Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1780522 | New Astronomy Reviews | 2006 | 11 Pages |
Abstract
OASIS observations obtained at the Canada-France-Hawaii Telescope for the spiral galaxies NGC 4900 and NGC 5430 produce one spectrum for each 0.41â³ element of the 11â³Â à15â³ 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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Physics and Astronomy
Astronomy and Astrophysics
Authors
Simon Cantin, Carmelle Robert, Anne Pellerin, Mercedes Mollá,