Galaxy formation and evolution

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Peeling Back the Layers of Extinction of Dusty Galaxies in the Era of JWST: Modelling Joint NIRSpec + MIRI Spectra at rest-frame 1.5-28 $\mu$m

(2024)

Authors:

FR Donnan, I García-Bernete, D Rigopoulou, M Pereira-Santaella, PF Roche, A Alonso-Herrero
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syren-halofit: A fast, interpretable, high-precision formula for the $\Lambda$CDM nonlinear matter power spectrum

(2024)

Authors:

Deaglan J Bartlett, Benjamin D Wandelt, Matteo Zennaro, Pedro G Ferreira, Harry Desmond
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The Weird and the Wonderful in Our Solar System: Searching for Serendipity in the Legacy Survey of Space and Time

The Astronomical Journal, 167:118 (14pp), 2024 March

Authors:

Brian Rogers, Chris J. Lintott, Steve Croft, Megan E. Schwamb , and James R. A. Davenport

Abstract:

We present a novel method for anomaly detection in solar system object data in preparation for the Legacy Survey of Space and Time. We train a deep autoencoder for anomaly detection and use the learned latent space to search for other interesting objects. We demonstrate the efficacy of the autoencoder approach by finding interesting examples, such as interstellar objects, and show that by using the autoencoder, further examples of interesting classes can be found. We also investigate the limits of classic unsupervised approaches to anomaly detection through the generation of synthetic anomalies and evaluate the feasibility of using a supervised learning approach. Future work should consider expanding the feature space to increase the variety of anomalies that can be uncovered during the survey using an autoencoder.
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A new census of dust and polycyclic aromatic hydrocarbons at z=0.7-2 with JWST MIRI

(2024)

Authors:

Irene Shivaei, Stacey Alberts, Michael Florian, George Rieke, Stijn Wuyts, Sarah Bodansky, Andrew J Bunker, Alex J Cameron, Mirko Curti, Francesco D'Eugenio, Ugne Dudzeviciute, Ivan Kramarenko, Zhiyuan Ji, Benjamin D Johnson, Jianwei Lyu, Jorryt Matthee, Jane Morrison, Rohan Naidu, Naveen Reddy, Brant Robertson, Pablo G Pérez-González, Yang Sun, Sandro Tacchella, Katherine Whitaker, Christina C Williams, Christopher NA Willmer, Joris Witstok, Mengyuan Xiao, Yongda Zhu
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GA-NIFS: JWST/NIRSpec integral field unit observations of HFLS3 reveal a dense galaxy group at z ∼6.3

Astronomy & Astrophysics EDP Sciences 682 (2024) A122

Authors:

Gareth C Jones, Hannah Übler, Michele Perna, Santiago Arribas, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Roberto Maiolino, Bruno Rodríguez Del Pino, Chris Willott, Rebecca AA Bowler, Torsten Böker, Alex J Cameron, Jacopo Chevallard, Giovanni Cresci, Mirko Curti, Francesco D’Eugenio, Nimisha Kumari, Aayush Saxena, Jan Scholtz, Giacomo Venturi, Joris Witstok

Abstract:

Massive, starbursting galaxies in the early Universe represent some of the most extreme objects in the study of galaxy evolution. One such source is HFLS3 (z ∼ 6.34), which was originally identified as an extreme starburst galaxy with mild gravitational magnification (μ ∼ 2.2). Here, we present new observations of HFLS3 with the JWST/NIRSpec integral field unit in both low (PRISM/CLEAR; R ∼ 100) and high spectral resolution (G395H/290LP; R ∼ 2700), with high spatial resolution (∼0.1″) and sensitivity. Using a combination of the NIRSpec data and a new lensing model with accurate spectroscopic redshifts, we find that the 3″ × 3″ field is crowded, with a lensed arc (C, z = 6.3425 ± 0.0002), two galaxies to the south (S1 and S2, z = 6.3592 ± 0.0001), two galaxies to the west (W1, z = 6.3550 ± 0.0001; W2, z = 6.3628 ± 0.0001), and two low-redshift interlopers (G1, z = 3.4806 ± 0.0001; G2, z = 2.00 ± 0.01). We present spectral fits and morpho-kinematic maps for each bright emission line (e.g. [OIII]λ5007, Hα, and [NII]λ6584) from the R2700 data for all sources except G2 (whose spectral lines fall outside the observed wavelengths of the R2700 data). From a line ratio analysis, we find that the galaxies in component C are likely powered by star formation, though we cannot rule out or confirm the presence of active galactic nuclei in the other high-redshift sources. We performed gravitational lens modelling, finding evidence for a two-source composition of the lensed central object and a magnification factor (μ = 2.1 − 2.4) comparable to findings of previous work. The projected distances and velocity offsets of each galaxy suggest that they will merge within the next ∼1 Gyr. Finally, we examined the dust extinction-corrected SFRHα of each z > 6 source, finding that the total star formation (510 ± 140 M⊙ yr−1, magnification-corrected) is distributed across the six z ∼ 6.34 − 6.36 objects over a region of diameter ∼11 kpc. Altogether, this suggests that HFLS3 is not a single starburst galaxy, but instead a merging system of star-forming galaxies in the epoch of reionisation.
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