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

螺旋星系的厘米波无线电光谱学回到大碟。海恩斯正在使用升级后的阿雷西博天线和绿色班克望远镜，利用射电光谱厘米范围内的强发射线，研究螺旋星系在一定红移范围内的特性。 主要研究了四个方面的问题：（1）利用21厘米谱线结合光学成像重建局域宇宙的密度场。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。以及关系本身弯曲的可能性。 另外，正在研究的是使用15度和+35度之间的十度带内的扩展样本来研究速度场的统计特性。(2)比较从合成映射观测导出的HI层的运动学。 从HI合成图获得的模型进行了比较，嵌入在暗物质的潜力盘星系的流体动力学数值模型。（三） 使用塔利-费舍尔技术来确定星系的质光比作为红移函数的演化可能性。 这包括对红移在0.08和0.33之间的星系使用21厘米线。(4)在高红移进行星系际HI和IH脉泽发射的试验性搜索。

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.