MIGHTEE: the nature of the radio-loud AGN population-Reference-Cited by-同舟云学术

MIGHTEE: the nature of the radio-loud AGN population

Published:2022-08-01 Issue:1 Volume:516 Page:245-263
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Whittam I H¹²^ORCID,Jarvis M J¹²^ORCID,Hale C L³^ORCID,Prescott M²⁴^ORCID,Morabito L K⁵⁶^ORCID,Heywood I¹⁷^ORCID,Adams N J⁸^ORCID,Afonso J⁹¹⁰^ORCID,An Fangxia⁴,Ao Y¹¹¹²,Bowler R A A⁸^ORCID,Collier J D¹³¹⁴¹⁵,Deane R P¹⁶¹⁷^ORCID,Delhaize J¹⁸^ORCID,Frank B¹³¹⁸¹⁹,Glowacki M⁴²⁰,Hatfield P W¹^ORCID,Maddox N²¹^ORCID,Marchetti L¹⁸²²^ORCID,Matthews A M²³,Prandoni I²²^ORCID,Randriamampandry S²⁴²⁵²⁶^ORCID,Randriamanakoto Z²⁴²⁶^ORCID,Smith D J B²⁷^ORCID,Taylor A R²¹³¹⁸,Thomas N L⁵⁶^ORCID,Vaccari M⁴¹³²²^ORCID

Affiliation:

1. Astrophysics, University of Oxford , Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

2. Department of Physics and Astronomy, University of the Western Cape , Robert Sobukwe Road, Bellville 7535, South Africa

3. School of Physics and Astronomy, Institute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK

4. Inter-University Institute for Data Astronomy, University of the Western Cape , Robert Sobukwe Road, Bellville 7535, South Africa

5. Centre for Extragalactic Astronomy, Department of Physics, Durham University , Durham DH1 3LE, UK

6. Institute for Computational Cosmology, Department of Physics, Durham University , Durham DH1 3LE, UK

7. Department of Physics and Electronics, Rhodes University , PO Box 94, Grahamstown 6140, South Africa

8. Jodrell Bank Centre for Astrophysics, University of Manchester , Oxford Road, Manchester M13 9PL, UK

9. Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa , OAL, Tapada da Ajuda, P-1349-018 Lisboa, Portugal

10. Departamento de Física, Faculdade de Ciências, Universidade de Lisboa , Edifício C8, Campo Grande, P-1749-016 Lisbon, Portugal

11. Purple Mountain Observatory and Key Laboratory for Radio Astronomy, Chinese Academy of Sciences , 2 West Beijing Road, Nanjing 210008, China

12. School of Astronomy and Space Science, University of Science and Technology of China , Hefei, Anhui, 230026, China

13. The Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South Africa

14. School of Science, Western Sydney University , Locked Bag 1797, Penrith NSW 2751, Australia

15. CSIRO Astronomy and Space Science , PO Box 1130, Bentley WA 6102, Australia

16. Wits Centre for Astrophysics, School of Physics, University of the Witwatersrand , 1 Jan Smuts Avenue, Johannesburg 2000, South Africa

17. Department of Physics, University of Pretoria , Hatfield, Pretoria 0028, South Africa

18. Department of Astronomy, University of Cape Town , Private Bag X3, Rondebosch 7701, South Africa

19. South African Radio Astronomy Observatory , 2 Fir Street, Observatory 7925, South Africa

20. International Centre for Radio Astronomy Research, Curtin University , Bentley WA 6102, Australia

21. University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr 1, D-81679 Munich, Germany

22. INAF - Istituto di Radioastronomia , via Gobetti 101, I-40129 Bologna, Italy

23. The Observatories of the Carnegie Institution for Science , 813 Santa Barbara Street, Pasadena, CA 91101, USA

24. South African Astronomical Observatory , P.O. Box 9, Observatory 7935, South Africa

25. Southern African Large Telescope , P.O. Box 9, Observatory 7935, Cape Town, South Africa

26. Department of Physics, University of Antananarivo , P.O. Box 906, Antananarivo, 101, Madagascar

27. Centre for Astrophysics Research, University of Hertfordshire , College Lane, Hatfield AL10 9AB, UK

Abstract

ABSTRACT We study the nature of the faint radio source population detected in the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Early Science data in the COSMOS field, focusing on the properties of the radio-loud active galactic nuclei (AGNs). Using the extensive multiwavelength data available in the field, we are able to classify 88 per cent of the 5223 radio sources in the field with host galaxy identifications as AGNs (35 per cent) or star-forming galaxies (54 per cent). We select a sample of radio-loud AGNs with redshifts out to z ∼ 6 and radio luminosities 1020 < L1.4 GHz/W Hz−1 < 1027 and classify them as high-excitation and low-excitation radio galaxies (HERGs and LERGs). The classification catalogue is released with this work. We find no significant difference in the host galaxy properties of the HERGs and LERGs in our sample. In contrast to previous work, we find that the HERGs and LERGs have very similar Eddington-scaled accretion rates; in particular we identify a population of very slowly accreting AGNs that are formally classified as HERGs at these low radio luminosities, where separating into HERGs and LERGs possibly becomes redundant. We investigate how black hole mass affects jet power, and find that a black hole mass ≳ 107.8 M⊙ is required to power a jet with mechanical power greater than the radiative luminosity of the AGN (Lmech/Lbol > 1). We discuss that both a high black hole mass and black hole spin may be necessary to launch and sustain a dominant radio jet.

Funder

National Research Foundation

University of Cape Town

University of the Western Cape

Cape Peninsula University of Technology

University of Pretoria

UCT

ESO

CEA

National Research Council

NRC

Institut National des Sciences de l'Univers, Centre National de la Recherche Scientifique