  Two-particle angular correlations are sensitive probes to study the
interaction of jets with the flowing medium produced in heavy-ion collisions.
These interactions may appear as modifications of the near-side jet peak
compared to pp collisions. In these measurements, the associated per-trigger
yield is calculated from the relative azimuthal angle and pseudorapidity
between a trigger particle with higher $p_{\rm T}$ (1 GeV/c $ < p_{\rm T} < 8$
GeV/c) and an associated particle. Subsequently, the near-side peak width and
shape are extracted as a function of $p_{\rm T}$ and centrality. Results
obtained by the ALICE detector from Pb-Pb and pp collisions are presented. In
Pb-Pb collisions, a significant broadening of the peak in central events at low
$p_{\rm T}$ is observed in the data, and is more pronounced in the $\Delta\eta$
direction than in the $\Delta\varphi$ direction. A novel feature is also
observed at low $p_{\rm T}$ in central events: the peak departs from the
Gaussian shape, and a depletion around its center appears. To put the
broadening and the depletion in context with the strength of longitudinal,
radial and elliptic flow, the results are compared to AMPT simulations, which
suggest that radial and longitudinal flow play a significant role in the
appearance of the observed features.
