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We analyse the M31 halo and its substructure within a projected radius of 120kpc using a combination of Subaru/HSC NB515 and CFHT/MegaCam g- & i-bands. Wesucceed in separating M31's halo stars from foreground contamination with$\sim$ 90 \% accuracy by using the surface gravity sensitive NB515 filter.Based on the selected M31 halo stars, we discover three new substructures,which associate with the Giant Southern Stream (GSS) based on their photometricmetallicity estimates. We also produce the distance and photometric metallicityestimates for the known substructures. While these quantities for the GSS arereproduced in our study, we find that the North-Western stream shows a steeperdistance gradient than found in an earlier study, suggesting that it is likelyto have formed in an orbit closer to the Milky Way. For two streams in theeastern halo (Stream C and D), we identify distance gradients that had not beenresolved. Finally, we investigate the global halo photometric metallicitydistribution and surface brightness profile using the NB515-selected halostars. We find that the surface brightness of the metal-poor and metal-richhalo populations, and the all population can be fitted to a power-law profilewith an index of $\alpha = -1.65 \pm 0.02$, $-2.82\pm0.01$, and $-2.44\pm0.01$,respectively. In contrast to the relative smoothness of the halo profile, itsphotometric metallicity distribution appears to be spatially non-uniform withnonmonotonic trends with radius, suggesting that the halo population hadinsufficient time to dynamically homogenize the accreted populations.

The structure of the stellar halo of the Andromeda galaxy explored with the NB515 for Subaru/HSC. I.: New Insights on the stellar halo up to 120 kpc