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We investigate the spatial distribution of Lyman-$\alpha$ (Ly $\alpha$)absorbers within cosmic voids. We create a catalogue of cosmic voids in SloanDigital Sky Survey Data Release 7 (SDSS DR7) with the VoidFinder algorithm ofthe Void Analysis Software Toolkit (VAST). Using the largest catalogue oflow-redshift (z $\leq$ 0.75) IGM absorbers to date, we identify 392 Ly $\alpha$absorbers inside voids. The fraction of Ly $\alpha$ absorbers inside voids (65per cent) is comparable to the volume filling fraction of voids (68 per cent),and significantly greater than the fraction of galaxies inside voids (21 percent). Inside voids, the spatial distribution of Ly $\alpha$ absorbers differsmarkedly from that of galaxies. Galaxy density rises sharply near void edges,while Ly $\alpha$ absorber density is relatively uniform. The radialdistribution of Ly $\alpha$ absorbers inside voids differs marginally from arandom distribution. We find that lower column density Ly $\alpha$ absorbersare more centrally concentrated inside voids than higher column density Ly$\alpha$ absorbers. These results suggest the presence of two populations of Ly$\alpha$ absorbers: low column density systems that are nearly uniformlydistributed in the interiors of voids and systems associated with galaxies atthe edges of voids.

HST /COS Lyman-alpha Absorbers in Cosmic Voids