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The Impact of JWST Broadband Filter Choice on Photometric Redshift Estimation

Bisigello, L., Caputi, K. I., Colina, L., Le Fèvre, O., Nørgaard-Nielsen, H. U., Pérez-González, P. G., Pye, J., Werf, P., Ilbert, O., Grogin, N. & Koekemoer, A., 1-Dec-2016, In : The Astrophysical Journal Supplement Series. 227, 2, 27 p., 19.

Research output: Contribution to journalArticleAcademicpeer-review

  • L. Bisigello
  • K. I. Caputi
  • L. Colina
  • O. Le Fèvre
  • H. U. Nørgaard-Nielsen
  • P. G. Pérez-González
  • J. Pye
  • P. Werf
  • O. Ilbert
  • N. Grogin
  • A. Koekemoer
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 \gt 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 \lt 0.6 μ {{m}}, on the derived photometric redshifts (z phot) of a total of 5921 real and simulated galaxies, with known input redshifts z = 0–10. We found that observations at λ \lt 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 \lt 0.6 μ {{m}} and improves the redshift estimation. At z = 7–10, accurate z phot can be obtained with the NIRCam broadbands alone when {{S}}/{{N}}≥slant 10, but the z phot 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] \lt 28 mag if these sources are at least mildly evolved or have spectra with emission lines boosting the mid-infrared fluxes.
Original languageEnglish
Article number19
Number of pages27
JournalThe Astrophysical Journal Supplement Series
Volume227
Issue number2
Publication statusPublished - 1-Dec-2016

    Keywords

  • galaxies: distances and redshifts, galaxies: high-redshift, galaxies: photometry, GOODS-SOUTH FIELD, WEBB-SPACE-TELESCOPE, EXTRAGALACTIC LEGACY SURVEY, LY-ALPHA EMITTERS, VLT DEEP SURVEY, KECK SPECTROSCOPY, MIDINFRARED INSTRUMENT, OPTICAL SPECTROSCOPY, STELLAR POPULATIONS, GALAXIES

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