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The Green Bank Telescope (GBT) Diffuse Ionized Gas Survey (GDIGS) is afully-sampled radio recombination line (RRL) survey of the inner Galaxy atC-band (4-8 GHz). We average together ~15 Hn$\alpha$ RRLs within the receiverbandpass to improve the spectral signal-to-noise ratio. The average beam sizefor the RRL observations at these frequencies is ~2'. We grid these data tohave spatial and velocity spacings of 30" and 0.5 km/s, respectively. Here wediscuss the first RRL data from GDIGS: a six square-degree-area surrounding theGalactic HII region complex W43. We attempt to create a map devoid of emissionfrom discrete HII regions and detect RRL emission from the diffuse ionized gas(DIG) across nearly the entire mapped area. We estimate the intensity of theDIG emission by a simple empirical model, taking only the HII region locations,angular sizes, and RRL intensities into account. The DIG emission ispredominantly found at two distinct velocities: ~40 km/s and ~100 km/s. Whilethe 100 km/s component is associated with W43 at a distance of ~6 kpc, theorigin of the 40 km/s component is less clear. Since the distribution of the 40km/s emission cannot be adequately explained by ionizing sources at the samevelocity, we hypothesize that the plasma at the two velocity components isinteracting, placing the 40 km/s DIG at a similar distance as the 100 km/semission. We find a correlation between dust temperature and integrated RRLintensity, suggesting that the same radiation field that heats the dust alsomaintains the ionization of the DIG.

The GBT Diffuse Ionized Gas Survey: Tracing the Diffuse Ionized Gas around the Giant HII Region W43