Figures related to the paper draft id5123. Abstract:

The first measurement of the $\Upsilon(1{\rm S})$ elliptic flow coefficient ($v_2$) is performed at forward
rapidity (2.5~$<$~{\it y}~$<$~4.0) in Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$~TeV with
the ALICE detector at the LHC. The results are obtained with the scalar product method and are
reported as a function of transverse momentum (\pt) in the 5--60\% centrality interval. The measured $\Upsilon(1{\rm S})$ $v_2$ is consistent with zero within uncertainties in all considered \pt{} ranges in this centrality interval and is found to be compatible with the small values predicted by transport models. Furthermore, the obtained $v_2$ coefficient in 2~$<$~$p_{\rm T}$~$<$~15 GeV/$c$ is lower than that of inclusive \jpsi~mesons in the same \pt{} interval by 2.6 standard deviations, which supports different relative importance of production mechanisms of $\Upsilon(1{\rm S})$ and ${\rm J}/\psi$ in Pb--Pb collisions.