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A first look at spatially resolved Balmer decrements at 1.0 < z < 2.4 from JWST NIRISS slitless spectroscopy

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DOIResolve DOI: https://doi.org/10.3847/2041-8213/acd1db
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-7547-3385; Search for: ORCID identifier: https://orcid.org/0000-0002-9330-9108; Search for: ORCID identifier: https://orcid.org/0000-0001-8830-2166; Search for: ORCID identifier: https://orcid.org/0000-0003-2680-005X; Search for: ORCID identifier: https://orcid.org/0000-0002-4542-921X; Search for: ORCID identifier: https://orcid.org/0000-0003-3983-5438; Search for: ORCID identifier: https://orcid.org/0000-0001-5984-0395; Search for: ORCID identifier: https://orcid.org/0000-0001-8325-1742; Search for: 1ORCID identifier: https://orcid.org/0000-0003-3243-9969; Search for: ORCID identifier: https://orcid.org/0000-0002-8530-9765; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-7712-7857; Search for: ORCID identifier: https://orcid.org/0000-0002-6338-7295; Search for: 1ORCID identifier: https://orcid.org/0000-0002-4201-7367; Search for: ORCID identifier: https://orcid.org/0000-0003-4196-5960; Search for: 1ORCID identifier: https://orcid.org/0009-0006-4881-3299; Search for: ORCID identifier: https://orcid.org/0000-0001-9414-6382
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: Canadian Space Agency; Search for: Slovenian National Research Agency; Search for: Space Telescope Science Institute
FormatText, Article
Subjecthigh-redshift galaxies; galaxy evolution; star formation; galaxy stellar content
Abstract
We present the first results on the spatial distribution of dust attenuation at 1.0 < z < 2.4 traced by the Balmer decrement, Hα/Hβ, in emission-line galaxies using deep JWST NIRISS slitless spectroscopy from the CAnadian NIRISS Unbiased Cluster Survey (CANUCS). Hα and Hβ emission-line maps of emission-line galaxies are extracted and stacked in bins of stellar mass for two grism redshift bins, 1.0 < zgrism < 1.7 and 1.7 < zgrism < 2.4. Surface brightness profiles for the Balmer decrement are measured and radial profiles of the dust attenuation toward Hα, AHα, are derived. In both redshift bins, the integrated Balmer decrement increases with stellar mass. Lower-mass (7.6 „ Log(M*/Me) < 10.0) galaxies have centrally concentrated, negative dust attenuation profiles whereas higher-mass galaxies (10.0 „ Log(M*/Me) < 11.1) have flat dust attenuation profiles. The total dust obscuration is mild, with on average 0.07 ± 0.07 and 0.14 ± 0.07 mag in the low- and high-redshift bins respectively. We model the typical light profiles of star-forming galaxies at these redshifts and stellar masses with GALFIT and apply both uniform and radially varying dust attenuation corrections based on our integrated Balmer decrements and radial dust attenuation profiles. If the Hα star formation rates (SFRs) of these galaxies were measured after slit-loss corrections assuming uniform dust attenuation with typical JWST NIRSpec slit spectroscopy (0 2 × 0 5 shutters), the total SFR will be overestimated by 6% ± 21% and 26% ± 9% at 1.0 „ z < 1.7 and 1.7 „ z < 2.4 respectively.
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PublisherIOP
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  • The Astrophysical Journal Letters 949, no. 1 (22 May 2023): 1–7.
LanguageEnglish
Peer reviewedYes
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Record identifierb162d1c5-e678-4988-a688-41fab9c0dd49
Record created2023-07-17
Record modified2023-07-17
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