Discovery of a Boxy Peanut Shaped Bulge in the Near Infrared

A. C. Quillen; L. E. Kuchinski; J. A. Frogel; D. L. DePoy

doi:10.1086/304054

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arXiv · astro-ph/9609042

Discovery of a Boxy Peanut Shaped Bulge in the Near Infrared

A. C. Quillen·L. E. Kuchinski·J. A. Frogel·D. L. DePoy

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Abstract

We report on the discovery of a boxy/peanut shaped bulge in the highly inclined barred Seyfert 2 galaxy NGC~7582. The peanut shape is clearly evident in near infrared $JHK$ images but obscured by extinction from dust in visible $BVR$ images. This suggests that near infrared imaging surveys will discover a larger number of boxy/peanut morphologies than visible surveys, particularly in galaxies with heavy extinction such as NGC~7582. The bulge in NGC~7582 exhibits strong boxiness compared to other boxy/peanut shaped bulges. If the starburst was mediated by the bar, then it is likely that the bar formed in less than a few bar rotation periods or a few $\times 10^8$ years ago. If the bar also caused the peanut, then the peanut would have formed quickly; on a timescale of a few bar rotation periods.

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A. C. Quillen, L. E. Kuchinski, J. A. Frogel, D. L. DePoy. 1997-01-15. Discovery of a Boxy Peanut Shaped Bulge in the Near Infrared. https://doi.org/10.1086/304054

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