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Author

J. Witstok

6 papers indexed here

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Review Oct 2026

Dust at cosmic dawn: unveiling the onset of dust and obscured star formation at $z\gtrsim8$

Although less than 1 percent of the baryonic mass budget of a galaxy, cosmic dust profoundly alters the multi-wavelength appearance of galaxies across cosmic time. The (sub)millimeter wavelength regime is uniquely capable of weighing these dust reservoirs, and revealing the total extent of galaxy evolution that remains...

H. Algera, T. Bakx, M. Aravena et al. · 0 citations
Review Oct 2026

IRAC-Excess Galaxies in the NIRSpec Wide Survey: physical properties of bright EELGs at $z\sim7$ and implications for Reionization

We present an analysis of 23 Spitzer/IRAC excess galaxies at $5.66<z<7.64$, observed as part of the NIRSpec Wide GTO survey. With NIRSpec PRISM spectroscopy, we measure a median rest-frame [OIII]$+\rm{H}\beta$ EW $=1583$~{\AA}, consistent with predictions from the pre-JWST selection and we identify $17/23$ $(\sim74\%)$...

K. Ormerod, R. Smit, J. Witstok et al. · 0 citations
Open access Oct 2025

Mergers lighting the early Universe: modest star-formation enhancement without evidence for AGN or Lyα triggering

Galaxy mergers and interactions are often invoked to explain enhanced star formation, black hole growth, and mass build-up of galaxies at later cosmic times, but their effect is poorly understood at high redshift (z > 2). We use JADES data to analyse a mass-complete sample of 1968 galaxies at z = 3 − 9 with log(M⋆/M⊙...

D. Puskás, S. Tacchella, C. Simmonds et al. · 0 citations
Review Sep 2026

Source--Line Associations in JWST/NIRSpec Dense-Shutter Spectroscopy

We demonstrate the feasibility of source--line association in JWST/NIRSpec dense-shutter spectroscopy, with $\sim$2000 sources observed simultaneously per pointing regardless of spectral overlap. While JWST wide-field slitless spectroscopy (WFSS) can disentangle overlapping spectra using two grisms with perpendicular d...

Zi-Hao Wu, D. Eisenstein, F. D'Eugenio et al. · 0 citations
Preprint Oct 2026

The DAWN JWST Archive: A spectroscopically-informed population study of the physical properties of galaxies at z>2

Charting the evolution of star-formation, stellar mass and dust build-up over cosmic time relies on the accurate characterisation of the stellar population properties of high redshift galaxies. We present a catalogue of spectroscopically derived physical properties for ~12,000 galaxies at z>2, with archival JWST/NIRSpe...

R. Gottumukkala, G. Brammer, S. Toft et al. · 0 citations
Review Open access Sep 2026

JADES: The Star Formation and Dust Reddening Properties of Galaxies at 3 < z < 7

We present the star formation and dust content properties for a sample of 646 galaxies at redshifts 3 < z < 7 as part of the JADES survey. Our analysis is based on measurements of the Hα/Hβ Balmer decrement using medium resolution (R ∼ 1000) spectroscopic observations with the JWST/NIRSpec microshutter assembly. Stella...

Charity Woodrum, I. Shivaei, J. Witstok et al. · 0 citations

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