The relation of optical/UV and X-ray emission in low-luminosity active galactic nuclei
Abstract
We study the relation of optical/UV and X-ray emission in the low luminosity active galactic nuclei (LLAGNs), using a sample of 49 sources including 28 local Seyfert galaxies and 21 low-ionization nuclear emission-line regions (LINERs) with the optical/UV spectral luminosity at the wavelength λ=2500, 23.0≤ L(2500)(erg/s/Hz)≤ 27.7, and the X-ray spectral luminosity at 2 keV, 20.5≤ L(2 keV)≤ 25.3. The strong correlations are found between the X-ray luminosity and the optical/UV to X-ray index, αox, with the optical/UV luminosity, with the slopes very similar to the findings for the luminous AGNs in the previous works. The correlation between αox and L(2 keV) is very weak as that found for the luminous AGNs in the majority of previous similar works. We also study the relation between $α ox and the Eddington ratio Lbol/LEdd for our sample and find a significant anti-correlation for the sources with Lbol/LEdd 10-3, which is opposite to the correlation between the two variables for the luminous AGNs. Using the advection dominated accretion flow (ADAF) model, we roughly reproduce this anti-correlationship for the two variables for the LLAGNs. This result strongly supports the ADAF as a candidate accretion mode in LLAGNs.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.