Confirmation of Intervening Filaments of Galaxies at the Redshifts of
  $Chandra$ WHIM Absorption Features
  We report the $a~posteriori$ confirmation of two large-scale filaments along
the sight-line of the blazar 1ES~1553+113, which correspond to Warm-Hot
Intergalactic Medium (WHIM) absorption features in the X-ray and far
ultraviolet. We use the WISE-SuperCOSMOS photometric catalog to map the
cosmic-web in the direction of the blazar, and find significant filaments at
redshifts of $z=0.23\pm0.02$ and $z=0.31\pm0.02$, which roughly align with the
absorption redshifts. A third X-ray absorption feature at $z_X=0.133$ did not
have any corresponding structures in the photometric catalog.
