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PHL 6625 is a luminous quasi-stellar object (QSO) at z = 0.3954 locatedbehind the nearby galaxy NGC 247 (z = 0.0005). Hubble Space Telescope (HST)observations revealed an arc structure associated with it. We report onspectroscopic observations with the Very Large Telescope (VLT) andmultiwavelength observations from the radio to the X-ray band for the system,suggesting that PHL 6625 and the arc are a close pair of merging galaxies,instead of a strong gravitational lens system. The QSO host galaxy is estimatedto be (4-28) x 10^10 M_sun, and the mass of the companion galaxy of isestimated to be M_* = (6.8 +/- 2.4) x 10^9 M_sun, suggesting that this is aminor merger system. The QSO displays typical broad emission lines, from whicha black hole mass of about (2-5) x 10^8 M_sun and an Eddington ratio of about0.01-0.05 can be inferred. The system represents an interesting and rare casewhere a QSO is associated with an ongoing minor merger, analogous to Arp 142.

PHL 6625: A Minor Merger-Associated QSO Behind NGC 247