三維觀測星系中分子氣體 – 從廣域動力學到超大質量黑洞


Seminar:- 3D Observations of Molecular Gas in Galaxies - From Global Dynamics to Supermassive Black Holes

The speaker will first briefly review the molecular gas content of early-type galaxies. He will show not only that they unexpectedly harbour much cold gas, but also that it is the best tracer of the circular velocity, thus allowing accurate spatially-resolved dynamical mass measurements in galaxies across the Hubble sequence. Second, the speaker will explore the use of molecular gas for studies of the Tully-Fisher (luminosity-rotational velocity) relation of galaxies to high redshifts. He will highlight the work done to establish local (z=0) benchmarks and will discuss the challenges posed by systematic effects when comparing nearby and distant galaxies. Third, he will demonstrate that CO can be used to easily and accurately measure the mass of the supermassive black holes lurking at galaxy centres. He will discuss substantial ongoing efforts to do this and present many spectacular new ALMA measurements, that open the way to literally hundreds of measurements across the Hubble sequence with a unique method. The speaker will also hint at how the same data allow to study the spatially-resolved properties of giant molecular cloud populations in non-local galaxies for the first time, providing a new tool to understand and contrast the star formation efficiency of galaxies on cloud scale. 
 
時間:2017.05.24(三) 14:30
地點:香港大學 莊月明物理樓522室
講者:Prof. Martin Bureau (University of Oxford)
語言:英語

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此活動由香港大學物理系主辦。

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