Streaming motions in the local universe - Evidence for large-scale, low-amplitude density fluctuations

Using a new set of Tully-Fisher distances for northern spirals, we show that the previously detected motion of the Perseus-Pisces region toward the Local Group is not solely produced by the Great Attractor. Rather, a significant fraction of its motion may arise from a large- scale, parallel streaming flow that includes all galaxies within a sphere out to at least 6000 km s^-1^ in radius around the Local Group. This finding is supported by a new bulk flow analysis that uses more than 3000 galaxies. The magnitude of this flow 360 +/- 40 km s^-1^, is consistent with COBE {DELTA}T/T fluctuations but inconsistent with present limits on {DELTA}T/T at 1^deg^ scale and potentially conflicting with a recent measurement of bulk flow on much larger scales.