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Title: Little Red X: A super-Eddington accreting black hole at z~4
Speaker: Dr. Hyewon Suh (NoirLab, US)
Date&Time: 2024-10-25, 02:00 PM
Location: Science Hall 638
Talk to be delivered in English
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Abstract: Recent JWST observations have uncovered a surprisingly abundant population of faint, red objects — referred to as little red dots — at z~4-7. Together with the presence of supermassive black holes at z>6, this raises questions about the formation and growth histories of early black holes. Current theories proposes two primary pathways for the formation of seed black holes: the death of the first stars (i.e., light seeds) and the direct collapse of primordial gas clouds (i.e., heavy seeds), yet observational confirmation remains elusive.
In this presentation, I will discuss the recent discovery of LID-568, a low-mass black hole in an extreme phase of rapid growth at z~4. This object is similar to other faint AGNs identified by JWST but stands out due to its bright X-ray emissions and an accretion rate exceeding 40 times the Eddington limit. Detailed analysis of JWST NIRSpec/IFU observations reveals spatially extended Ha emission, indicative of nuclear-driven outflows. I will explore the implications of these findings for our understanding of origin of seed black holes and their early growth.