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SUMMARY:Darach Watson:  Litte red dots
DTSTART:20260908T111500Z
DTEND:20260908T121500Z
DTSTAMP:20260917T143100Z
UID:indico-event-9808@indico.fysik.su.se
CONTACT:alexander.burgman@fysik.su.se\;azadeh.fattahi@fysik.su.se
DESCRIPTION:Little red dots (LRDs) are a newly discovered population of ex
 tremely compact (r<35 pc)\, luminous JWST sources whose spectra combine fe
 atures associated with stellar atmospheres and accreting supermassive blac
 k holes (SMBHs). Yet they generally lack the X-ray\, radio\, and variabili
 ty signatures of classical active galactic nuclei. Proposed explanations r
 ange from massive binary stars and supernovae to supermassive stars\, dire
 ct-collapse or primordial black holes\, tidal disruption events\, and AGN 
 with suppressed coronae. I will present our work showing that nearly all o
 bserved LRD properties can be reproduced by a roughly million-solar-mass b
 lack hole accreting from within a dense gaseous cocoon. This raises the po
 ssibility that LRDs reveal the earliest\, deeply embedded phase of an SMBH
  accretion episode\, visible at these epochs because the low dust content 
 allows us to see through the cocoon.\nAbout the speaker: Darach Watson is
  a professor of astrophysics at the University of Copenhagen and head of t
 he ERC Synergy project HEAVYMETAL. His research focuses on the early Unive
 rse\, the formation of the first galaxies and supermassive black holes\, g
 amma-ray bursts and neutron-star mergers\, and the origin and evolution of
  cosmic dust. He has played a leading role in studies of the enigmatic Lit
 tle Red Dot population discovered by JWST.\n\nhttps://indico.fysik.su.se/e
 vent/9808/
LOCATION:FB51 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9808/
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