Galaxy formation and evolution

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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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Evolution of the disky second generation of stars in globular clusters on cosmological timescale

(2024)

Authors:

Peter Berczik, Taras Panamarev, Maryna Ishchenko, Bence Kocsis
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The ALMA-CRISTAL Survey: Spatially Resolved Star Formation Activity and Dust Content in 4 < z < 6 Star-forming Galaxies

The Astrophysical Journal American Astronomical Society 976:1 (2024) 70

Authors:

Juno Li, Elisabete Da Cunha, Jorge González-López, Manuel Aravena, Ilse De Looze, NM Förster Schreiber, Rodrigo Herrera-Camus, Justin Spilker, Ken-ichi Tadaki, Loreto Barcos-Munoz, Andrew J Battisti, Jack E Birkin, Rebecca AA Bowler, Rebecca Davies, Tanio Díaz-Santos, Andrea Ferrara, Deanne B Fisher, Jacqueline Hodge, Ryota Ikeda, Meghana Killi, Lilian Lee, Daizhong Liu, Dieter Lutz, Ikki Mitsuhashi, Thorsten Naab, Ana Posses, Monica Relaño, Manuel Solimano, Hannah Übler, Stefan Anthony van der Giessen, Vicente Villanueva
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A 260 pc resolution ALMA map of HCN(1–0) in the galaxy NGC 4321

Astronomy & Astrophysics EDP Sciences 691 (2024) a121

Authors:

Lukas Neumann, Frank Bigiel, Ashley T Barnes, Molly J Gallagher, Adam Leroy, Antonio Usero, Erik Rosolowsky, Ivana Bešlić, Médéric Boquien, Yixian Cao, Mélanie Chevance, Dario Colombo, Daniel A Dale, Cosima Eibensteiner, Kathryn Grasha, Jonathan D Henshaw, María J Jiménez-Donaire, Sharon Meidt, Shyam H Menon, Eric J Murphy, Hsi-An Pan, Miguel Querejeta, Toshiki Saito, Eva Schinnerer, Sophia K Stuber, Yu-Hsuan Teng, Thomas G Williams
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Dynamical resonances in PHANGS galaxies

Astronomy & Astrophysics EDP Sciences 691 (2024) a351

Authors:

Marina Ruiz-García, Miguel Querejeta, Santiago García-Burillo, Eric Emsellem, Sharon E Meidt, Mattia C Sormani, Eva Schinnerer, Thomas G Williams, Zein Bazzi, Dario Colombo, Damian R Gleis, Oleg Y Gnedin, Ralf S Klessen, Adam K Leroy, Patricia Sánchez-Blázquez, Sophia K Stuber
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