Spring 2024 Physics Colloquium:- Does galaxy interaction affect the black hole growth in the galaxy center? Insights from statistical and case studies
The interaction of galaxies is known to regulate the star-formation activities in the merging systems, or galaxy pairs, however, whether and how such interactions affect the central supermassive black hole (aka. Active Galactic Nuclei(AGN) activity) is still under debate. Controversies exist as to whether AGN activities are enhanced or suppressed during the different merging phases. In addition, during the merging process, whether AGNs boost or suppress the star formation through the so-called `positive’ or `negative’ feedback is still an open question. The answer to this question involves understanding of the physical properties of galaxy pairs in various scales, from the supermassive black hole at the galactic center to ionized gas, molecular gas, atomic gas, and the dust contents throughout the galaxies and towards their close vicinities. Based on statistical samples of emission line selected galaxy pairs with Mapping Nearby Galaxies at Apache point observatory(MaNGA) and Hubble Space Telescope(HST), the speaker and her team study the AGN fraction evolution in various merger cases, and compare to isolated galaxies the global and resolved stellar mass, star formation rate, emission line, and AGN luminosity properties. Then through case studies of the HI environment of galaxy pairs with Five-hundred-meter Aperture Spherical Telescope(FAST), they further demonstrate the power to combine observations of significantly different scales and resolutions, and their insights on the role of AGNs during galaxy interaction.
時間：2024.02.21(三) 17:00
地點：香港大學 莊月明物理樓* CYPP2, LG1/F
講者：Sophia DAI Yu 戴昱 (中國科學院 國家天文台**)
語言：英語
免費會議，歡迎參加
【此屬轉載訊息，以主事單位發佈為準】
*Chong Yuet Ming Physics Building
**National Astronomical Observatories of China
此活動由香港大學物理系主辦。
