Title: Active Massive Black Holes in Dwarf Galaxies

Speaker: 郑致远

Institute: 南京大学

Host: 高玉龙

Time: 2026.1.16 周五 14:00 - 15:30

Location: 睿智楼三楼会议室

Abstract: While active galactic nucleus (AGN) feedback is a well-established driver of evolution in massive galaxies, its effect on the dwarf galaxies ( < 10^9.5 solar mass) remains debated. Using the high quality data from VLT/MUSE, we identified and investigated an AGN-driven, kpc-scale ionized gas outflow in a dwarf galaxy hosting a 10^5.4 solar mass black hole, providing direct evidence that AGN feedback can effectively couple with the interstellar medium in a low-mass halo. To further explore the origin of supermassive black holes (SMBHs), i.e., black hole seeds. Due to inefficient dynamical friction, the relics of these seeds may persist in local dwarf galaxies. To identify these relics, i.e. massive or intermediate massive black holes, in dwarf galaxies, recently, we conducted the Dwarf Galaxy Integral-field Survey (DGIS), observing with VLT/MUSE and ANU2.3m/WiFeS. Benefiting from well spatially resolved IFS data, we identified a unique system, UGCA 193, which hosts two wandering MBHs confirmed via optical strong line ratios. Moreover, to break the degeneracy between star formation and AGN in low metallicity environments, we constructed an HII-region catalog from the DGIS sample and investigated its distribution in BPT space. Our results highlight the significance of dwarf galaxies as a unique laboratory for understanding the origin, growth, and feedback mechanisms of SMBHs. 

Bio: 郑致远，南京大学天文与空间科学学院博士研究生，受CSC国家留学基金委资助前往智利欧洲南方天文台ESO留学1年，研究方向为矮星系、黑洞增长及其反馈等，为施勇教授矮星系IFU巡天（DGIS）项目核心成员，拥有丰富的光学望远镜观测和数据分析经验。作为第一作者，在A&A、MNRAS等期刊上发表3篇论文。