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We present a detailed analysis of the single-slit optical spectrum of theFlat-Spectrum Radio Quasar (FSRQ) B2 0003+38A, taken by the EchelletteSpectrograph and Imager (ESI) on the Keck II telescope. This classicallow-redshift FSRQ ($z=0.22911$, as measured from the stellar absorption lines)remains underexplored in its emission lines, though its broad-band continuumproperties from radio to X-ray is well-studied. After removing the unresolvedquasar nucleus and the starlight from the host galaxy, we obtain aspatially-resolved 2-D spectrum, which clearly shows three components,indicating a rotating disk, an extended emission line region (EELR) and anoutflow. The bulk of the EELR, with a characteristic mass $M_{\rm EELR}\sim10^{7}~\rm M_{\odot}$, and redshifted by $v_{\rm EELR}\approx 120$ km s$^{-1}$with respect to the quasar systemic velocity, shows a one-sided structurestretching to a projected distance of $r_{\rm EELR}\sim 20$ kpc from thenucleus. The rotation curve of the rotating disk is well consistent with thatof a typical galactic disk, suggesting that the FSRQ is hosted by a diskgalaxy. This conclusion is in accordance with the facts that strong absorptionin the HI 21-cm line was previously observed, and that NaI$\lambda\lambda5891,5897$ and Ca II$\lambda\lambda3934,3969$ doublets aredetected in the optical ESI spectrum. B2 0003+38A will become the first FSRQdiscovered to be hosted by a gas-rich disk galaxy, if this is confirmed byfollow-up deep imaging and/or IFU mapping with high spatial resolution. Theseobservations will also help unravel the origin of the EELR.

B2 0003+38A: a classical flat-spectrum radio quasar hosted by a rotation-dominated galaxy with a peculiar massive outflow