Star formation history of barred disc galaxies
Patricia Sanchez-Blazquez (UAM), Pierre Ocvirk (Strasbourg), Brad K., Gibson (UCLan), Isabel Perez (UGr), Reynier F. Peletier (Kapteyn Institute)

TL;DR
This study investigates how bars influence the stellar content and evolution of galaxy discs, revealing that most stars are old and that bars formed early and persist, affecting age and metallicity gradients.
Contribution
It introduces spectral fitting techniques to accurately derive star formation histories and stellar population parameters in barred galaxies, reducing age-metallicity degeneracy issues.
Findings
Majority of stellar mass is old (~10 Gyr) across bulge and disc regions.
Bars formed long ago and influence bulge and disc stellar populations.
Disc growth follows a moderate inside-out formation scenario.
Abstract
We present the first results of a pilot study aimed at understanding the influence of bars on the evolution of galaxy discs through the study of their stellar content. We examine here the kinematics, star formation history, mass-weighted, luminosity-weighted, and single stellar population (SSP) equivalent ages and metallicities for four galaxies ranging from lenticulars to late-type spirals. The data employed extends to 2-3 disc scalelengths, with S/N(A)>50. Several techniques are explored to derive star formation histories and SSP-equivalent parameters, each of which are shown to be compatible. We demostrate that the age-metallicity degeneracy is highly reduced by using spectral fitting techniques --instead of indices-- to derive these parameters. We found that the majority of the stellar mass in our sample is composed of old (~10 Gyr) stars. This is true in the bulge and the disc…
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