NOAO >   Observing Info >   Approved Programs >   2009A-0107

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Proposal Information for 2009A-0107


PI: Daniel H. McIntosh, University of Missouri-Kansas City, mcintoshdh@umkc.edu
Address: Physics Department, 5110 Rockhill Road, Kansas City, MO 64110, USA

CoI: Anna Pasquali, Max Planck Institute for Astronomy
CoI: Frank van den Bosch, Max Planck Institute for Astronomy

Title: In Search of Remnants from Gas-Rich Major Mergers

Abstract: Gas-rich major mergers are dramatic examples of hierarchical galaxy formation that play a key role in leading theories invoking blue-to-red galaxy transformation to explain the strong buildup observed in the red spheroid population above \rm M_\star=10^10.5\rm M_\sun. These mergers are predicted to produce quenched blue spheroids that will redden as the latest new stars evolve. We propose 4 dark nights with the WIYN Mini-Mosaic to acquire B and V images down to 25.5 mag arcsec^-2 for a sample of 32 massive blue spheroid candidates identified in the SDSS. These observations will robustly separate the tidal signatures of recent, major merger-produced spheroids from heretofore undetected, LSB disks of ambiguous sources masquerading as blue spheroids in concentration-selected samples. This pilot sample will place strong observational constraints on the role of gas-rich major merging in the blue-to-red evolution of galaxies. \bf We are requesting replacement time for 100% losses to technical problems in 2008B.


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NOAO >   Observing Info >   Approved Programs >   2009A-0107

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