| The Sunburst Arc (z~2.37) is a confirmed Lyman continuum leaker galaxy and has been uniquely lensed where its single leaking region is imaged 12 times over four separate arcs. Using HST/WFC3 UVIS G280 grism observations, we extracted the spectra of the leaking region and identified three foreground absorbers at z~2 seen in multiple images. The plethora of sightlines allows us to probe these absorbers at extremely small separations (< 2 kpc), constraining the physical cloud sizes in 2D and estimating their HI mass. Two of the absorbers exhibit strong CIV column densities; these multiphase clouds are likely within the CGM of foreground galaxy halos. The final absorber is likely within the IGM. These are the first size measurements of CGM and IGM cloud sizes at z~2, giving us insight into the physical conditions of the gas flows around galaxies during the peak of star formation in the universe. |
