JADES: A large population of obscured, narrow-line active galactic nuclei at high redshift

We present the identification of 41 narrow-line active galactic nuclei (type-2 AGN) candidates in the two deepest observations of the JADES spectroscopic survey with JWST/NIRSpec. The spectral coverage and the depth of our observations allowed us to select narrow-line AGN based on both rest-frame optical and UV emission lines up to z = 10. Due to the metallicity decrease of galaxies, at z > 3, the standard optical diagnostic diagrams (N2-BPT or S2-VO87) become unable to distinguish many AGN from other sources of photoionisation. Therefore, we also used high ionisation lines, such as He II λ 4686, He II λ 1640, [Ne IV ] λ 2422, [Ne V ] λ 3420, and N V λ 1240, also in combination with other UV transitions, to…

• NS
  National Science Foundation

  Awards: AST 1828315, 1828315
• NA
  National Aeronautics and Space Administration

  Award: NAS5-02015
• AS
  American Society for Radiation Oncology
• UO
  University of California, Santa Cruz

  Award: 1828315
• JH
  Johns Hopkins University
• DE
  Dell EMC
• UR
  UK Research and Innovation

  Awards: 101040227, PID2021-127718NB-I00
• EC
  European Commission

  Awards: ST/W001438/1, 789056, 10.13039/501100011033, 13039/501100011033, 501100011033, 695671, EP/T022159/1, 101040227
• IN
  Isaac Newton Trust
• MD
  Ministerio de Ciencia e Innovación

  Awards: AEI/ 10.13039/501100011033, 10.13039, PID2021-127718NB-I00, 501100011033, 10.13039/501100011033, 13039/501100011033, MICIN/AEI/ 10.13039/501100011033
• EA
  Engineering and Physical Sciences Research Council

  Awards: EP/T022159/, EP/T022159/1
• SA
  Science and Technology Facilities Council

  Awards: ST/W001438/1, PID2021-127718NB-I00, ST/V506709/1, NAS5-02015, CE170100013, 695671
• ER
  European Research Council

  Awards: 695671, 789056, 10104227
• AE
  Agencia Estatal de Investigación

  Awards: 501100011033, 10.13039/501100011033, AEI/ 10.13039/501100011033, 13039, 10.13039, 13039/501100011033