  We present a study of charm and beauty isolation based on a data-driven
method with recent measurements on heavy flavor hadrons and their decay
electrons in Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV at RHIC. The
individual electron $p_{\rm T}$ spectra, $R_{\rm AA}$ and $v_2$ distributions
from charmed and beauty hadron decays are obtained. We find that the electron
$R_{\rm AA}$ from beauty hadron decays ($R_{\rm AA}^{\rm b\rightarrow e}$) is
suppressed in minimum bias Au+Au collisions but less suppressed compared with
that from charmed hadron decays at $p_{\rm T}$ $>$ 3.5 GeV/$c$, which indicates
that beauty quark interacts with the hot-dense medium with depositing its
energy and is consistent with the mass-dependent energy loss scenario. For the
first time, the non-zero electron $v_2$ from beauty hadron decays ($v_2^{\rm
b\rightarrow e}$) at $p_{\rm T}$ $>$ 3.0 GeV/$c$ is observed and shows smaller
elliptic flow compared with that from charmed hadron decays at $p_{\rm T}$ $<$
4.0 GeV/$c$. At 2.5 GeV/$c$ $<$ $p_{\rm T}$ $<$ 4.5 GeV/$c$, $v_2^{\rm
b\rightarrow e}$ is smaller than a number-of-constituent-quark (NCQ) scaling
hypothesis. This suggests that beauty quark is unlikely thermalized and too
heavy to be moved in a partonic collectivity in heavy-ion collisions at the
RHIC energy.
