We present a new determination of the large-scale clustering of the CIV forest ( i.e. , the absorption due to all CIV absorbers ) using its cross-correlation with quasars in the Sloan Digital Sky Survey ( SDSS ) Data Release 12 ( DR12 ) .
We fit a linear bias model to the measured cross-correlation .
We find that the transmission bias of the CIV forest , b _ { Fc } , at a mean redshift of z = 2.3 , obeys ( 1 + \beta _ { c } ) b _ { Fc } = -0.024 \pm 0.003 .
Here , \beta _ { c } is the linear redshift space distortion parameter of the CIV absorption , which can only be poorly determined at \beta _ { c } = 1.1 \pm 0.6 from our data .
The most accurately determined combination marginalized over \beta _ { c } is ( 1 + 0.44 \beta _ { c } ) b _ { Fc } = -0.0170 \pm 0.0014 .
The transmission bias is related to the bias of CIV absorbers and their host halos , b _ { \tau c } , through the effective mean optical depth of the CIV forest , which we estimate at \bar { \tau } _ { c } ( z ) \simeq 0.01 from previous studies of the CIV equivalent width distribution .
We then find 1 < b _ { \tau c } < 1.7 , with the large error arising from uncertainties in \beta _ { c } and \bar { \tau } _ { c } .
This CIV bias is lower than the DLA bias b _ { DLA } \simeq 2 measured previously from the cross-correlation of DLAs and the Ly \alpha forest , indicating that most CIV absorbers are hosted by halos of lower mass than DLAs .
More accurate determinations of \bar { \tau } _ { c } ( z ) and \beta _ { c } are necessary to check this conclusion .