Extended Data Fig. 3: GTC/MEGARA maps.
From: A nebular origin for the persistent radio emission of fast radio bursts
a, Galactic extinction corrected Hα emission line map. b, Map of the intrinsic E(B − V) of the galaxy. We estimated the intrinsic E(B − V) taking into account galactic dust extinction and using the Balmer decrement (Hα/Hβ). In cases in which the Hβ significance falls below a 2σ threshold, no accurate correction for dust extinction is possible. For these pixels, we give a lower limit for the intrinsic E(B − V), shown in greyscale. Note that the tick labels above the two colour bars represent lower limits and actual E(B − V) values for greyscale and coloured pixels, respectively. c, Maps of the emission lines [NII] 6584, Hβ and [OIII] 5007. In cases in which the line significance falls below 2σ we give an upper limit and represent these pixels in greyscale. The tick labels above the two colour bars represent upper flux limits and actual flux values for greyscale and coloured pixels, respectively. The red and black crosses represent the FRB and galactic centre, respectively. The magenta rectangle defines the galactic region encompassing six adjacent MEGARA pixels surrounding the FRB and PRS zone. For all of the maps, pixels with an Hα significance below a 3σ threshold are omitted.
