STECKMAP: STEllar Content and Kinematics from high resolution galactic spectra via Maximum A Posteriori
Résumé
We use single stellar populations (SSPs) from PÉGASE-HR (R= 10000, λ= 4000-6800 Å, from Le Borgne et al.) to test the method through realistic simulations. Non-Gaussianities in LOSVDs are reliably recovered with signal-to-noise ratio (SNR) as low as 20 per 0.2 Åpixel. It turns out that the recovery of the stellar content is not degraded by the simultaneous recovery of the kinematic distribution, so that the resolution in age and error estimates given in Ocvirk et al. remain appropriate when used with STECKMAP.
We also explore the case of age-dependent kinematics (i.e. when each stellar component has its own LOSVD). We separate the bulge and disc components of an idealized simplified spiral galaxy in integrated light from high-quality pseudo-data (SNR = 100 per pixel, R= 10000), and constrain the kinematics (mean projected velocity, projected velocity dispersion) and age of both components.
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