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Statistical Stellar Mass Corrections for High-z Galaxies Observed with JWST Broadband Filters Due to Template Degeneracies

Bisigello, L., Caputi, K. I., Colina, L., Pérez-González, P. G., Koekemoer, A., Le Fèvre, O., Grogin, N., Nørgaard-Nielsen, H. U. & van der Werf, P., 1-Aug-2019, In : The Astrophysical Journal Supplement Series. 243, 2, 21 p., 27.

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  • Statistical Stellar Mass Corrections for High-z Galaxies Observed

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DOI

  • L. Bisigello
  • K. I. Caputi
  • L. Colina
  • P. G. Pérez-González
  • A. Koekemoer
  • O. Le Fèvre
  • N. Grogin
  • H. U. Nørgaard-Nielsen
  • P. van der Werf
Stellar masses in future James Webb Space Telescope (JWST) deep blank fields will be mainly derived by fitting the spectral energy distribution (SED) with theoretical galaxy templates. We investigate the uncertainties and biases of the stellar masses derived by using the LePhare code for SED fitting and the Yggdrasil theoretical templates. We consider a sample of mock galaxies at z = 7–10 with mock JWST observations with S/NF150W ≥ 10. Our goal is to provide a list of statistical stellar mass corrections to include on the stellar mass derivation for different output galaxy properties and JWST filter combinations to correct for template degeneracies. Median statistical stellar mass corrections vary from ‑0.83 to 0.87 dex, while 25% (75%) quartiles range from ‑0.83 (‑0.67) to 0.51 (0.88) dex, depending on filter combinations and galaxy models. The most challenging cases are galaxies with nebular emission lines, especially the ones that are wrongly identified as galaxies without, relative dust-free galaxies, and galaxies with small metallicities (i.e., Z = 1/50 Z ⊙). The stellar mass estimation of galaxies correctly identified without emission lines is generally fine, except at z = 10 when considering only the eight NIRCam bands, which make the MIRI bands very valuable. We have tested our stellar mass corrections using the public JAGUAR galaxy catalog, deriving that the average discrepancy in the recovered stellar mass distribution decreases by 20%–50% at z > 7 after the correction. We found that without the stellar mass corrections, the number of low-mass galaxies (M* <107 M ⊙) is overestimated, which can potentially lead to systematic errors in the calculation of the galaxy stellar mass function faint-end slope at high z.
Original languageEnglish
Article number27
Number of pages21
JournalThe Astrophysical Journal Supplement Series
Volume243
Issue number2
Publication statusPublished - 1-Aug-2019

    Keywords

  • galaxies: fundamental parameters, galaxies: high-redshift, galaxies: photometry, STAR-FORMING GALAXIES, METALLICITY RELATION, EVOLUTION, ORIGIN

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