Role of AGN in galaxy evolution in z~3-11 with Deep JWST spectroscopy

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• Jan Scholtz
• Wednesday 22 May 2024, 13:40-14:05
• The Hoyle Lecture Theatre + Zoom .

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AGN feedback remains a vital path for the quenching of galaxies in theoretical models. With the recent discovery of quiescent galaxies at z>3, identification of typical moderate AGNs at high redshift became more vital than ever, in order to explain the ever-growing population of quiescent galaxies. As typical selection techniques such as X-ray and radio observations are not sensitive enough to detect typical AGN population at high redshifts (z>3), we need to rely on optical emission lines, not accessible to astronomers at these redshifts until the launch of JWST . However, typical selection techniques using optical emission lines (such as BPT diagram), fail to reliably select AGN due to low metallicities of galaxies at high redshift, hence the need to revisit AGN selection. In this talk, I will present the results from the JWST Advanced Galactic Survey (JADES) and its deep NIR Spec/MSA observations of 500 galaxies between z~3-11. I will describe the selection of AGN host galaxies at high-z using these emission lines, to reliably distinguish between star-forming and AGN host galaxies.Using this unique state-of-the-art dataset, I will present the first characterization of moderate luminosity AGN and their host galaxy properties (such as type-1/type-2 fractions, black-hole masses, star-formation rates, stellar mass, etc.) and compare them to AGN in the local Universe and at Cosmic Noon (z=1-3)

This talk is part of the Institute of Astronomy Seminars series.

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• Institute of Astronomy Seminars
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