NOAO > Observing Info > Approved Programs > 2009B-0174
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NOAO > Observing Info > Approved Programs > 2009B-0174 |
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PI: Ross Fadely, Rutgers University, fadely@physics.rutgers.edu
Address: Physics Department, 136 Frelinghuysen Rd., Piscataway, 08854 08854, US
CoI: Charles R. Keeton, Rutgers University
Title: Testing CDM with Substructure Gravitational Lensing
Abstract:
We propose Gemini K and L' band imaging of 14 gravitationally lensed
quasars to investigate the presence of cold dark matter (CDM)
substructure. N-body simulations predict that galaxy and cluster halos
contain a myriad of subhalos, many of which may be dark. Due to lensing
on micro- and milli-arcsecond scales, flux ratios across different
wavelengths (corresponding to different source sizes) are sensitive to
substructure in halos. An on-going investigation of data taken at
Gemini North in semester 2008B has revealed that new infrared
measurements, in conjunction with existing optical and radio data, can
powerfully constrain the existence and nature of subhalo perturbers to
lensing potentials. Our proposed Gemini observations will dramatically
improve the existing sample of millilensing measurements of
substructure, allowing new statistical tests of CDM predictions.
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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NOAO > Observing Info > Approved Programs > 2009B-0174 |
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