Approximately half of the Universe ’ s baryons are in a form that has been hard to detect directly .
However , the missing component can be traced through the cross-correlation of the thermal Sunyaev-Zeldovich ( tSZ ) effect with weak gravitational lensing .
We build a model for this correlation and use it to constrain the extended baryon component , employing data from the Canada France Hawaii Lensing Survey and the Planck satellite .
The measured correlation function is consistent with an isothermal \beta -model for the halo gas pressure profile , and the 1- and 2-halo terms are both detected at the 4 \sigma level .
In addition , we measure the hydrostatic mass bias ( 1 - b ) = 0.79 ^ { +0.07 } _ { -0.10 } , which is consistent with numerical simulation results and the constraints from X-ray observations .
The effective temperature of the gas is found to be in the range ( 7 \times 10 ^ { 5 } – 3 \times 10 ^ { 8 } ) K , with approximately 50 \% of the baryons appearing to lie beyond the virial radius of the halos , consistent with current expectations for the warm-hot intergalactic medium .