An X-ray view of central engines of low luminosity quasars (LLQSO) in the local Universe
Sibasish Laha (UCSD), Ritesh Ghosh, Matteo Guainazzi, and Alex G., Markowitz

TL;DR
This study conducts a systematic X-ray spectral analysis of low luminosity quasars (LLQSO) in the local universe, revealing their central engines are similar to higher redshift quasars, with differences mainly due to lower black hole masses.
Contribution
It provides the first detailed X-ray spectral analysis of a well-defined LLQSO sample, linking their properties to those of more luminous quasars and local Seyfert galaxies.
Findings
LLQSOs have similar Eddington rate distributions as higher redshift quasars.
No significant neutral obscuration detected in LLQSO X-ray spectra.
Molecular gas presence in host galaxies does not correlate with AGN accretion rates.
Abstract
We have carried out a systematic X-ray spectral analysis of a sample of low luminosity quasars (LLQSO) to investigate the nature of the central engines of these sources. The optically-selected LLQSO sample consists of close, known bright active galactic nuclei (AGN) which serves as an important link between the powerful quasars at higher redshift and local Seyfert galaxies. We find that although the bolometric luminosities of the LLQSOs are lower than those of the higher redshift quasars by almost an order of magnitude, their distribution of the Eddington rate is similar. We detect a strong anti-correlation between and , as has also been detected in several other quasar studies with large sample sizes, indicating that as the UV luminosity of the source increases, the X-ray luminosity decreases. We do not detect any significant…
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