The IMACS Cluster Building Survey: V. Further Evidence for Starburst Recycling from Quantitative Galaxy Morphologies

Abstract

Using $J$ and $K_s$ band imaging obtained as part of the IMACS Cluster Building Survey (ICBS) we measure Sérsic indices for 2160 field and cluster galaxies at $0.31<z<0.54$. Using both mass- and magnitude-limited samples, we compare the distributions for spectroscopically determined passive, continuously starforming, starburst, and poststarburst systems and show that previously established spatial and statistical connections between these types extend to their gross morphologies. Outside of cluster cores, we find close structural ties between starburst and continuously starforming, as well as poststarburst and passive types, but not between starbursts and poststarbursts. These results independently support two conclusions presented in Paper II of this ICBS series (Dressler et al.): 1) most starbursts are the product of a non-disruptive triggering mechanism that is insensitive to global environment, such as minor-mergers; 2) starbursts and poststarbursts generally represent transient phases in the lives of "normal" starforming and quiescent galaxies, respectively, originating from and returning to these systems in closed "recycling" loops. In this picture, spectroscopically identified poststarbursts constitute a minority of all recently terminated starbursts, largely ruling-out the typical starburst as a quenching event in all but the densest environments.

14 pages, 10 figures; Accepted to ApJ September 2013. ArXiv version updated to reflect changes made during refereeing; results unchanged

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• After The Fall: The Dust and Gas in E+A Post-Starburst Galaxies
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• The diverse evolutionary pathways of post-starburst galaxies
• Hidden Starbursts and Active Galactic Nuclei at 0<z<4 from the Herschel-VVDS-CFHTLS-D1 Field: Inferences on Coevolution and Feedback
• The science of short exposures: Hubble SNAPshot observations of massive galaxy clusters
• How Robust Are the Size Measurements of High-redshift Compact Galaxies?
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• Tidal Interactions and Mergers in Intermediate Redshift EDisCS Clusters
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• Quenching in the Right Place at the Right Time: Tracing the Shared History of Starbursts, AGNs, and Post-starburst Galaxies Using Their Structures and Multiscale Environments
• Recently Quenched Galaxies at z = 0.2 - 4.8 in the COSMOS UltraVISTA Field