articleAstronomy and AstrophysicsJul 17, 2023DIAMOND OA

GA-NIFS: A massive black hole in a low-metallicity AGN at z  ∼ 5.55 revealed by JWST/NIRSpec IFS

HÜHannah ÜblerRMR. MaiolinoECEmma Curtis-LakePGPablo G. Pérez‐GonzálezMCMirko Curti

University of Cambridge · ASTRO-3D · +15 more institutions

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Abstract

We present rest-frame optical data of the compact z = 5.55 galaxy GS_3073 obtained using the integral field spectroscopy mode of the Near-InfraRed Spectrograph on board the James Webb Space Telescope. The galaxy’s prominent broad components in several hydrogen and helium lines (though absent in the forbidden lines) and v detection of a large equivalent width of He II λ 4686, EW(He II ) ∼20 Å, unambiguously identify it as an active galactic nucleus (AGN). We measured a gas phase metallicity of Z gas / Z ⊙ ∼0.21 −0.04 +0.08 , which is lower than what has been inferred for both more luminous AGN at a similar redshift and lower redshift AGN. We empirically show that classical emission line ratio diagnostic…

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Topics & keywords

Topics
Keywords
  • Physics
  • Astrophysics
  • Galaxy
  • Redshift
  • Metallicity
  • Active galactic nucleus
  • Astronomy
  • Doubly ionized oxygen
UN Sustainable Development Goals
  • Climate action
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