NOAO >   Observing Info >   Approved Programs >   2014A-0209

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Proposal Information for 2014A-0209


PI: Douglas Clowe, Ohio University, clowe@ohio.edu
Address: Physics Department, Clippinger Labs 251-B, Athens, OH 45701, USA

CoI: Melville Ulmer, Northwestern University

Title: Weak lensing observations of a galaxy filament

Abstract: We propose to perform deep pODI imaging in g, r, and i in order to carry out a weak lensing map of a dark matter mass filament between two rich cluster of galaxies: Abell 1560 and MS1231.3+1542. These clusters are separated by about 12^\prime in the sky and are at nearly the same redshift of 0.24. Based on the XMM-Newton X-ray image plus SDSS galaxy counts, it is highly likely there is a mass filament connecting these two clusters, whose projected mass per solid angle is strong enough to give us only the third reliable measurement of the mass of such a filament. The results will give us a valuable measure of cosmic variance in the baryon fractions of filaments. In addition, A1560 also potentially is an ongoing merger, and the comparison of weak lensing measurements to the X-ray emission and optical galaxy counts will provide further constraints on the nature of dark matter and gravity models. All of this can then be used to test models of hierarchical build up of large scale structures and filaments in the Universe as predicted by LCDM simulations.


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NOAO >   Observing Info >   Approved Programs >   2014A-0209

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