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Stellar Populations in the Antennae (NGC 4038/9): Exploring a Galaxy Merger Pixel By Pixel

Published online by Cambridge University Press:  03 August 2017

Susan A. Kassin
Affiliation:
Department of Astronomy, 140 West 18th Avenue, Ohio State University, Columbus, OH 43210; kassin@astronomy.ohio-state.edu
Jay A. Frogel
Affiliation:
Department of Astronomy, 140 West 18th Avenue, Ohio State University, Columbus, OH 43210; kassin@astronomy.ohio-state.edu
Richard W. Pogge
Affiliation:
Department of Astronomy, 140 West 18th Avenue, Ohio State University, Columbus, OH 43210; kassin@astronomy.ohio-state.edu

Abstract

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We use B, V, and K-band images of the Antennae in a detailed analysis of its stellar populations. Significant large and small-scale spatial variations in the stellar populations are found by examining images pixel by pixel. Flux ratio, or linear color, diagrams allow us to find the stellar populations present in each pixel using a novel technique. This is done through a comparison of the colors of pixels to those of well-studied populations such as elliptical/S0 galaxies, Magellanic Cloud clusters, and Sc galactic nuclei, in addition to stellar population models. This technique allows us to study not only star clusters, but also the diffuse light present in the Antennae. From these flux-ratio diagrams, a luminosity-weighted de-reddened age image of the Antennae is constructed. Our analysis technique complements and extends results based on Hubble Space Telescope images.

Type
Part 3. Super Star Clusters and Associations
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

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