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Recent work has shown that the local non-Gaussianity parameter f_NL induces ascale-dependent bias, whose amplitude is growing with scale. Here we firstrederive this result within the context of peak-background split formalism andshow that it only depends on the assumption of universality of mass function,assuming halo bias only depends on mass. We then use extended Press-Schechterformalism to argue that this assumption may be violated and the scale dependentbias will depend on other properties, such as merging history of halos. Inparticular, in the limit of recent mergers we find the effect is suppressed.Next we use these predictions in conjunction with a compendium of large scaledata to put a limit on the value of f_NL. When combining all data assuming thathalo occupation depends only on halo mass, we get a limit of -29 ~ (-65)< f_NL< +70 ~(+93) at 95% (99.7%) confidence. While we use a wide range of datasets,our combined result is dominated by the signal from the SDSS photometric quasarsample. If the latter are modeled as recent mergers then the limits weaken to-31 ~(-96) < f_NL < +70 ~ (+96) . These limits are comparable to the strongestcurrent limits from the WMAP 5 year analysis, with no evidence of a positivesignal in f_NL. While the method needs to be thoroughly tested against largescale structure simulations with realistic quasar and galaxy formation models,our results indicate that this is a competitive method relative to CMB andshould be further pursued both observationally and theoretically.

Constraints on local primordial non-Gaussianity from large scale structure