Abstract: 
We present the measurement of light, strange and charm hadron triangular flow $v_3$ in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. The measurements were obtained at the STAR experiment at RHIC. The $D^0$ triangular flow, reconstructed using the first data set with the Heavy Flavor Tracker (HFT), is found to be finite at RHIC energies and consistent with number of constituent quark (NCQ) scaling observed for lighter species, suggesting charm quarks are taking part with the collective behavior in these collisions.

Proposed figures:

Figure 1: Invariant mass spectrum of $K\pi$ pairs in $1 < p_T < 8$ GeV/c together with fitnused to estimate significance

Figure 2:  a) $v_3$ vs. $p_T$ and b) $v_3/NCQ^{3/2}$ vs. $(m_T-m_0)/NCQ$ for $D^0$ in $0-80\%$ central events comparing with $K$, $\phi$, $p$, $\pi^+$ and $\Lambda$. $m_0$ is the mass of the particle, and $m_T=\sqrt{p_T^2+m_0^2}$. NCQ is short for Number of Constituent Quarks. The brackets represents systematic errors.

Summary:
In summary, $D^0$ $v_3$ is measured by STAR using the Heavy Flavor Tracker is carried out as a function of $p_T$ in $0-80\%$ Au+Au collisions at 200 GeV. The measured $v_3$ is finite.The comparison to the $v_3$ of light hadrons in the measured $p_T$ region suggests that charm quarks follow the same NCQ scaling, indicating charm is close to thermal equiliobrium in the medium created in Au+Au collisions at 200 GeV.