The BlueTides Mock Image Catalogue: Simulated observations of high-redshift galaxies and predictions for JWST imaging surveys

Marshall, Madeline A.; Watts, Katelyn; Wilkins, Stephen; Di Matteo, Tiziana; Kuusisto, Jussi K.; Roper, William J.; Vijayan, Aswin P.; Ni, Yueying; Feng, Yu; Croft, Rupert A. C.

doi:10.48550/arxiv.2206.08941

Cited by 2 publications

(2 citation statements)

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“…To conduct this, we insert galaxies with a Sérsic index of 1 and M 𝑈 𝑉 luminosities ranging from -19 to -24 into the F200W image used for our selection. Half light radii of the fake sources are of different sizes, which are designed to match the theoretical predicted sizes of distant galaxies from BlueTides (Feng et al 2016;Wilkins et al 2017;Marshall et al 2022). The simulation was carried out by sweeping the magnitude range in 0.2 mag intervals, placing 1000 galaxies in the SMACS 0723 parallel field for each interval, and then running SExtractor in the same way on this field as we did for our original detection.…”

Section: Completeness Analysismentioning

confidence: 99%

Discovery and properties of ultra-high redshift galaxies ($9

Adams¹,

Conselice²,

Ferreira³

et al. 2022

Preprint

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We present a reduction and analysis of the James Webb Space Telescope (JWST) SMACS 0723 field to conduct a search for ultra-high-redshift galaxies (9 < 𝑧 < 12) present within the Epoch of Reionization. We use a combination of photometric redshifts and spectral energy distribution (SED) modelling-based selection criteria to optimise sample completeness while minimising contamination. We find four 𝑧 > 9 candidate galaxies which have not previously been identified, with one object at 𝑧 = 11.5, and another which is possibly a close pair of galaxies. These sources are fairly bright with 𝑚 277 ∼ 26 − 28. A significant fraction of these sources show evidence for Balmer-breaks or extreme emission lines from H𝛽 and [OIII], demonstrating that the stellar populations could be quite advanced in age or very young depending on the exact cause of the F444W excess. We discuss the stellar masses and resolved structures of these early galaxies and find that the Sérsic indices reveal a mixture of light concentration levels, but that the sizes of all our systems are exceptionally small in general with < 0.5 kpc. These systems have stellar masses M * ∼ 10 9.5 M with our 𝑧 ∼ 11.5 candidate a dwarf galaxy with a stellar mass M * ∼ 10 7.9 M These candidate ultra high-redshift galaxies are excellent targets for future NIRSpec observations to understand better their physical nature.

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Section: Completeness Analysismentioning

confidence: 99%

Discovery and properties of ultra-high redshift galaxies ($9

Adams¹,

Conselice²,

Ferreira³

et al. 2022

Preprint

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show abstract

“…Beyond integrated photometry/spectroscopy it is now also possible to produce synthetic imaging (e.g. Trayford et al 2015;Snyder et al 2015;Ma et al 2018;Roper et al 2022;Marshall et al 2022), enabling self-consistent comparisons of morphological metrics. Forward modelling has been applied to models covering a wide range of scales, from high-resolution simulations of individual halos (e.g.…”

mentioning

confidence: 99%

First Light And Reionisation Epoch Simulations (FLARES) VI: The colour evolution of galaxies $z=5-15$

Wilkins¹,

Vijayan²,

Lovell³

et al. 2022

Preprint

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With its exquisite sensitivity, wavelength coverage, and spatial and spectral resolution, the James Webb Space Telescope (JWST) is poised to revolutionise our view of the distant, high-redshift (z > 5) Universe. While Webb's spectroscopic observations will be transformative for the field, photometric observations play a key role in identifying distant objects and providing more comprehensive samples than accessible to spectroscopy alone. In addition to identifying objects, photometric observations can also be used to infer physical properties and thus be used to constrain galaxy formation models. However, inferred physical properties from broadband photometric observations, particularly in the absence of spectroscopic redshifts, often have large uncertainties. With the development of new tools for forward modelling simulations it is now routinely possible to predict observational quantities, enabling a direct comparison with observations. With this in mind, in this work, we make predictions for the colour evolution of galaxies at z = 5 − 15 using the First Light And Reionisation Epoch Simulations (FLARES) cosmological hydrodynamical simulation suite. We predict a complex evolution, driven predominantly by strong nebular line emission passing through individual bands. These predictions are in good agreement with existing constraints from Hubble and Spitzer as well as some of the first results from Webb. We also contrast our predictions with other models in the literature: while the general trends are similar we find key differences, particularly in the strength of features associated with strong nebular line emission. This suggests photometric observations alone should provide useful discriminating power between different models.

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The BlueTides Mock Image Catalogue: Simulated observations of high-redshift galaxies and predictions for JWST imaging surveys

Cited by 2 publications

References 70 publications

Discovery and properties of ultra-high redshift galaxies ($9

Discovery and properties of ultra-high redshift galaxies ($9

First Light And Reionisation Epoch Simulations (FLARES) VI: The colour evolution of galaxies $z=5-15$

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