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Paper: Finding High-Redshift Lyman-Break Galaxies Lensed by z∼1 Galaxy Clusters
Volume: 525, 2020 Compendium of Undergraduate Research in Astronomy and Space Science
Page: 17
Authors: Denny, K.; Brodwin, M.; MaDCoWS Collaboration
Abstract: As light from distant galaxies propagates through the Universe, wavelengths blueward of (redshifted) 912 Å are absorbed by the intervening intergalactic hydrogen, producing a sharp continuum break. For high redshift galaxies, the expansion of the universe shifts this Lyman break into the observed-frame optical. This causes the objects to disappear in the bluest filter while still remaining prominent in redder ones. We can use the Lyman-Break technique to find high-redshift galaxies (z ≥ 3.5) lensed by z1 galaxy clusters. Finding these objects lensed by galaxy clusters can allow us to study the properties of high redshift galaxies, map out the dark matter concentrations of clusters, and build up statistics on the presence of gravitational arcs. Using the MaDCoWS survey of galaxy clusters at z1, we are currently analyzing a sample of potential Lyman-Break galaxies with photometry given by the optical Legacy Survey. We are using the optical g, r, and z bands to analyze color-color plots, and supplementing these with infrared IRAC images for broader SED information. Future work may include studies of lensed BzK galaxies, a selection that includes the passive population of high redshift galaxies.
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