Abstract
Abstract The extragalactic background light (EBL) is the summed emission from sources beyond the Milky Way. An accurate measurement of the EBL can be used as a benchmark to search for any diffuse components in excess of the integrated light from galaxies. We have studied archival data from the Linear Etalon Imaging Spectral Array (LEISA) aboard the New Horizons spacecraft to assess its capability to measure the near-IR EBL at wavelengths between 1.2 and 2.5 μm. We estimate LEISAs sensitivity to diffuse brightness to be ∼105 nW m−2 sr−1 in 1.5 s exposures, which precludes the possibility of reaching EBL signals at the level of 10 nW m−2 sr−1.
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