Three Spectacular HII-buried-AGN Galaxies from SDSS

Abstract

We present our analysis of the three HII-buried-AGN: SDSS J091053+333008, SDSS J121837+091324, and SDSS J153002-020415, by studying their optical spectra extracted from SDSS. The location in the BPT diagnostic diagrams of the three galaxies indicates that the narrow emission lines are mainly exited from HII regions. However, after the removal of the host galaxy's stellar emission, the emission lines display the typical feature of Narrow-line Seyfert 1-like. All of the three objects have large Eddington ratio, small black hole mass, and low star formation rate. We propose that the three galaxies are at the transit stage from the starburst-dominated phase to AGN-dominated phase.

15 pages, 2 figures

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• The Discovery and Nature of Optical Transient CSS100217:102913+404220
• Insights Into AGN and Host Galaxy Co-evolution From Hard X-ray Emission
• Understanding AGN-host connection in partially obscured active galactic nuclei. Part III: Properties of ROSAT-selected SDSS AGNs
• Ongoing Star Formation In AGN Host Galaxy Disks: A View From Core-collapse Supernovae