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The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation

Abstract : The determination of galaxy redshifts in the James Webb Space Telescope’s (JWST) blank-field surveys will mostly rely on photometric estimates, based on the data provided by JWST’s Near-Infrared Camera (NIRCam) at 0.6-5.0 μm and Mid Infrared Instrument (MIRI) at λ > 5.0 μ {{m}}. In this work we analyze the impact of choosing different combinations of NIRCam and MIRI broadband filters (F070W to F770W), as well as having ancillary data at λ < 0.6 μ {{m}}, on the derived photometric redshifts (zphot) of a total of 5921 real and simulated galaxies, with known input redshifts z = 0-10. We found that observations at λ < 0.6 μ {{m}} are necessary to control the contamination of high-z samples by low-z interlopers. Adding MIRI (F560W and F770W) photometry to the NIRCam data mitigates the absence of ancillary observations at λ < 0.6 μ {{m}} and improves the redshift estimation. At z = 7-10, accurate zphot can be obtained with the NIRCam broadbands alone when {{S}}/{{N}}≥slant 10, but the zphot quality significantly degrades at {{S}}/{{N}}≤slant 5. Adding MIRI photometry with 1 mag brighter depth than the NIRCam depth allows for a redshift recovery of 83%-99%, depending on spectral energy distribution type, and its effect is particularly noteworthy for galaxies with nebular emission. The vast majority of NIRCam galaxies with [F150W] = 29 AB mag at z = 7-10 will be detected with MIRI at [F560W, F770W] < 28 mag if these sources are at least mildly evolved or have spectra with emission lines boosting the mid-infrared fluxes.
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Submitted on : Friday, May 13, 2022 - 3:09:30 PM
Last modification on : Saturday, June 25, 2022 - 3:17:12 AM

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L. Bisigello, K. I. Caputi, L. Colina, O. Le Fèvre, H. U. Nørgaard-Nielsen, et al.. The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation. The Astrophysical Journal Supplement Series, 2016, 227, ⟨10.3847/0067-0049/227/2/19⟩. ⟨insu-03667687⟩

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