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Lenticular galaxies (S0s) were considered mainly as passive evolved spiralsdue to environmental effects for a long time; however, most S0s in the fieldcannot fit into this common scenario. In this work, we study one special case,SDSS J120237.07+642235.3 (PGC 38025), a star-forming field S0 galaxy with anoff-nuclear blue core. We present optical integral field spectroscopic (IFS)observation with the 3.5 meter telescope at Calar Alto (CAHA) Observatory, andhigh-resolution millimeter observation with the NOrthern Extended MillimeterArray (NOEMA). We estimated the star formation rate (SFR = 0.446 $M_\odotyr^{-1}$) and gaseous metallicity (12 + log(O/H) = 8.42) for PGC 38025, whichfollows the star formation main sequence and stellar mass - metallicityrelation. We found that the ionized gas and cold molecular gas in PGC 38025show the same spatial distribution and kinematics, whilst rotating misalignedwith stellar component. The off-nuclear blue core is locating at the sameredshift as PGC 38025 and its optical spectrum suggest it is \rm H\,{\sc ii}region. We suggest that the star formation in PGC 38025 is triggered by agas-rich minor merger, and the off-nuclear blue core might be a localstar-formation happened during the accretion/merger process.

PGC 38025: A Star-forming Lenticular Galaxy With an Off-nuclear Star-forming Core