Vol 19, No 10 (2019) / Wang

Low-mass and high-mass supermassive black holes in radio-loud AGNs are spun-up in different evolution paths

Jing Wang, Min-Zhi Kong, Shun-Fang Liu, Da-Wei Xu, Qiang Zhang, Jian-Yan Wei

Abstract

How supermassive black holes (SMBHs) are spun-up is a key issue in modern astrophysics. As an extension to the study in Wang et al., here we address the issue by comparing the host galaxy properties of nearby (z < 0.05) radio-selected Seyfert 2 galaxies. With the two-dimensional bulge+disk decompositions for the SDSS r-band images, we identify a dichotomy in various host galaxy properties for radio-loud SMBHs. By assuming that radio emission from the jet reflects a high SMBH spin, which stems from the well-known Blandford-Znajek mechanism of jet production, high-mass SMBHs (i.e., MBH > 10 7.9 M) have a preference for being spun-up in classical bulges, and low-mass SMBHs (i.e., MBH= 106−7 M) in pseudo-bulges. This dichotomy suggests and confirms that high-mass and low-mass SMBHs are spun-up in different ways, i.e., a major “dry” merger and a secular evolution respectively.

Keywords


galaxies: bulges — galaxies: nuclei — galaxies: Seyfert

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DOI: https://doi.org/10.1088/1674–4527/19/10/144

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