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The origin of X-ray emission in Low-Excitation Radio Galaxies

Published online by Cambridge University Press:  29 January 2021

Shuang-Liang Li
Shuang-Liang Li*
Affiliation:
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China email: lisl@shao.ac.cn
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Abstract

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In previous works, the radio-X-ray slope in FRI radio galaxies is found to be steeper compared with that in low-luminosity AGNs, indicating different origin of the X-ray emission. Here we reinvestigate this point by compiling a sample of 13 low-excitation radio galaxies (LERG) from 3CR radio catalog of galaxies, where the central engine in LERG is accepted to be a radiatively inefficient accretion flow (RIAF). The core radio and X-ray emissions in all the objects of our sample are detected by VLA/VLBI/VLBA and Chandra/XMM-Newton, respectively. Surprisingly, a shallower slope of Lr – Lx relation () is given by our sample, which demonstrates that the X-ray emission in LERG may come from accretion disk rather than a jet as suggested by previous works. In addition, the slope in the fundamental plane ((log LR = 0.52 log LX + 0.84 log MBH + 10.84) of LERG is found to be well consistent with that reported by Merloni et al. (2003).

Keywords

accretionaccretion disksblack hole physicsgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 243 - 246
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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