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19 April 2024 |
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The impact of JWST broad-band filter choice on photometric redshift estimation | | L. Bisigello
; K. I. Caputi
; L. Colina
; O. Le Fèvre
; H. U. Nørgaard-Nielsen
; P. G. Pérez-González
; J. Pye
; P. van der Werf
; O. Ilbert
; N. Grogin
; A. Koekemoer
; | | Date: |
20 May 2016 | | Abstract: | The determination of galaxy redshifts in James Webb Space Telescope (JWST)’s
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 {mu}m and Mid
Infrared Instrument (MIRI) at {lambda}>5.0 {mu}m. In this work we analyse the
impact of choosing different combinations of NIRCam and MIRI broad-band filters
(F070W to F770W), as well as having ancillary data at {lambda}<0.6 {mu}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
{lambda}<0.6 {mu}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 {lambda}<0.6
{mu}m and improves the redshift estimation, both reducing the fraction of
high-z contaminants and preventing the leakage of high-z sources towards low z.
At z=7-10, accurate zphot can be obtained with the NIRCam broad bands alone
when S/N>=10, but the zphot quality significantly degrades at S/N<=5. Adding
MIRI photometry with one magnitude brighter depth than the NIRCam depth allows
for a redshift recovery of 83-99%, depending on SED 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. | | Source: | arXiv, 1605.6334 | | Services: | Forum | Review | PDF | Favorites | |
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