| We probe the structures embedded in the foreground Milky Way ISM and CGM using pairs of OB stars in the Large and Small Magellanic clouds. The UV spectra of the massive hot OB stars (130 in the LMC and 120 in the SMC) from various instruments (i.e., COS, FUSE, and STIS) have been archived as part of the Hubble director’s discretionary program ULLYSES. We have conducted a pilot study using a subset of the LMC targets observed with STIS and FUSE to assess the characteristics of the Al III, Si IV, C IV, and O VI bearing structures. The pairwise angular separation of the targets ranges between 0.002-6 degrees. Our analysis reveals the presence of statistically significant column density variation at all angular scales probed by the pilot sample. We also see a positive auto-correlation at sub-degree scales, indicating our smallest-separation sightlines probe scales smaller than the typical structures found in the foreground gas. |
