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Title: The Impact Of JWST Broadband Filter Choice On Photometric Redshift Estimation
Authors: Bisigello, L.
Caputi, K. I.
Colina, L.
Le Fevre, O.
Norgaard-Nielsen, H. U.
Perez-Gonzalez, P. G.
Pye, John
van der Werf, P.
Ilbert, O.
Grogin, N.
Koekemoer, A.
First Published: 2-Dec-2016
Publisher: IOP Publishing
Citation: Astrophysical Journal Supplement, 2016, 227 (2), 19
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 l > 5.0 mm . 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 l < 0.6 mm , 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 l < 0.6 mm 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 l < 0.6 mm and improves the redshift estimation. At z = 7–10, accurate zphot can be obtained with the NIRCam broadbands alone when S N 10  , but the zphot quality significantly degrades at SN 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.
DOI Link: 10.3847/0067-0049/227/2/19
ISSN: 0067-0049
eISSN: 1538-4365
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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