  The spatial cluster-galaxy correlation amplitude, Bgc, is computed for a set
of 76 (z < 0.3) ultraluminous infrared galaxies (ULIRGs) from the 1-Jy sample.
The Bgc parameter is used to quantify the richness of the environment within
0.5 Mpc of each ULIRG. We find that the environment of local ULIRGs is similar
to that of the field with the possible exceptions of a few objects with
environmental densities typical of clusters with Abell richness classes 0 and
1. No obvious trends are seen with redshift, optical spectral type, infrared
luminosity, or infrared color. We compare these results with those of local
AGNs and QSOs at various redshifts. The 1-Jy ULIRGs show a broader range of
environments than local Seyferts, which are exclusively found in the field. The
distribution of ULIRG Bgc-values overlaps considerably with that of local QSOs,
consistent with the scenario where some QSOs go through a ultraluminous
infrared phase. However, a rigorous statistical analysis of the data indicates
that these two samples are not drawn from the same parent population. The Bgc
distribution of QSOs shows a distinct tail at high Bgc-values which is not
apparent among the ULIRGs. This difference is consistent with the fact that
some of the QSOs used for this comparison have bigger and more luminous hosts
than the 1-Jy ULIRGs.
