Fig. 2: The Eos cloud seen in tracers other than H2 fluorescence.
From: A nearby dark molecular cloud in the Local Bubble revealed via H2 fluorescence
The magenta contours in all images represent the H2 emission contour from the fluorescent emission in Fig. 1. Top left: total extinction derived by integrating the Dustribution density along the line of sight. Top middle: column density (NH) map of the Eos cloud derived from Planck 545 GHz data26 assuming T = 10 K, (Planck dust emissivity coefficient) κν = 4.73 cm2 g−1 and a distance of 100 pc. Top right: GALFA-H i column density map15. Bottom left and middle: ROSAT 0.25-keV (left) and 1-keV (middle) maps from ref. 34. The Eos cloud shows a prominent outline absorbing the soft-X-ray flux and creating a bright X-ray halo towards lower Galactic longitude. The interaction region provides a nearby example of a hot–cold gas interface. Bottom right: CO data from ref. 6; the small CO-bright region (known as MBM 40) within the on-sky cloud boundary is shown by the white arrow.
