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Stellar streams have become central to studies of the interaction historiesof nearby galaxies. To characterize the most prominent parts of the stellarstream around the well-known nearby (d = 17 Mpc) edge-on disk galaxy NGC 5907,we have obtained and analyzed new, deep gri Subaru/Suprime-Cam and 3.6 micronSpitzer/Infrared Array Camera (IRAC) observations. Combining the near-infrared3.6 micron data with visible-light images allows us to use a long wavelengthbaseline to estimate the metallicity and age of the stellar population along a~60 kpc long segment of the stream. We have fitted the stellar spectral energydistribution (SED) with a single-burst stellar population synthesis model andwe use it to distinguish between the proposed satellite accretion andminor/major merger formation models of the stellar stream around this galaxy.We conclude that a massive minor merger (stellar mass ratio of at least 1:8)can best account for the metallicity of -0.3 inferred along the brightest partsof the stream.

Metallicity and Age of the Stellar Stream Around the Disk Galaxy NGC 5907