To test R_NLRs~-~L_O3 relation for narrow emission line regions of AGN through low redshift Type-2 AGN in SDSS

2024/02/19 by Xueguang Zhang, Zhang, XueGuang
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Gamma-ray bursts and supernovae

paper · pdf · doi:10.48550/arxiv.2402.12063

openalex publication_date 2024/02/19 · openalex created_date 2024/02/21 · openalex updated_date 2026/07/28

Abstract

Sizes of narrow emission line regions (NLRs) of AGN could be estimated by [O~\sc iii] line luminosity L_O3 through the known R_NLRs-L_O3 empirical relations. Unfortunately, it is not convenient to test the R_NLRs-L_O3 empirical relations through structure properties of spatially resolved NLRs of large samples of AGN. In this manuscript, a method is proposed to test the R_NLRs-L_O3^∼0.25 empirical relations for AGN NLRs through SDSS Type-2 AGN having few orientation effects on NLRs sizes expected by AGN unified model, after considering sizes R_fib of SDSS fiber covered regions. Comparing R_fib and R_NLRs estimated by L_O3, Type-2 AGN with R_fib>R_NLRs (Sample-II) and with R_fib

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