---
res:
  bibo_abstract:
  - Subparsec supermassive black hole (SMBH) binaries are expected to be common in
    active galactic nuclei as a result of the hierarchical buildup of galaxies via
    mergers. While direct evidence for these compact binaries is lacking, a few hundred
    candidates have been identified, most based on the apparent periodicities of their
    optical light curves. Since these signatures can be mimicked by active galactic
    nuclei red noise, additional evidence is needed to confirm their binary nature.
    Recurring self-lensing flares, occurring whenever the two BHs are aligned with
    the line of sight within their Einstein radii, have been suggested as additional
    binary signatures. Furthermore, in many cases, lensing flares are also predicted
    to contain a “dip,” whenever the lensed SMBH’s shadow is comparable in angular
    size to the binary’s Einstein radius. This feature would unambiguously confirm
    binaries and additionally identify SMBH shadows that are spatially unresolvable
    by high-resolution Very Long Baseline Interferometry (VLBI). Here we estimate
    the number of quasars for which these dips may be detectable by Legacy Survey
    of Space and Time (LSST) by extrapolating the quasar luminosity function to faint
    magnitudes and assuming that SMBH binaries are randomly oriented and have mass
    ratios following those in the Illustris simulations. Under plausible assumptions
    about quasar lifetimes, binary fractions, and Eddington ratios, we expect tens
    of thousands of detectable flares, of which several dozen contain measurable dips.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Kevin
      foaf_name: Park, Kevin
      foaf_surname: Park
  - foaf_Person:
      foaf_givenName: Chengcheng
      foaf_name: Xin, Chengcheng
      foaf_surname: Xin
  - foaf_Person:
      foaf_givenName: Jordy
      foaf_name: Davelaar, Jordy
      foaf_surname: Davelaar
  - foaf_Person:
      foaf_givenName: Zoltán
      foaf_name: Haiman, Zoltán
      foaf_surname: Haiman
      foaf_workInfoHomepage: http://www.librecat.org/personId=7c006e8c-cc0d-11ee-8322-cb904ef76f36
    orcid: 0000-0003-3633-5403
  bibo_doi: 10.1103/physrevd.111.063011
  bibo_issue: '6'
  bibo_volume: 111
  dct_date: 2025^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2470-0010
  - http://id.crossref.org/issn/2470-0029
  dct_language: eng
  dct_publisher: American Physical Society@
  dct_title: Self-lensing flares from black hole binaries. IV. The number of detectable
    shadows@
...