In this work, we revisit the size-luminosity relation of the extended narrow line regions (ENLRs) using a large sample of nearby active galactic nuclei (AGN) from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The ENLRs ionized by the AGN are identified through the spatially resolved BPT diagram, which results in a sample of 152 AGN. By combining our AGN with the literature high-luminosity quasars, we found a tight log-linear relation between the size of the ENLR and the AGN [O III]{\lambda}5007{\AA} luminosity over four orders of magnitude of the [O III] luminosity. The slope of this relation is 0.42 ± 0.02 which can be explained in terms of a distribution of clouds photoionized by the AGN. This relation also indicates the AGN have the potential to ionize and heat the gas clouds at a large distance from the nuclei without the aids of outflows and jets for the low-luminosity Seyferts.
@article{arxiv.1908.02885,
title = {The spatial extension of extended narrow line regions in MaNGA AGN},
author = {Jianhang Chen and Yong Shi and Ross Dempsey and David R. Law and Yanmei Chen and Renbin Yan and Longji Bing and Sandro B. Rembold and Songlin Li and Xiaoling Yu and Rogemar A. Riffel and Joe R. Brownstein and Rogério Riffel},
journal= {arXiv preprint arXiv:1908.02885},
year = {2019}
}