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We present a 155ks NuSTAR observation of the $z\sim2$ hot dust-obscuredgalaxy (hot DOG) W1835+4355. We extracted spectra from the two NuSTAR detectorsand analyzed them jointly with the archival XMM PN and MOS spectra. Weperformed a spectroscopic analysis based on both phenomenological andphysically motivated models employing toroidal and spherical geometry for theobscurer. In all the modelings, the source exhibits a Compton-thick columndensity $N_{\rm H} \gtrsim 10^{24}$ cm$^{-2}$, a 2-10 keV luminosity$L_{2-10}\approx2\times10^{45}$ erg s$^{-1}$ , and a prominent soft excess($\sim5-10$ % of the primary radiative output), which translates into aluminosity $\sim10^{44}$ erg s$^{-1}$. We modeled the spectral energydistribution from 1.6 to 850 $\mu m$ using a clumpy two-phase dusty torus modelplus a modified blackbody to account for emission powered by star formation inthe far-infrared. We employed several geometrical configurations consistentwith those applied in the X-ray analysis. In all cases we obtained a bolometricluminosity $L_{\rm bol}\approx3-5\times10^{47}$ erg s$^{-1}$, which confirmsthe hyperluminous nature of this active galactic nucleus. Finally, we estimatea prodigious star formation rate of $\sim$3000 $M_{\odot}\,yr^{-1}$, which isconsistent with the rates inferred for $z\approx2-4$ hyperluminous type Iquasars. The heavily obscured nature, together with $L_{\rm bol}$, the ratio ofX-ray to mid-infrared luminosity, the rest-frame optical morphology, and thehost star formation rate are indicative of its evolutionary stage. We caninterpret this as a late-stage merger event in the transitional,dust-enshrouded, evolutionary phase eventually leading to an optically brightAGN.

The hyperluminous Compton-thick $z\sim2$ quasar nucleus of the hot DOG W1835+4355 observed by NuSTAR