Simulations to study the influence of the stellar populations and the S/N on the measurement of the radial velocities. We plot the relative uncertainty when measuring the radial velocities Δv/v, defined as (vo − vi)/vi) as a function of the S/N. Only the results for the radial velocity v = 1500 km s-1 are shown because the offsets and errors found are independent of the radial velocity of the galaxy. The results plotted are for a typical dwarf galaxy with velocity dispersion of 40 km s-1 and metallicity −0.4. The velocity dispersion does not have any effect on either the measurement of radial velocities or the metallicities. Note the different scale in the y-axis compared to Figs. 2 and 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.