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We report the detection of a distant star-forming galaxy, ALMAJ010748.3-173028, which is identified by a 13-sigma emission line at 99.75 GHz(SdV = 3.1 Jy km/s), behind the nearby merging galaxies VV114 using the AtacamaLarge Millimeter/submillimeter Array (ALMA) Band 3. We also find an 880-umcounterpart with ALMA Band 7 (S_880um = 11.2 mJy). A careful comparison of theintensities of the line and the continuum suggests that the line is aredshifted 12CO transition. A photometric redshift analysis using the infraredto radio data favors a CO redshift of z = 2.467, although z = 3.622 isacceptable. We also find a hard X-ray counterpart, suggesting the presence of aluminous (L_X ~ 10^44 erg/s) active galactic nucleus obscured by a largehydrogen column (N_H ~ 2 x 10^23 cm^-2 if z = 2.47). A cosmological simulationshows that the chance detection rate of a CO-emitting galaxy at z > 1 with \ge1 Jy km/s is ~ 10^-3 per single ALMA field of view and 7.5-GHz bandwidth at99.75 GHz. This demonstrates that ALMA has sufficient sensitivity to find anemission-line galaxy such as ALMA J010748.3-173028 even by chance, although thelikelihood of stumbling across such a source is not high.

Serendipitous ALMA detection of a distant CO-emitting galaxy with a buried active galactic nucleus beyond the nearby merging galaxies VV114