Galaxy formation and evolution

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Bringing Stellar Evolution & Feedback Together: Summary of proposals from the Lorentz Center Workshop, 2022

ArXiv 2301.13611 (2023)

Authors:

Sam Geen, Poojan Agrawal, Paul A Crowther, BW Keller, Alex de Koter, Zsolt Keszthelyi, Freeke van de Voort, Ahmad A Ali, Frank Backs, Lars Bonne, Vittoria Brugaletta, Annelotte Derkink, Sylvia Ekström, Yvonne A Fichtner, Luca Grassitelli, Ylva Götberg, Erin R Higgins, Eva Laplace, Kong You Liow, Marta Lorenzo, Anna F McLeod, Georges Meynet, Megan Newsome, G André Oliva, Varsha Ramachandran, Martin P Rey, Steven Rieder, Emilio Romano-Díaz, Gautham Sabhahit, Andreas AC Sander, Rafia Sarwar, Hanno Stinshoff, Mitchel Stoop, Dorottya Szécsi, Maxime Trebitsch, Jorick S Vink, Ethan Winch
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In-orbit Performance of the Near-Infrared Spectrograph NIRSpec on the James Webb Space Telescope

(2023)

Authors:

T Böker, TL Beck, SM Birkmann, G Giardino, C Keyes, N Kumari, J Muzerolle, T Rawle, P Zeidler, Y Abul-Huda, C Alves de Oliveira, S Arribas, K Bechtold, R Bhatawdekar, N Bonaventura, AJ Bunker, AJ Cameron, S Carniani, S Charlot, M Curti, N Espinoza, P Ferruit, M Franx, P Jakobsen, D Karakla, M López-Caniego, N Lützgendorf, R Maiolino, E Manjavacas, AP Marston, SH Moseley, P Ogle, M Perna, M Peña-Guerrero, N Pirzkal, R Plesha, CR Proffitt, BJ Rauscher, H-W Rix, B Rodríguez del Pino, Z Rustamkulov, E Sabbi, DK Sing, M Sirianni, M te Plate, L Úbeda, GM Wahlgren, E Wislowski, R Wu, CJ Willott
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The ultraviolet continuum slopes (β) of galaxies at z ≃ 8-16 from JWST and ground-based near-infrared imaging

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 520:1 (2023) 14-23

Authors:

Fergus Cullen, RJ McLure, DJ McLeod, JS Dunlop, CT Donnan, AC Carnall, RAA Bowler, R Begley, ML Hamadouche, TM Stanton
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Black hole discs and spheres in galactic nuclei – exploring the landscape of vector resonant relaxation equilibria

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 520:2 (2023) 2204-2216

Authors:

Gergely Máthé, Ákos Szölgyén, Bence Kocsis

Abstract:

ABSTRACT Vector resonant relaxation (VRR) is known to be the fastest gravitational process that shapes the geometry of stellar orbits in nuclear star clusters. This leads to the realignment of the orbital planes on the corresponding VRR time-scale tVRR of a few million years, while the eccentricity e and semimajor axis a of the individual orbits are approximately conserved. The distribution of orbital inclinations reaches an internal equilibrium characterized by two conserved quantities, the total potential energy among stellar orbits, Etot, and the total angular momentum, Ltot. On time-scales longer than tVRR, the eccentricities and semimajor axes change slowly, and the distribution of orbital inclinations are expected to evolve through a series of VRR equilibria. Using a Monte Carlo Markov Chain method, we determine the equilibrium distribution of orbital inclinations in the microcanonical ensemble with fixed Etot and Ltot for isolated nuclear star clusters with a power-law distribution of a, e, and m, where m is the stellar mass. We explore the possible equilibria for nine representative Etot–Ltot pairs that cover the possible parameter space. For all cases, the equilibria show anisotropic mass segregation, where the distribution of more massive objects is more flattened than that for lighter objects. Given that stellar black holes are more massive than the average main-sequence stars, these findings suggest that black holes reside in disc-like structures within nuclear star clusters for a wide range of initial conditions.
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JEMS: A deep medium-band imaging survey in the Hubble Ultra-Deep Field with JWST NIRCam & NIRISS

(2023)

Authors:

Christina C Williams, Sandro Tacchella, Michael V Maseda, Brant E Robertson, Benjamin D Johnson, Chris J Willott, Daniel J Eisenstein, Christopher NA Willmer, Zhiyuan Ji, Kevin N Hainline, Jakob M Helton, Stacey Alberts, Stefi Baum, Rachana Bhatawdekar, Kristan Boyett, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, Anna de Graaf, Eiichi Egami, Marijn Franx, Nimisha Kumari, Roberto Maiolino, Erica J Nelson, Marcia J Rieke, Lester Sandles, Irene Shivaei, Charlotte Simmonds, Renske Smit, Katherine A Suess, Fengwu Sun, Hannah Ubler, Joris Witstok
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