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We study untriggered di-hadron correlations in Pb+Pb at 2.76 TeV, based on anevent-by-event simulation of a hydrodynamic expansion starting from flux tubeinitial conditions. The correlation function shows interesting structures as afunction of the pseudorapidity difference $\Delta\eta$ and the azimuthal angledifference $\Delta\phi$, in particular comparing different centralities. We canclearly identify a peak-like nearside structure associated with very lowmomentum components of jets for peripheral collisions, which disappears towardscentral collisions. On the other hand, a very broad ridge structure fromasymmetric flow seen at central collisions, gets smaller and finally disappearstowards peripheral collisions.

Ridges and Soft Jet Components in Untriggered Di-hadron Correlations in Pb+Pb Collisions at 2.76 TeV