Fig. 5: MUSE Spectrum of W0410-0913.

a We show a spectrum of W0410-0913, covering the full MUSE wavelength domain, extracted from a circular aperture with a 1″-radius. Vertical red lines are located at the expected position of several rest-frame UV lines, according to its redshift (as traced by the rest-frame FIR lines). A sigma-clipping procedure was performed to remove the residuals of sky-lines and make the visualization easier. Nvλ 1240 and Civλλ 1548,1550 show very broad line-profiles (FWHM~2800 km s⁻¹) and large blueshifts (−2000 km s⁻¹) with respect to W0410-0913, indicative of fast nuclear outflows. A narrow Lyman-α line (FWHM~400 km s⁻¹) is detected with an offset of ~−1460 km s⁻¹ from the systemic redshift. b We show a zoom of the spectrum at wavelengths closer to the expected Lyman-α line.