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We evaluate the emission that must arise due to reflection of the putativecollimated X-ray radiation of SS 433 by atomic gas and molecular clouds in theGalactic plane and compare the predicted signal with existing RXTE and ASCAdata for the region of interest. Assuming that the intrinsic X-ray spectrum ofSS 433 is similar to that of ultraluminous X-ray sources (ULXs), we obtain anupper limit of $\sim 2\times 10^{39}$ erg s$^{-1}$ on its total(angular-integrated) luminosity in the 2--10 keV energy band, which is onlyweakly dependent on the half-opening angle, $\Theta_r$, of the emission cone.In contrast, the upper limit on the apparent luminosity of SS 433 (that wouldbe perceived by an observer looking at its supercritical accretion diskface-on) decreases with increasing $\Theta_r$ and is $\sim 3\times 10^{40}$ ergs$^{-1}$ for $\Theta_r\gtrsim\Theta_p=21\deg$, where $\Theta_p$ is theprecession angle of the baryonic jets (assuming that the emission cones precessin the same manner as the jets). This leaves open the possibility that SS 433is a misaligned ULX. Further investigation of the reflection signal from themolecular clouds using higher angular resolution observations could improvethese constraints with the potential to break the degeneracy between $ \Theta_r$ and the apparent luminosity.

Is SS 433 a misaligned ultraluminous X-ray source? Constraints from its reflected signal in the Galactic plane