天文学系
站内检索
High Energy Neutrino Astronomy
THE QUEST FOR DUSTY STARFORMING GALAXIES
Calibrating Ia Supernova Absolute Luminosities using the Distance-Duality Relation
Hunting for Cosmic Baryons
WISE-selected, hyperluminous dust-obscured galaxies: IR SED decomposition and host galaxy morphology
爱因斯坦探针:时域天文发现的机遇
Loop quantum cosmology and alternatives to inflation
A Golden Age for Astrometry - Uncovering the Secrets of the Milky Way
Recent Work on Galactic Dynamics
Superconducting Detectors for Millimeter/Submillimeter Astronomy
More系所链接
    您现在的位置:首页>学术活动>学术报告

    Hunting for Cosmic Baryons

     

    报告人:Prof. Wei Cui (Purdue University)

     

    时间:2016年5月3日下午4:00

    地点:东区理化大楼18层天文台报告厅

     

    报告摘要: One of the triumphs of the Big Bang Nucleosynthesis (BBN) theory is that its predicted abundances of primordial isotopes agree with the measured values. Moreover, the predicted baryonic mass is accounted for at high redshifts observationally. Going towards low redshifts, however, only a fraction of the BBN baryons are detected; this is the “missing baryon” problem. The common wisdom is that those baryons are not missing, but are hidden in some warm-hot gas of very low density, which is difficult to detect; cosmological simulations support this view. Such gas may be “seen” through the emission or absorption lines of its highly ionized constituents. For that, an X-ray spectrometer of high throughput and high resolution would be required. I will describe the development of microcalorimeters for X-ray spectroscopy. I will also briefly discuss the design of a satellite experiment that employs the microcalorimeters to carry out a survey of warm-hot gas in the universe, addressing a wide range of important issues in astrophysics, including the “missing baryon” problem.


     
    欲浏览最佳效果 建议使用IE6.0版本以上的浏览器 1024x768以上分辨率
    版权所有:中国科学技术大学物理学院天文学系