CL Hale
MIGHTEE: deep 1.4 GHz source counts and the sky temperature contribution of star-forming galaxies and active galactic nuclei
Hale, CL; Whittam, IH; Jarvis, MJ; Best, PN; Thomas, NL; Heywood, I; Prescott, M; Adams, N; Afonso, J; An, Fangxia; Bowler, RAA; Collier, JD; Cook, RHW; Davé, R; Frank, BS; Glowacki, M; Hatfield, PW; Kolwa, S; Lovell, CC; Maddox, N; Marchetti, L; Morabito, LK; Murphy, E; Prandoni, I; Randriamanakoto, Z; Taylor, AR
Authors
IH Whittam
MJ Jarvis
PN Best
Nicole Thomas nicole.l.thomas@durham.ac.uk
Academic Visitor
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
Dr Leah Morabito leah.k.morabito@durham.ac.uk
Associate Professor
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 survey down to S1.4GHz ∼15 μ Jy. 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 characterization, clustering, and variations in the assumed source model used to simulate sources within the field and characterize 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 μ Jy.
Citation
Hale, C., Whittam, I., Jarvis, M., Best, P., Thomas, N., Heywood, I., …Taylor, A. (2023). 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, 520(2), 2668 - 2691. https://doi.org/10.1093/mnras/stac3320
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 8, 2022 |
Online Publication Date | Nov 18, 2022 |
Publication Date | 2023-04 |
Deposit Date | May 11, 2023 |
Publicly Available Date | Mar 29, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 520 |
Issue | 2 |
Pages | 2668 - 2691 |
DOI | https://doi.org/10.1093/mnras/stac3320 |
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http://creativecommons.org/licenses/by/4.0/
Copyright Statement
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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