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Paper: The Impact of Nebular Emission on the Broadband Fluxes of High Redshift Galaxies
Volume: 396, Formation and Evolution of Galaxy Disks
Page: 435
Authors: Zackrisson, E.; Bergvall, N.; Leitet, E.
Abstract: A substantial fraction of the light emitted by young or starforming galaxies at ultraviolet to near-infrared wavelengths comes from the ionized interstellar medium in the form of emission lines and nebular continuum. At high redshifts, star formation rates are on average higher and stellar populations younger than in the local Universe. Both of these effects act to boost the impact of nebular emission on the overall spectrum of galaxies. Even so, the broadband fluxes and colors of high-redshift galaxies are routinely analyzed assuming that the light observed originates directly from stars. Here, we assess the reliability of this approach, by deriving the ratio of nebular-to-stellar light for three different broadband filters (R, H and the Spitzer/IRAC 5.8 μm filter) and redshifts up to z = 15.
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