Star Formation and AGN Activity 500 Myr after the Big Bang: Insights from JWST

D’Silva, Jordan C. J.; Driver, Simon P.; Lagos, Claudia D. P.; Robotham, Aaron S. G.; Summers, Jake; Windhorst, Rogier A.

doi:10.3847/2041-8213/ad103e

Cited by 5 publications

(2 citation statements)

References 92 publications

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“…Finally, we note that the contribution from AGN can have a significant influence on the stellar mass estimates (D'Silva et al 2023). In this work, we only model the mid-infrared emission from the AGN, and find that our sample has low AGN contribution.…”

Section: Systematic Uncertainties From Fixed Parameters In Sed Modelingmentioning

confidence: 86%

Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, IMF, and Nebular Physics

Wang 王,

Leja,

Atek

et al. 2024

ApJ

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The era of the James Webb Space Telescope ushers stellar population models into uncharted territories, particularly at the high-redshift frontier. In a companion paper, we apply the Prospector Bayesian framework to jointly infer galaxy redshifts and stellar population properties from broadband photometry as part of the UNCOVER survey. Here we present a comprehensive error budget in spectral energy distribution (SED) modeling. Using a sample selected to have photometric redshifts higher than 9, we quantify the systematic shifts stemming from various model choices in inferred stellar mass, star formation rate (SFR), and age. These choices encompass different timescales for changes in the star formation history (SFH), nonuniversal stellar initial mass functions (IMF), and the inclusion of variable nebular abundances, gas density, and ionizing photon budget. We find that the IMF exerts the strongest influence on the inferred properties: the systematic uncertainties can be as much as 1 dex, 2–5 times larger than the formal reported uncertainties in mass and SFR, and importantly, exceed the scatter seen when using different SED fitting codes. Although the assumptions on the lower end of the IMF induce degeneracy, our findings suggest that a common practice in the literature of assessing uncertainties in SED-fitting processes by comparing multiple codes is substantively underestimating the true systematic uncertainty. Highly stochastic SFHs change the inferred SFH by much larger than the formal uncertainties, and introduce ∼0.8 dex systematics in SFR averaged over a short timescale and ∼0.3 dex systematics in average age. Finally, employing a flexible nebular emission model causes ∼0.2 dex systematic increase in mass and SFR, comparable to the formal uncertainty. This paper constitutes an initial step toward a complete uncertainty estimate in SED modeling.

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Section: Systematic Uncertainties From Fixed Parameters In Sed Modelingmentioning

confidence: 86%

Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, IMF, and Nebular Physics

Wang 王,

Leja,

Atek

et al. 2024

ApJ

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“…• If AGN contribute to the observed UV luminosity, then the measurements can drop by 0.4 dex on average, or up to 4 dex for individual galaxies [28].…”

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confidence: 99%

Are James Webb Space Telescope Observations Consistent with Warm Dark Matter?

Hoeneisen

2024

IJAA

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We compare observed with predicted distributions of galaxy stellar masses * M and galaxy rest-frame ultra-violet luminosities per unit bandwidth UV L , in the redshift range 2 z = to 13. The comparison is presented as a function of the comoving warm dark matter free-streaming cut-off wavenumber fs k .For this comparison the theory is a minimal extension of the Press-Schechter formalism with only two parameters: the star formation efficiency, and a proportionality factor between the star formation rate per galaxy and UV L .These two parameters are fixed to their values obtained prior to the James Webb Space Telescope (JWST) data. The purpose of this comparison is to identify if, and where, detailed astrophysical evolution is needed to account for the new JWST observations.

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Super-early JWST galaxies, outflows, and Lyαvisibility in the Epoch of Reionization

Ferrara

2024

A&A

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The overabundance of super-early (redshift $z>10$) luminous ($M_ UV < -20$) blue galaxies detected by JWST has been explained as being due to negligible dust attenuation in these systems. We show that this model correctly reproduces the UV luminosity function at $z>10$ and the star formation rate (SFR) density evolution. The model also predicts, in agreement with data, that the cosmic specific SFR (sSFR) grows as $ sSFR $. At $z 10$, the cosmic sSFR crosses the critical value $ sSFR^ $, and approximately $45$<!PCT!> of the galaxies become super-Eddington, driving outflows reaching velocities of $ where $ and $f_M$ are the star formation efficiency and fraction of the halo gas expelled in the outflow, respectively. This prediction is consistent with the outflow velocities measured in 12 super-Eddington galaxies of the JWST /JADES sample. Such outflows clear the dust, thus boosting the galaxy luminosity. They also dramatically enhance the visibility of the Lyalpha line from $z>10$ galaxies by introducing a velocity offset. The observed Lyalpha properties in GN-z11 ($z=10.6$) are simultaneously recovered by the outflow model if $ HI 20.1$, implying that the outflow is largely ionized. We make analogous predictions for the Lyalpha visibility of other super-early galaxies, and we compare the model with Lyalpha surveys at $z>7$, finding that essentially all super-Eddington (sub-Eddington) galaxies are (not) detected in Lyalpha . Finally, the sSFR positively correlates with the LyC escape fraction, as outflows carve ionized transparent channels through which LyC photons leak.

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Star Formation and AGN Activity 500 Myr after the Big Bang: Insights from JWST

Cited by 5 publications

References 92 publications

Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, IMF, and Nebular Physics

Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, IMF, and Nebular Physics

Are James Webb Space Telescope Observations Consistent with Warm Dark Matter?

Super-early JWST galaxies, outflows, and Lyαvisibility in the Epoch of Reionization

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