Large-scale structure in a new deep IRAS galaxy redshift survey

We present here the first results from two recently completed, fully sampled redshift surveys comprising 3703 IRAS Faint Source Survey (FSS) galaxies. An unbiased counts-in-cells analysis finds a clustering strength in broad agreement with other recent redshift surveys and at odds with the standard cold dark matter model, We combine our data with those from the QDOT and 1.2-Jy surveys, producing a single estimate of the IRAS galaxy clustering strength. We compare the data with the power spectrum derived from a mixed dark matter universe. Direct comparison of the clustering strength seen in the IRAS samples with that seen in the APM-Stromlo survey suggests b(0)/b(I) = 1.20 +/- 0.05 assuming a linear, scale-independent biasing. We also perform a cell-by-cell comparison of our FSS-z sample with galaxies from the first CfA slice, testing the viability of a linear-biasing scheme linking the two. We are able to rule out models in which the FSS-z galaxies identically trace the CfA galaxies on scales of 5-20 h(-1) Mpc, On scales of 5 and 10 h(-1) Mpc no linear-biasing model can be found relating the two samples. We argue that this result is expected since the CfA sample includes more elliptical galaxies which have different clustering properties from spirals. On scales of 20 h(-1) Mpc no linear-biasing model with b(0)/b(I) < 1.70 is acceptable, When comparing the FSS-z galaxies with the CfA spirals, however, the two populations trace the same structures within our uncertainties.