Common use of Left Clause in Contracts

Left. Median H I Lyα absorption as a function of transverse and LOS distance from ⟨z⟩ ≈ 2.4 star-forming galaxies. The bin size is 200 pkpc and the images have been smoothed by a 2-D Gaussian with FWHM equal to the bin size. The lower limit of the color scale corresponds to the median optical depth of all pixels, while the upper limit corresponds to the highest optical depth in the map. Absorption is clearly enhanced close to galaxies, out to at least 2 pMpc in the transverse direction, but only out to ≈ 1.5 pMpc along the LOS. This anisotropy suggests large-scale infall of gas. On the other hand, on small scales the absorption declines more rapidly in the transverse direction than in the LOS direction. Right: Results after randomizing the galaxy redshifts while keeping their impact parameters fixed. The fact that the correlation does not vary systematically with distance indicates that the features in the left panel are real. single pixel can be used multiple times: once for each galaxy whose separa- tion from the pixel falls within the range plotted. This is the first published 2-D absorption map around galaxies. The map shows a strong correlation between the Lyα absorption strength and the distance to the galaxies. The right panel of Figure 3.4 shows the same data, after randomizing the galaxy redshifts. We randomize the galaxy redshifts within the Lyα