Centimeter Wave Radio Spectroscopy of Spiral Galaxies: Back to the Big Dishes

螺旋星系的厘米波射电光谱：回到大碟子

• 批准号: 9900695
• 负责人: Martha Haynes
• 金额: $ 37.64万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900695&HistoricalAwards=false
• 关键词: Centimeter; Wave; Radio; Spectroscopy; Spiral

Martha P. HaynesCentimeter wave radio spectroscopy of spiral galaxies back to the big dishesDr. Haynes is using upgraded Arecibo antenna and the Green Bank Telescope to investigate the properties of spiral galaxies over a range of redshifts using the strong emission line in the centimeter range of the radio spectrum. Four main topics are under study: (1) using the 21 cm line in combination with optical imaging to reconstruct the density field in the local universe. Dr. Haynes is studying the systematics of the Tully-Fisher relation, particularly the effects of surface brightness, luminosity and morphology. And the possibility of curvature in the relation itself. Also under investigation is a study of the statistical properties of the velocity field using an expanded sample within the declination band between 15 and +35 degrees.(2) comparing the kinematics of the HI layer derived from synthesis mapping observations. Models obtained from HI synthesis maps are compared with hydrodynamic numerical models of disk galaxies embedded in dark matter potentials.(3) using the Tully-Fisher technique to determine the possibility of evolution of the mass-to-light ratio of galaxies as a function of redshift. This includes the use of the 21 cm line for galaxies with redshifts between 0.08 and 0.33.(4) conducting pilot searches for intergalactic HI and IH maser emission at high redshift.

玛莎·p·海恩斯螺旋星系的毫米波射电光谱学回到大碟子上。海恩斯正在使用升级后的阿雷西博天线和绿岸望远镜，利用无线电频谱厘米范围内的强发射线，在一系列红移范围内研究螺旋星系的特性。主要研究方向有四个：(1)利用21 cm线结合光学成像重建局部宇宙的密度场。海恩斯博士正在研究塔利-费舍尔关系的系统学，特别是表面亮度、光度和形态的影响。以及关系本身存在曲率的可能性。另外一项正在研究的是速度场的统计特性，该特性使用的是在15到+35度之间的赤纬带内的扩展样本。(2)比较综合成图观测所得HI层的运动学。从HI综合图中获得的模型与嵌入暗物质势的盘状星系的流体动力学数值模型进行了比较。(3)利用Tully-Fisher技术确定星系的质光比随红移变化的可能性。这包括对红移在0.08到0.33之间的星系使用21厘米线。(4)对星系间高红移高微波激射进行先导搜索。