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Paper: Coordinated Galaxy Growth on Inner and Outer Disk Scales: Analysis of an Unusually Resonant S0 Galaxy and Its Companion
Volume: 393, New Horizons in Astronomy: Frank N. Bash Symposium 2007
Page: 267
Authors: Scarborough, T.; Kannappan, S.
Abstract: We present an unusual S0 galaxy with narrow, luminous, very blue inner and outer resonance rings along with a strong bar. Its dwarf companion at ΔX ∼ 30 kpc and ΔV ∼ < 30 km/s is also bright blue. We perform stellar population analysis of ugriz photometry to test the hypothesis of coeval interaction-triggered starbursts in both systems across a wide range of scales. We also investigate the possibility of nuclear activity. The rare combination of resonances in the primary galaxy may reflect a short-lived evolutionary state that is key to understanding coordinated bulge and disk growth, possibly as part of a transformation from a classical S0 to an S0 with a pseudobulge, or a later type galaxy.
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