Galaxy formation and evolution

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A novel Bayesian approach for decomposing the radio emission of quasars: I. Modelling the radio excess in red quasars

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:4 (2024) 3939-3957

Authors:

B-H Yue, PN Best, KJ Duncan, G Calistro-Rivera, LK Morabito, JW Petley, I Prandoni, HJA Röttgering, DJB Smith

Abstract:

ABSTRACT Studies show that both radio jets from the active galactic nuclei (AGNs) and the star formation (SF) activity in quasar host galaxies contribute to the quasar radio emission; yet their relative contributions across the population remain unclear. Here, we present an improved parametric model that allows us to statistically separate the SF and AGN components in observed quasar radio flux density distributions, and investigate how their relative contributions evolve with AGN bolometric luminosity ($L_\mathrm{bol}$) and redshift (z) using a fully Bayesian method. Based on the newest data from LOw-Frequency ARray Two-metre Sky Survey data release 2, our model gives robust fitting results out to $z\sim 4$, showing a quasar host galaxy SF rate (SFR) evolution that increases with bolometric luminosity and with redshift out to $z\sim 4$. This differs from the global cosmic SFR density, perhaps due to the importance of galaxy mergers. The prevalence of radio AGN emissions increases with quasar luminosity, but has little dependence on redshift. Furthermore, our new methodology and large sample size allow us to subdivide our data set to investigate the role of other parameters. Specifically, in this paper, we explore quasar colour and demonstrate that the radio excess in red quasars is due to an enhancement in AGN-related emission, since the host galaxy SF contribution to the total radio emission is independent of quasar colour. We also find evidence that this radio enhancement occurs mostly in quasars with weak or intermediate radio power.
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MaNGA DynPop – VI. Matter density slopes from dynamical models of 6000 galaxies versus cosmological simulations: the interplay between baryonic and dark matter

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:4 (2024) 4633-4649

Authors:

Shubo Li, Ran Li, Kai Zhu, Shengdong Lu, Michele Cappellari, Shude Mao, Chunxiang Wang, Liang Gao
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Metal-poor star formation at z > 6 with JWST: new insight into hard radiation fields and nitrogen enrichment on 20 pc scales

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:4 (2024) 3301-3322

Authors:

Michael W Topping, Daniel P Stark, Peter Senchyna, Adele Plat, Adi Zitrin, Ryan Endsley, Stéphane Charlot, Lukas J Furtak, Michael V Maseda, Renske Smit, Ramesh Mainali, Jacopo Chevallard, Stephen Molyneux, Jane R Rigby
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The UV continuum slopes of early star-forming galaxies in JADES

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 529:4 (2024) 4087-4103

Authors:

Michael W Topping, Daniel P Stark, Ryan Endsley, Lily Whitler, Kevin Hainline, Benjamin D Johnson, Brant Robertson, Sandro Tacchella, Zuyi Chen, Stacey Alberts, William M Baker, Andrew J Bunker, Stefano Carniani, Stephane Charlot, Jacopo Chevallard, Emma Curtis-Lake, Christa DeCoursey, Eiichi Egami, Daniel J Eisenstein, Zhiyuan Ji, Roberto Maiolino, Christina C Williams, Christopher NA Willmer, Chris Willott, Joris Witstok
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No evidence of AGN features in the nuclei of Arp 220 from JWST/NIRSpec IFS

(2024)

Authors:

Michele Perna, Santiago Arribas, Isabella Lamperti, Miguel Pereira-Santaella, Lorenzo Ulivi, Torsten Böker, Roberto Maiolino, Andrew J Bunker, Stéphane Charlot, Giovanni Cresci, Bruno Rodríguez Del Pino, Francesco D'Eugenio, Hannah Übler, Katja Fahrion, Matteo Ceci
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