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We present the first results of the Subaru/Hyper Suprime-Cam (HSC) survey ofthe interacting galaxy system, NGC4631 and NGC4656. From the maps of resolvedstellar populations, we identify 11 dwarf galaxies (including already-knowndwarfs) in the outer region of NGC4631 and the two tidal stellar streams aroundNGC4631, named Stream SE and Stream NW, respectively. This paper describes thefundamental properties of these tidal streams. Based on the tip of red giantbranch method and the Bayesian statistics, we find that StreamSE (7.10 Mpc inExpected a posteriori, EAP, with the 90% credible intervals of [6.22, 7.29]Mpc) and StreamNW (7.91 Mpc in EAP with the 90% credible intervals of [6.44,7.97] Mpc) are located in front of and behind NGC4631, respectively. We alsocalculate the metallicity distribution of stellar streams by comparing themember stars with theoretical isochrones on the color-magnitude diagram. Wefind that both streams have the same stellar population based on the Bayesianmodel selection method, suggesting that they originated from a tidalinteraction between NGC4631 and a single dwarf satellite. The expectedprogenitor has a positively skewed metallicity distribution function with[M/H]_EAP=-0.92 with the 90% credible intervals of [-1.46, -0.51]. The stellarmass of the progenitor is estimated as 3.7 x 10e+8 Msun with the 90% credibleintervals of [5.8 x 10e+6, 8.6 x 10e+9] Msun based on the mass-metallicityrelation for Local group dwarf galaxies. This is in good agreement with aninitial stellar mass of the progenitor presumed in the previous N-bodysimulation.

Resolved stellar streams around NGC4631 from a Subaru/Hyper Suprime-Cam survey