Correlation analysis of radio properties and accretion-disk luminosity for low luminosity AGNs
详细信息 查看全文
- 作者：Renzhi Su ; Xiang Liu ; Zhen Zhang
- 关键词：Black hole physics ; Galaxies ; jets ; Quasars ; general ; Accretion ; accretion disks
- 刊名：Astrophysics and Space Science
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：362
- 期：1
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Astrophysics and Astroparticles; Astronomy, Observations and Techniques; Cosmology; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics); Astrobiology;
- 出版者：Springer Netherlands
- ISSN：1572-946X
- 卷排序：362
文摘
The correlation between the jet power and accretion disk luminosity is investigated and analyzed with our model for 7 samples of low luminosity active galactic nuclei (LLAGNs). The main results are: (1) the power-law correlation index (\(P_{jet} \propto L_{disk} ^{\mu}\)) typically ranges \(\mu=0.4\mbox{--}0.7\) for the LLAGN samples, and there is a hint of steep index for the LLAGN sample which hosted by a high fraction of elliptical galaxies, and there are no significant correlation between the \(\mu\) and the LLAGN types (Seyfert, LINER); (2) for \(\mu\approx\)1, as noted in Liu et al., the accretion disk dominates the jet power and the black hole (BH) spin is not important, for the LLAGN samples studied in this paper we find that the \(\mu\) is significantly less than unity, implying that BH spin may play a significant role in the jet power of LLAGNs; (3) the BH spin-jet power is negatively correlated with the BH mass in our model, which means a high spin-jet efficiency in the ‘low’ BH-mass LLAGNs; (4) an anti-correlation between radio loudness and disk luminosity is found, which is apparently due to the flatter power-law index in the jet-disk correlation of the LLAGNs, and the radio loudness can be higher in the LLAGNs than in luminous AGNs/quasars when the BH spin-jet power is comparable to or dominate over the accretion-jet power in the LLAGNs. The high radio-core dominance of the LLAGNs is also discussed.