Fig. 4.
Download original image
Flux density in velocity space of the Hα and Lyα lines of A2744-45924, centered on the systemic velocities of the two lines at z = 4.464. The ratio of the line fluxes is Lyα/Hα = 0.066. In addition, Hα has a prominently broad profile (FWHM ≈ 4500 km s−1; Labbe et al. 2024), while Lyα presents the classical shape of a single narrow red peak (FWHM = 270 km s−1; see Fig. 3).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.