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SUMMARY:To be or not to be: Are JWST-discovered AGN real black holes? - Dr
 . Xihan Ji\, Kavli Institute for Cosmology\, Cambridge
DTSTART:20241029T111500Z
DTEND:20241029T120000Z
UID:TALK223798@talks.cam.ac.uk
CONTACT:Charles Walker
DESCRIPTION:Recent JWST observations have revealed a large population of l
 ow-luminosity broad-line AGN in the early Universe\, showing a clear broad
 -line component in their H-alpha and/or H-beta emission. However\, these A
 GN exhibit peculiar properties clearly different from the local AGN as wel
 l as high-luminosity QSOs at high redshift. The low-luminosity AGN uncover
 ed by JWST are weak in the hard X-ray\, frequently show significant nuclea
 r dust obscuration\, and sometimes show narrow absorption in permitted tra
 nsitions. More recently\, based on the non-variability of several JWST-ide
 ntified AGN through multi-epoch photometry\, it was suspected that a consi
 derable number of JWST-identified AGN are not accreting black holes\, but 
 are star-formation (SF) driven processes in disguise. In this talk\, I wil
 l briefly review some recent ideas on the explanations for the peculiariti
 es of JWST-identified broad-line AGN\, including galactic outflows\, inela
 stic Raman scattering\, obscuration by broad-line regions\, or an alternat
 ive accretion disk model. In general\, we find that current non-AGN explan
 ations require exotic physical conditions unlikely to be found in the gene
 ral population of JWST-identified broad-line sources. The AGN explanations
 \, on the other hand\, require future investigations based on deep and mul
 ti-band follow-up to verify.
LOCATION:Coffee area\, Battcock Centre
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