Narrow line AGN selection in CEERS: spectroscopic selection, physical properties, X-ray and radio analysis

Understand

In this work, we spectroscopically select narrow-line AGNs (NLAGNs) among the ~300 publicly available medium-resolution spectra of the Cosmic Evolution Early Release Science Survey (CEERS).

• Using both traditional and newly identified emission line NLAGN diagnostics diagrams, we identified 52 NLAGNs at 2<z<9, on which we performed a detailed multiwavelength analysis.
• We also identified four new z<2 broad-line AGNs (BLAGNs), in addition to the eight previously reported z>4.5 BLAGNs.
• We found that most of the high-z NLAGN were selected using the recently proposed AGN diagnostic diagrams based on the [Oiii] $\lambda$4363 auroral line or high-ionization emission lines.