Optical and near-ir color gradients in the Cartwheel ring galaxy

Details Optical and near-ir color gradients in the Cartwheel ring galaxy Optical and near-ir color gradients in the Cartwheel ring galaxy

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26at...20..247v&link_type=abstract

Astronomical and Astrophysical Transactions, vol. 20, Issue 2, pp.247-251

Astronomy and Astrophysics

Astronomy

Galaxies, Colors, Star Formation

Scientific paper

Using the stellar population synthesis model, we analyze color properties of stellar populations produced by ring waves of propagating star formation and compare our results with the radial B-V/V-K color gradients observed in the archetype ring galaxy A0035-324, the Cartwheel. We find that young stellar populations, born from a ring wave of star formation propagating radially from the galactic center in a purely gaseous disk, exhibit much bluer colors than those observed in the Cartwheel galaxy. The presence of the older stellar populations extending up to the current location of the Cartwheel's outer ring is required to explain the observed radial color distribution in the galactic disk.

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