2 micron spectroscopy of nearby galaxies and evidence for a late-phase starburst in NGC 4736

Astronomy and Astrophysics – Astronomy

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Galactic Evolution, Galactic Radiation, Infrared Spectroscopy, Starburst Galaxies, Active Galactic Nuclei, Carbon Monoxide, Local Group (Astronomy), Spectrum Analysis, Star Formation

Scientific paper

Spectra between 2.0 and 2.5 μm are reported for NGC 4736, M81, M31, M32, and NGC 3115. Together with previously published spectra of NGC 253 and M82, these data are used in a detailed analysis of NGC 4736. The CO bands in this galaxy are abnormally strong; it is suggested that this anomaly is the result of a very powerful but old starburst in the nucleus of NGC 4736. A number of other characteristics of the galaxy support this suggestion.

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