wisconsin - Madison), Mary Putman (University of Michigan), and Eric Korpela (University of California - Berkeley) will survey the Galaxy in neutral hydrogen (HI) across the entire Arecibo Observatory sky (13,000 square degrees). This project will reveal the detailed spatial and kinematic structure of Galactic neutral hydrogen (HI) and allow new studies of the gaseous disk, halo, and the flow of material between them to be completed. Surveying the entire Arecibo sky has only recently become possible with the installment of the Arecibo L-band Feed Array (ALFA), a cluster of seven receivers operating at the wavelength of 21-cm that provide an unsurpassed combination of sensitivity, resolution, and mapping speed. Topics already being uncovered by the survey are: 1) the evolution between atomic and molecular clouds, 2) the interplay between the Galactic disk and halo, and 3) the detailed gas dynamics at work in the Galactic halo. In the Galactic disk, the high-resolution Arecibo observations, when compared with other interstellar tracers, probe the nature of the molecular gas not traced by carbon monoxide, the so called "dark gas". In addition, statistical investigation of HI datasets will relate properties of interstellar turbulence with the underlying physical conditions. The transition region between the Galactic disk and halo, when viewed by Arecibo, consists of a thick "belt" of numerous cold, discrete HI clouds. The survey will map the extent of this belt and investigate its possible connection to the local sites of star formation in the Galactic disk and galactic fountain models. In the Galactic halo itself, research will focus on the interaction between HI halo clouds known as high-velocity clouds (HVCs) and the surrounding diffuse halo gas. This will be done by studying the detailed features of the clouds in the context of models of the halo and comparing the cloud dynamics directly to simulations. The initial survey data also show that Arecibo will superbly sample the unexplored tail-end of the HVC population. At the heart of this project are synergistic studies of Galactic HI with surveys at other wavelengths and the latest numerical simulations of the interstellar medium and gaseous halo. This Galactic HI survey, confronted with theory and numerical simulations, promises fundamental contributions to our understanding of the cycling of matter in the Galaxy on scales from a few pc to many kpc.The data products from this survey will have a true legacy character, as the observations, data reduction, and final collating of the data cubes have been successfully developed, and these final data products will be made available to the public on a timely basis. The dissemination of these data products, will enhance the infrastructure for Galactic research across the world. This research will provide topics for Ph.D. theses and undergraduate research projects at the University of California-Berkeley, the University of Michigan, and the University of Wisconsin-Madison, fostering the confluence of research and education. Images of the Galactic HI sky will be displayed at outreach centers at the three institutions to demonstrate the multi-wavelength character of the Galaxy to the public.

在这个合作研究项目中。 Snezana Stanimirovic（威斯康星大学 - 麦迪逊分校），玛丽·普特曼（Mary Putman）（密歇根大学）和埃里克·科佩拉（Eric Korpela）（加利福尼亚大学 - 伯克利分校）将在整个Arecibo observoration Sky（13,000平方英尺）中调查中性氢（HI）的星系。 该项目将揭示银河中性氢（HI）的详细空间和运动学结构，并允许对气态磁盘，光环以及它们之间的材料流动进行新的研究。随着Arecibo L波段饲料阵列（ALFA）的分期，对整个Arecibo天空进行测量，这是一个以21 cm波长运行的七个接收器的集群，提供了敏感性，分辨率，分辨率和映射速度的无与伦比的组合。 调查已经发现的主题是：1）原子云和分子云之间的演变，2）银河磁盘和光晕之间的相互作用，以及3）银河系中工作中详细的气体动力学。 在银河磁盘中，与其他星际示踪剂相比，高分辨率Arecibo观测值探测了未被一氧化碳追踪的分子气的性质，即所谓的“深色气体”。此外，对HI数据集的统计研究将将星际湍流的特性与潜在的物理条件联系起来。当Arecibo查看时，银河磁盘和光晕之间的过渡区域由许多冷，离散的HI云的厚“皮带”组成。该调查将绘制该皮带的范围，并研究其可能与银河磁盘和银河喷泉模型中恒星形成的本地位点的联系。在银河光环本身中，研究将重点放在HI光环云之间的相互作用，称为高速云（HVC）和周围的弥漫性光晕气。这将通过在光环的模型的上下文中研究云的详细特征，并将云动力直接与模拟进行比较。最初的调查数据还表明，Arecibo将出色地品尝HVC种群未开发的尾端。 该项目的核心是对银河系HI的协同研究，并在其他波长处进行了调查以及星际介质和气态光环的最新数值模拟。面临理论和数值模拟面临的这项银河HI调查有望对我们对从几台PC到许多KPC的量表中的物质循环的理解做出基本贡献。该调查中的数据产品将具有真正的遗产性格，因为遵守，数据降低，数据群的最终数据是成功的，并且最终将成为这些产品的最终数据，并将其最终汇总到这些产品中，并将一定的数据概括为一定的数据。 这些数据产品的传播将增强全球银河研究的基础设施。这项研究将为博士提供主题。加利福尼亚大学 - 伯克利分校，密歇根大学和威斯康星大学麦迪逊分校的论文和本科研究项目，促进了研究和教育的融合。银河系天空的图像将在三个机构的外展中心展示，以向公众展示银河系的多波长特征。