Low-mass and High-mass Supermassive Blackholes In Radio-Loud AGNs Are Spun-up in Different Evolution Paths
arXiv:1905.08978 · doi:10.1088/1674-4527/19/10/144
Abstract
How Supermassive Blackholes (SMBHs) are spun-up is a key issue of modern astrophysics. As an extension of the study in Wang et al. (2016), we here address the issue by comparing the host galaxy properties of nearby () radio-selected Seyfert 2 galaxies. With the two-dimensional bulge+disk decompositions for the SDSS -band images, we identify a dichotomy on various host galaxy properties for the radio-powerful SMBHs. By assuming the radio emission from the jet reflects a high SMBH spin, which stems from the well-known BZ mechanism of jet production, high-mass SMBHs (i.e., ) have a preference for being spun-up in classical bulges, and low-mass SMBHs (i.e., ) 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.
arXiv comment10 pages, 3 figures and 1 table, to be published in RAA
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