Extended Data Fig. 6: Fit to the line profiles of H2 lines associated with the proximate absorber at z = 2.662 towards J 012555.11−012925.00.
From: Quasar radiation transforms the gas in a merging companion galaxy
The black lines represent the observed normalized spectrum, with the error bars representing the standard deviation. The green, violet, and red stripes indicate the profiles of H2 components A, B, and the total profile, respectively. Black and green dashed horizontal lines at the bottom of each panel show the zero flux level and partial coverage, respectively. Blue step-like lines at the top of each panel display the residuals, with horizontal lines representing − 2σ, 0, and 2σ levels. Red horizontal segments identify the band (Lyman/Werner, vibrational level of upper and lower state) as well as main rotational levels (numbers above ticks, only shown for component A for clarity). Note that lines from low rotational levels in the L2-0 band (around 3950 Å) are blended with the strong Lyα line from intervening H I at z = 2.25, identified through its associated metal transitions.
