Galaxy formation and evolution

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A hidden Active Galactic Nuclei population: the first radio luminosity functions constructed by physical process

ArXiv 2411.05069 (2024)

Authors:

Leah K Morabito, R Kondapally, PN Best, B-H Yue, JMGHJ de Jong, F Sweijen, Marco Bondi, Dominik J Schwarz, DJB Smith, RJ van Weeren, HJA Röttgering, TW Shimwell, Isabella Prandoni
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Extreme emission line galaxies detected in JADES JWST/NIRSpec – I. Inferred galaxy properties

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 535:2 (2024) 1796-1828

Authors:

Kit Boyett, Andrew J Bunker, Emma Curtis-Lake, Jacopo Chevallard, Alex J Cameron, Gareth C Jones, Aayush Saxena, Stéphane Charlot, Mirko Curti, Imaan EB Wallace, Santiago Arribas, Stefano Carniani, Chris Willott, Stacey Alberts, Daniel J Eisenstein, Kevin Hainline, Ryan Hausen, Benjamin D Johnson, Marcia Rieke, Brant Robertson, Daniel P Stark, Sandro Tacchella, Christina C Williams, Zuyi Chen, Eiichi Egami, Ryan Endsley, Nimisha Kumari, Isaac Laseter, Tobias J Looser, Michael V Maseda, Jan Scholtz, Irene Shivaei, Charlotte Simmonds, Renske Smit, Hannah Übler, Joris Witstok
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MIGHTEE: The Continuum Survey Data Release 1

(2024)

Authors:

CL Hale, I Heywood, MJ Jarvis, IH Whittam, PN Best, Fangxia An, RAA Bowler, I Harrison, A Matthews, DJB Smith, AR Taylor, M Vaccari
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The GECKOS Survey: identifying kinematic sub-structures in edge-on galaxies

(2024)

Authors:

A Fraser-McKelvie, J van de Sande, Da Gadotti, E Emsellem, T Brown, Db Fisher, M Martig, Martin Bureau, O Gerhard, Aj Battisti, J Bland-Hawthorn, B Catinella, F Combes, L Cortese, Sm Croom, Ta Davis, J Falcón-Barroso, F Fragkoudi, Kc Freeman, Mr Hayden, R McDermid, B Mazzilli Ciraulo, Jt Mendel, F Pinna, Adriano Poci, Th Rutherford, C de Sá-Freitas, La Silva-Lima, Lm Valenzuela, G van de Ven, Z Wang, Ab Watts
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A hidden active galactic nucleus population: the first radio luminosity functions constructed by physical process

Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 536:1 (2024) L32-L37

Authors:

Leah K Morabito, R Kondapally, PN Best, B-H Yue, JMGHJ de Jong, F Sweijen, Marco Bondi, Dominik J Schwarz, DJB Smith, RJ van Weeren, HJA Röttgering, TW Shimwell, Isabella Prandoni

Abstract:

ABSTRACT Both star formation (SF) and active galactic nuclei (AGNs) play an important role in galaxy evolution. Statistically quantifying their relative importance can be done using radio luminosity functions (RLFs). Until now these relied on galaxy classifications, where sources with a mixture of radio emission from SF and AGN are labelled as either a star-forming galaxy or an AGN. This can cause the misestimation of the relevance of AGN. Brightness temperature measurements at 144 MHz with the International LOw Frequency ARray telescope can separate radio emission from AGN and SF. We use the combination of sub-arcsec and arcsec resolution imaging of 7497 sources in the Lockman Hole and ELAIS-N1 fields to identify AGN components in the sub-arcsec resolution images and subtract them from the total flux density, leaving flux density from SF only. We construct, for the first time, RLFs by physical process, either SF or AGN activity, revealing a hidden AGN population at $L_{\textrm {144 MHz}}$$\lt 10^{24}$ W Hz$^{-1}$. This population is 1.56 $\pm$ 0.06 more than expected for $0.5\lt z\lt 2.0$ when comparing to RLFs by galaxy classification. The star-forming population has only 0.90 $\pm$ 0.02 of the expected SF. These ‘hidden’ AGNs can have significant implications for the cosmic SF rate and kinetic luminosity densities.
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