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We present the first sub-arcminute images of the Galactic Center above 10keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGRJ17456-2901 into non-thermal X-ray filaments, molecular clouds, point sourcesand a previously unknown central component of hard X-ray emission (CHXE).NuSTAR detects four non-thermal X-ray filaments, extending the detection oftheir power-law spectra with $\Gamma\sim1.3$-$2.3$ up to ~50 keV. Amorphological and spectral study of the filaments suggests that their originmay be heterogeneous, where previous studies suggested a common origin in youngpulsar wind nebulae (PWNe). NuSTAR detects non-thermal X-ray continuum emissionspatially correlated with the 6.4 keV Fe K$\alpha$ fluorescence line emissionassociated with two Sgr A molecular clouds: MC1 and the Bridge. Broad-bandX-ray spectral analysis with a Monte-Carlo based X-ray reflection modelself-consistently determined their intrinsic column density ($\sim10^{23}$cm$^{-2}$), primary X-ray spectra (power-laws with $\Gamma\sim2$) and set alower limit of the X-ray luminosity of Sgr A* flare illuminating the Sgr Aclouds to $L_X \stackrel{>}{\sim} 10^{38}$ erg s$^{-1}$. Above ~20 keV, hardX-ray emission in the central 10 pc region around Sgr A* consists of thecandidate PWN G359.95-0.04 and the CHXE, possibly resulting from an unresolvedpopulation of massive CVs with white dwarf masses $M_{\rm WD} \sim 0.9M_{\odot}$. Spectral energy distribution analysis suggests that G359.95-0.04 islikely the hard X-ray counterpart of the ultra-high gamma-ray source HESSJ1745-290, strongly favoring a leptonic origin of the GC TeV emission.

NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray Morphology and Spectroscopy of the Diffuse Emission