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The Lyman Alpha Reference Sample. XVI. Global 21cm HI properties of Lyman-alpha emitting galaxies.

<p>21cm maps and spectra of galaxies in the Lyman Alpha Reference Samples (LARS and eLARS). The field of view has been tailored to show the full extent of the main SoFIA 2 detection. In each FIgure, the top left panel shows DECaLS optical composite image with HI column density contours at level $1.0\times2^n \times10^{19}\,\textrm{cm}^{-2}$, with $n=0,1,2,...,5$ overlaid. The blue solid line shows the regions with SNR&gt;3. Contours fully included in the SNR&gt;3 mask are shown in white, low signal-to-noise contours are shown in gray. A gray cross indicates the position of the galaxy according to optical coordinates, a synthesized beam shaped aperture centred on these coordinates was used to extract HI properties in the center. The top right panel shows column density maps with the same contours as on the previous panel overlaid. The middle left pannel shows the moment-1 map. The middle right panel shows the linewidth map. The bottom pannel shows the total 21cm spectrum (gray) and beam-extracted 21cm spectrum (black). Velocity centroids are indicated by a vertical solid line, and velocity at half width on either side of the peaks by dashed lines, in either gray or black for the total or beam extraction respectively. In the Figure for eLARS05, the object on the bottom left of the top left panel is a separate detection by SoFIA-2.</p>