Poster Presentation
Quasar-LBG two-point angular cross-correlation function at z~4 in the COSMOS field
We present the two-point angular cross-correlation function (CCF) of Lyman-break galaxies (LBGs) and low-luminosity quasars at -24<M_1450<-22 in the redshift range 3.1<z<4.5 in the COSMOS field.
We used 16 spectroscopically confirmed low-luminosity quasars and 835 color-selected LBGs at z~4. The bias factor for low-luminosity quasars at z~4 is derived, by utilizing the quasar-LBG CCF and the LBG auto-correlation function.
The bias factor of the low-luminosity quasars is 5.81+7.77/-4.13, when
LBGs in the magnitude ranges of z'<25.0 are examined. The inferred bias factor for low-luminosity quasars at z~4 corresponds to the mass of the dark matter halo is ~10^{12.0-12.5} h^{-1} M_sun, which is generally consistent with that for luminous quasars (M_1450<-24) which have been examined in previous clustering studies at a similar redshift range and also at lower redshifts. This result suggests that the triggering mechanism of low-luminosity quasars at z~4 is similar to that of z~4 luminous quasars.
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