Radio and Infrared Studies of Star Formation in Galaxies

星系中恒星形成的无线电和红外研究

• 批准号: 0071276
• 负责人: J. Turner
• 金额: $ 24.93万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2005-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0071276&HistoricalAwards=false
• 关键词: Radio; Infrared; Studies; Star; Formation

ABSTRACTAST- 0071276TurnerThe goal of this project is to obtain IR Brackett-line spectroscopy, 10-micron and 20-micron observations using the Keck telescope, and VLA synthesis images at 1 and 2cm for between 6 and 12 nearby galaxies which have bright radio continuum emission at 1 cm. These will be used to study the emission from star-forming regions in these objects. The data will provide a substantive base for the interpretation of future ground-based (the Atacama Large Millimeter Array and inferred observations from the South Pole) and deep, space-based (SOFIA/SIRTF ) surveys where the 10 micron region will be redshifted to100 microns.A dramatic mode of star formation is the starburst, in which star formation appears to proceed via large clusters rather than the sparse open clusters that currently form in the Milky Way. These "super star clusters" are likely precursors to globular clusters. Globular clusters in the Milky are all old, and there are indications that the early universe may have preferred to form these large clusters. The formation of super star clusters can be studied by observing the very youngest large star-forming regions, which are closest to their birth conditions. These regions are usually visually obscured by dust and gas clouds. The goal of this project is the detection of star formation in nearby galaxies in the infrared and radio wavelengths where star clusters and nebulae are not as affected by extinction as they are in the visible. Free-free radio continuum observations with the Very Large Array radio telescope will be used to map out radio nebulae surrounding young stars. Hidden nebulae can also be revealed by the mid-infrared emission from dust warmed by intense starlight from these clusters. With the Keck Telescope, nearby starbursts will be imaged in the mid-infrared at resolutions sufficient to distinguish gaseous nebulae from young star clusters. The first step is to locate the youngest super star clusters in nearby galaxies, where they are relatively easy to study. This is the major goal of this research. Eventually, once the locations of these clusters and their nebulae have been established, the imaging of gas clouds near the nebulae will show the relation of the clusters to their natal gas, which may reveal the trigger for the star formation. This is a topic that can be fruitfully explored with the future Atacama Large Millimeter Array telescope. Funding for this project was provided by the NSF program for Extragalactic Astronomy & Cosmology (AST/EXC).***

特纳本项目的目标是获得红外布拉克特线光谱，10微米和20微米的观测使用凯克望远镜，和VLA合成图像在1和2厘米之间的6和12个附近的星系，有明亮的无线电连续辐射在1厘米。这些将用于研究这些物体中恒星形成区域的发射。这些数据将为解释未来的地基（阿塔卡马大型毫米波阵列和南极推断观测）和深空基（SOFIA/SIRTF）的测量，其中10微米的区域将被红移到100微米。一个戏剧性的星星形成模式是星暴，其中，星星的形成似乎是通过大型星系团而不是目前在银河系中形成的稀疏疏散星系团进行的。这些"超级星星团"很可能是球状星团的前身。银河系中的球状星团都很古老，有迹象表明，早期宇宙可能倾向于形成这些大型星团。超级星星团的形成可以通过观察最年轻的大型恒星形成区域来研究，这些区域最接近它们的诞生条件。这些区域通常在视觉上被尘埃和气体云所掩盖。该项目的目标是在红外和无线电波段探测附近星系中星星的形成，在这些波段，星星团和星云不像在可见光区那样受到消光的影响。利用甚大阵列射电望远镜进行的自由-自由射电连续观测将用于绘制年轻恒星周围的射电星云图。隐藏的星云也可以通过这些星团强烈的星光加热的尘埃的中红外辐射来揭示。利用凯克望远镜，可以在中红外波段拍摄到附近的星爆，其分辨率足以区分气体星云和年轻的星星团。第一步是在附近的星系中定位最年轻的超级星星团，在那里它们相对容易研究。这是本研究的主要目标。最终，一旦这些星团及其星云的位置被确定，星云附近的气体云的成像将显示星团与其诞生气体的关系，这可能揭示星星形成的触发因素。这是一个可以用未来的阿塔卡马大型毫米波阵列望远镜进行富有成效的探索的课题。该项目的资金由美国国家科学基金会的河外天文宇宙学计划（AST/EXC）提供。&