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SUMMARY:Candidate sub-kpc dual SMBHs revealed with variability-induced jit
 ters of quasars
DTSTART;VALUE=DATE-TIME:20230629T154500Z
DTEND;VALUE=DATE-TIME:20230629T160000Z
DTSTAMP;VALUE=DATE-TIME:20260909T195707Z
UID:indico-contribution-821@cern.ch
DESCRIPTION:Speakers: Haochen Wang (University of Science and Technology o
 f China)\nDual super massive black holes at sub-kpc to kpc scales are the 
 products of galaxy mergers and the progenitors of eventually coalescing bi
 nary SMBHs. Dual AGNs or off-nucleus AGNs may be witnessed if both or one 
 of the dual SMBHs are accreting. Despite its rarity\, such systems are ess
 ential for learning the dynamical evolution of binary SMBHs as well as the
  process of galaxy merging. Recently a novel and highly efficient astromet
 ry-based method named varstrometry has been put forward to search for dual
  SMBHs at high redshift. This method shows that the unsynchronized flux va
 riability of off-nucleus and dual AGNs will cause astrometric jitter detec
 table by Gaia without spatially resolving them. Based on varstrometry we s
 elect a rare sample of 5 high redshift radio quasars with clear Gaia astro
 metric jitters\, and with e-MERLIN observations a single compact radio sou
 rce is revealed for each of them. Clear Gaia-radio offsets of $\\sim$ 9 --
  60 mas are deteced in all but one targets. The observed Gaia jitters appe
 ar consistent with the expected values. These detected Gaia-radio offsets 
 suggest these candidate dual SMBHs may have projected separations as small
  as $\\sim$ 0.01 - $0.1''$ ($\\sim$ 0.1 kpc\, depending on the optical flu
 x ratio of two SMBHs).\n\nhttps://indico.unina.it/event/61/contributions/8
 21/
LOCATION:Centro Congressi Federico II Aula Magna
URL:https://indico.unina.it/event/61/contributions/821/
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