《星系內的中性氫在過去四十億年的演化》研討會


Research Seminar:- The evolution of neutral atomic hydrogen in galaxies over the past four billion years

Neutral atomic hydrogen(HI) acts as the primary fuel reservoir for the star-formation process in galaxies. The HI mass function describes the distribution of the atomic hydrogen content of galaxies at a given epoch, and its evolution provides an important probe of models of galaxy formation and evolution. Unfortunately, the weakness of the HI 21cm line, the only probe of the HI mass of galaxies, has restricted our knowledge of the HI mass function to the nearby Universe. The evolution of the HI mass function with redshift has remained unclear due to the lack of observational constraints on the HI mass function at earlier epochs. In this talk the speaker will discuss an indirect method of measuring the HI mass function using the measurements of HI scaling relations and luminosity functions. This method has led to the first measurement of the HI mass function beyond the local universe, at redshift z ~ 0.35, using data from a deep upgraded Giant Metrewave Radio Telescope HI 21 cm survey. He will also discuss how these measurements help us understand the evolution of the HI mass function and the neutral gas reservoir of galaxies over the past four billion years.

時間:2023.04.12(三) 14:30
地點:香港大學 明華綜合大樓 MW103
講者:Dr. Apurba BERA (International Centre for Radio Astronomy Research, Curtin University, Perth, Australia)
語言:英語

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【此屬轉載訊息,以主事單位發佈為準】

此活動由香港大學物理系主辦。

https://www.physics.hku.hk/event/coming/20230412-ab

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