Fig. 4.
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Zoom-in on the Hα and [N II]λ6585 emission lines in the G235H/F170LP grating. The best-fit model is overlaid in red, with the Hα broad component highlighted in green. The inclusion of such a component significantly improves the fit, with a ΔBIC ≫ 10 compared to the one-component fit. The Hα broad component (FWHM = 445 km s−1) is blueshifted from the systemic redshift by ∼70 km s−1, possibly tracing outflowing gas in the galaxy.
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