Stellar populations in barred spirals |
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| Authors: | Simon Cantin Carmelle Robert Anne Pellerin Mercedes Moll |
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| Institution: | aDépartement de physique, de génie physique et d’optique, Université Laval, and Observatoire du mont Mégantic, Qué., Canada;bDepartamento de Fusión y Física de Partículas Elementales, CIEMAT Avda, Complutense 22, 28040 Madrid, Spain;cSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA |
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| Abstract: | OASIS observations obtained at the Canada–France–Hawaii Telescope for the spiral galaxies NGC 4900 and NGC 5430 produce one spectrum for each 0.41″ element of the 11″ × 15″ field of view. This allows for the spatial characterisation of the different stellar populations. From these observations we study the young ( 10 Myr) and older stellar populations using evolutionary synthesis codes. Based on the gas emission lines, we find that the young populations are located in relatively small regions and dominate the integrated flux. In NGC 4900, the young populations are distributed in a bar-like structure featuring a hole near the position of the galaxy’s centre. The young stellar populations of NGC 5430 form a nuclear ring and two patches at the base of the spiral arms. Based on Mg2 and FeI absorption lines, we find that in both galaxies, the young stars are superimposed on a relatively homogenous population of a few Gyr. |
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| Keywords: | Galaxies: evolution Galaxies: individual(NGC 4900 NGC 5430) Galaxies: spiral Galaxies: starburst Galaxies: stellar content |
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