Evidence for non-merger co-evolution of galaxies and their supermassive black holes



Rj Smethurst, Rs Beckmann, Bd Simmons, A Coil, J Devriendt, Y Dubois, Il Garland, Cj Lintott, G Martin, S Peirani

MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star forming galaxies and active galactic nuclei

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2022)


CL Hale, IH Whittam, MJ Jarvis, PN Best, NL Thomas, I Heywood, M Prescott, N Adams, J Afonso, Fangxia An, RAA Bowler, JD Collier, RHW Cook, R Davé, BS Frank, M Glowacki, PW Hatfield, S Kolwa, CC Lovell, N Maddox, L Marchetti, LK Morabito, E Murphy, I Prandoni, Z Randriamanakoto, AR Taylor


Abstract We present deep 1.4 GHz source counts from ∼5 deg2 of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration (MIGHTEE) survey down to S1.4GHz ∼15 μJy. Using observations over two extragalactic fields (COSMOS and XMM-LSS), we provide a comprehensive investigation into correcting the incompleteness of the raw source counts within the survey to understand the true underlying source count population. We use a variety of simulations that account for: errors in source detection and characterisation, clustering, and variations in the assumed source model used to simulate sources within the field and characterise source count incompleteness. We present these deep source count distributions and use them to investigate the contribution of extragalactic sources to the sky background temperature at 1.4 GHz using a relatively large sky area. We then use the wealth of ancillary data covering a subset of the COSMOS field to investigate the specific contributions from both active galactic nuclei (AGN) and star forming galaxies (SFGs) to the source counts and sky background temperature. We find, similar to previous deep studies, that we are unable to reconcile the sky temperature observed by the ARCADE 2 experiment. We show that AGN provide the majority contribution to the sky temperature contribution from radio sources, but the relative contribution of SFGs rises sharply below 1 mJy, reaching an approximate 15-25 per cent contribution to the total sky background temperature (Tb ∼100 mK) at ∼15 μJy.

Finding high-redshift gamma-ray bursts in tandem near-infrared and optical surveys

Nature Astronomy 6:10 (2022) 1101-1104


S Campana, G Ghirlanda, R Salvaterra, OA Gonzalez, M Landoni, G Pariani, A Riva, M Riva, SJ Smartt, NR Tanvir, SD Vergani

Erratum: “The Evolution of NGC 7465 as Revealed by Its Molecular Gas Properties” (2021, ApJ, 909, 98)

The Astrophysical Journal American Astronomical Society 937:1 (2022) 47-47


Lisa M Young, David S Meier, Martin Bureau, Alison Crocker, Timothy A Davis, Selçuk Topal

Kiloparsec view of a typical star-forming galaxy when the Universe was similar to 1 Gyr old II. Regular rotating disk and evidence for baryon dominance on galactic scales



R Herrera-Camus, NM Foerster Schreiber, SH Price, H Ubler, AD Bolatto, RL Davies, D Fisher, R Genzel, D Lutz, T Naab, A Nestor, T Shimizu, A Sternberg, L Tacconi, K Tadaki