NOAO >   Observing Info >   Approved Programs >   2005B-0398

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Proposal Information for 2005B-0398


PI: Ian Dell'Antonio, Brown University, ian@het.brown.edu
Address: Physics Department, Box 1843, Brown University, Providence, RI 02806, USA

CoI: David Wittman, University of California, Davis
CoI: Vera Margoniner, University of California, Davis
CoI: J. Anthony Tyson, University of California, Davis
CoI: Margaret Geller, Harvard-Smithsonian Center for Astrophysics

Title: Stellar and Dark Matter distributions at z=0.3: K-band imaging of the DLS F2 field

Abstract: We request 6 nights of time with the KP4M+FLAMINGOS to obtain K_s imaging of a 2x2 degree region of the Deep Lens Survey (DLS) that has a wealth of data from other wavelengths. This region (DLS field F2) has a complete weak lensing map revealing the mass concentrations at 0.2<z<0.7, stemming from the ultradeep BVRz' images of the DLS. Within the same region,we have obtained MMT spectroscopy of a sample of ~ 10000 galaxies with R_ap < 20.5, spanning the redshift range 0.05< z< 1. Chandra/XMM-Newton observations have also been obtained for 11% of the field (centered on the richest clusters), and the field is also the target of a Spitzer proposal to obtain mid-IR information on the higher-redshift galaxies and extend the SEDs of the lower-z galaxies (Wilson, PI). Here we propose complementary NIR imaging to K_s=19.5. This will allow us to measure the stellar content of the galaxies in the massive overdensities at z=0.2-0.5, to compare with the accurate weak lensing estimate (from the DLS) and the star formation rate estimates (from the spectroscopy). This will give a detailed picture of the evolution of the dark matter and baryons at intermediate redshifts. In addition, we will obtain halo-stellar mass relations for the spectroscopic sample by comparing the K_s magnitudes to the galaxy- galaxy lensing signal. Finally, we will be able to find high-redshift and highly reddened objects via their R-z'-K_s colors.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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