JWST’s PEARLS: TN J1338–1942 – I. Extreme jet-triggered star formation in a z  = 4.11 luminous radio galaxy

Author:

Duncan Kenneth J1ORCID,Windhorst Rogier A2,Koekemoer Anton M3ORCID,Röttgering Huub J A4,Cohen Seth H2,Jansen Rolf A2,Summers Jake2,Tompkins Scott2ORCID,Hutchison Taylor A5,Conselice Christopher J6,Driver Simon P7ORCID,Yan Haojing8,Adams Nathan J6ORCID,Cheng Cheng9,Coe Dan31011,Diego Jose M12ORCID,Dole Hervé13,Frye Brenda14,Gim Hansung B15,Grogin Norman A3,Holwerda Benne W16ORCID,Lim Jeremy17,Marshall Madeline A1819ORCID,Nonino Mario20,Pirzkal Nor3,Robotham Aaron7ORCID,Ryan Russell E3,Willmer Christopher N A14

Affiliation:

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

2. School of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287-1404, USA

3. Space Telescope Science Institute , 3700 San Martin Drive , Baltimore, MD 21218, USA

4. Leiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden, the Netherlands

5. Astrophysics Science Division, NASA Goddard Space Flight Center , 8800 Greenbelt Rd , Greenbelt, MD 20771, USA

6. Jodrell Bank Centre for Astrophysics, Alan Turing Building, University of Manchester , Oxford Road , Manchester M13 9PL, UK

7. International Center for Radio Astronomy Research (ICRAR) and the International Space Center (ISC), The University of Western Australia , M468 35 Stirling Highway , Crawley, WA 6009, Australia

8. Department of Physics and Astronomy, University of Missouri , Columbia, MO 65211, USA

9. Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS , Beijing 100101, Peopleʼs Republic of China

10. Association of Universities for Research in Astronomy (AURA) for the European Space Agency (ESA), STScI , Baltimore, MD 21218, USA

11. Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University , 3400 N Charles St , Baltimore, MD 21218, USA

12. Instituto de Física de Cantabria (CSIC-UC) , Avenida. Los Castros s/n, E-39005 Santander, Spain

13. Université Paris-Saclay, CNRS, Institut d’Astrophysique Spatiale , F-91405 Orsay, France

14. Steward Observatory, University of Arizona , 933 N Cherry Ave , Tucson, AZ 85721-0009, USA

15. Department of Physics, Montana State University , P. O. Box 173840, Bozeman, MT 59717, USA

16. Department of Physics and Astronomy, University of Louisville , Louisville, KY 40292, USA

17. Department of Physics, The University of Hong Kong , Pokfulam Road , Hong Kong

18. National Research Council of Canada, Herzberg Astronomy and Astrophysics Research center , 5071 West Saanich Road , Victoria, BC V9E 2E7, Canada

19. ARC center of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Australia

20. INAF-Osservatorio Astronomico di Trieste , Via Bazzoni 2, I-34124 Trieste, Italy

Abstract

ABSTRACT We present the first JWST observations of the z  = 4.11 luminous radio galaxy TN J1338–1942, obtained as part of the ‘Prime Extragalactic Areas for Reionization and Lensing Science’ (‘PEARLS’) project. Our NIRCam observations, designed to probe the key rest-frame optical continuum and emission line features at this redshift, enable resolved spectral energy distribution modelling that incorporates both a range of stellar population assumptions and radiative shock models. With an estimated stellar mass of log10(M/M⊙) ∼ 10.9, TN J1338–1942 is confirmed to be one of the most massive galaxies known at this epoch. Our observations also reveal extremely high equivalent-width nebular emission coincident with the luminous AGN jets that is best fit by radiative shocks surrounded by extensive recent star formation. We estimate the total star-formation rate (SFR) could be as high as $\sim 1600\, \text{M}_{\odot }\, \text{yr}^{-1}$ , with the SFR that we attribute to the jet induced burst conservatively $\gtrsim 500\, \text{M}_{\odot }\, \text{yr}^{-1}$ . The mass-weighted age of the star-formation, tmass < 4 Myr, is consistent with the likely age of the jets responsible for the triggered activity and significantly younger than that measured in the core of the host galaxy. The extreme scale of the potential jet-triggered star-formation activity indicates the potential importance of positive AGN feedback in the earliest stages of massive galaxy formation, with our observations also illustrating the extraordinary prospects for detailed studies of high-redshift galaxies with JWST.

Funder

European Union

STFC

NASA

European Research Council

Australian Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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