Ionized and cold gas components in low surface brightness galaxy AGC 102004

We present the integral field spectroscopic observations of ionized gas (Hα and [{{N}{II}}]) using the PCWI, along with deep CO(2-1) observations by the ^ Ū^ ū receiver on JCMT for AGC 102004. The velocity field of Hα shows an anomalous distribution in the North-Western (NW) disk. The Hα spectrum is well-fitted by two Gaussian components, and the weak Gaussian component is dominated by the anomalous Hα in the NW disk. The Gaussian fit center of Hα emission is offset by +24.2 km s⁻¹ from the systemic velocity obtained from the HI emission. We derive the gas-phase metallicity, 12+log(O/H), using [{{N}{II}}]λ6583/Hα ratio as a proxy. The mean value of 12+log(O/H) is 8.30 ± 0.19 over the whole galaxy. The metallicity in the outer disk is lower than the detection limit of 7.72, indicating the metallicity gradient exists in AGC 102004. We speculate a minor/mini-merger event could have happened to the NW disk. CO(2-1) emission has non-detection in AGC 102004, reaching a noise level of 0.33 mK smoothed to 30 km s⁻¹. The upper limit of molecular gas mass in AGC 102004 is 2.1 × 10⁷ M with XCO = 3.02×10²⁰ cm⁻² (K km s⁻¹)⁻¹. The MH₂/MᶜᵒʳʳHI of AGC 102004 is lower than 0.0037 and lower than that of normal galaxies.