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Abstract: IRAC excels at detecting distant objects. Due to a combination of the shapesof the spectral energy distributions of galaxies and the low backgroundachieved from space, IRAC reaches greater depth in comparable exposure time at3.6 and 4.5 micron than any ground- or space-based facility currently can at2.2 micron. Furthermore, the longer wavelengths probed by IRAC enable studiesof the rest-frame optical and near-infrared light of galaxies and AGN to muchhigher redshift than is possible from the ground. This white paper explores themerits of different survey strategies for studying the distant universe duringthe warm mission. A three-tiered approach serves a wide range of science goalsand uses the spacecraft effectively: 1 an ultra-deep survey of ~0.04 squaredegrees to a depth of ~250 hrs in conjunction with an HST-WFC3 program, tostudy the Universe at 76 and characterize therelation between the build-up of dark matter halos and their constituentgalaxies at 2


Author: Pieter van Dokkum, Asantha Cooray, Ivo Labbe, Casey Papovich, Daniel Stern

Source: https://arxiv.org/







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