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• W4315434481 abstract "ABSTRACT We study the rest-frame ultraviolet (UV) continuum slopes (β) of galaxies at redshifts 8 &lt; z &lt; 16 (〈z〉 = 10), using a combination of JWST ERO and ERS NIRCam imaging and ground-based near-infrared imaging of the COSMOS field. The combination of JWST and ground-based imaging provides a wide baseline in both redshift and absolute UV magnitude (−22.6 &lt; MUV &lt; −17.9), sufficient to allow a meaningful comparison to previous results at lower redshift. Using a power-law fitting technique, we find that our full sample (median MUV = −19.3 ± 1.3) returns an inverse-variance weighted mean value of 〈β〉 = −2.10 ± 0.05, with a corresponding median value of β = −2.29 ± 0.09. These values imply that the UV colours of galaxies at z &gt; 8 are, on average, no bluer than the bluest galaxies in the local universe (e.g. NGC 1705; β = −2.46). We find evidence for a β − MUV relation, such that brighter UV galaxies display redder UV slopes ($rm {d}beta / rm {d} M_{rm UV} = -0.17 pm 0.05$). Comparing to results at lower redshift, we find that the slope of our β − MUV relation is consistent with the slope observed at z ≃ 5 and that, at a given MUV, our 8 &lt; z &lt; 16 galaxies are bluer than their z ≃ 5 counterparts, with an inverse-variance weighted mean offset of 〈Δβ〉 = −0.38 ± 0.09. We do not find strong evidence that any objects in our sample display ultra-blue UV continuum slopes (i.e. β ≲ −3) that would require their UV emission to be dominated by ultra-young, dust-free stellar populations with high Lyman-continuum escape fractions. Comparing our results to the predictions of theoretical galaxy formation models, we find that the galaxies in our sample are consistent with the young, metal-poor, and moderately dust-reddened galaxies expected at z &gt; 8." @default.
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• W4315434481 date "2023-01-10" @default.
• W4315434481 modified "2023-10-11" @default.
• W4315434481 title "The ultraviolet continuum slopes (<i>β</i>) of galaxies at z ≃ 8-16 from JWST and ground-based near-infrared imaging" @default.
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• W4315434481 doi "https://doi.org/10.1093/mnras/stad073" @default.
• W4315434481 hasPublicationYear "2023" @default.
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