NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T04:13:29 PDT
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For refcode 2009MNRAS.399..349G:
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Copyright by Royal Astronomical Society. 2009MNRAS.399..349G The anticorrelation between the hard X-ray photon index and the Eddington ratio in low-luminosity active galactic nuclei Gu, Minfeng; Cao, Xinwu Abstract. We find a significant anticorrelation between the hard X-ray photon index {GAMMA} and the Eddington ratio L_bol_/L_Edd_ for a sample of low-ionization nuclear emission-line regions and local Seyfert galaxies, compiled from literature with Chandra or XMM-Newton observations. This result is in contrast with the positive correlation found in luminous active galactic nuclei (AGN), while it is similar to that of X-ray binaries (XRBs) in the low/hard state. Our result is qualitatively consistent with the spectra produced from advection-dominated accretion flows (ADAFs). It implies that the X-ray emission of low-luminosity active galactic nuclei (LLAGN) may originate from the Comptonization process in ADAF, and the accretion process in LLAGN may be similar to that of XRBs in the low/hard state, which is different from that in luminous AGN. Key words: accretion, accretion discs, galaxies: active, galaxies: nuclei, X-rays: galaxies
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