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Accretion rate in AGN and X-ray-to-optical flux ratio at z ≤ 0.2

Published online by Cambridge University Press:  29 January 2021

Asrate Gaulle ,
Mirjana Pović  and
Dejene Zewdie
Asrate Gaulle
Affiliation:
Dilla University, Department of Physics, Dilla, Ethiopia email: asrieguale@gmail.com Astronomy and Astrophysics Research and Development Division, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia
Mirjana Pović
Affiliation:
Astronomy and Astrophysics Research and Development Division, Ethiopian Space Science and Technology Institute, Addis Ababa, Ethiopia Institute of Astrophysics of Andalucía (IAA-CISC), Department of Extragalactic Astronomy, Granada, Spain
Dejene Zewdie
Affiliation:
Núcleo de Astronomía, Universidad Diego Portales, Santiago, Chile Department of Physics, Debre Berhan University, Debre Berhan, Ethiopia
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Abstract

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We explored a sample of 545 local galaxies using data from the 3XMM-DR7 and SDSS-DR8 surveys. We carried out all analyses up to z ˜ 0.2, and we studied the relation between X/O flux ratio and accretion rate for different classes of active galaxies such as LINERs and Seyfert 2. We obtained a slight correlation between the two parameters if the whole sample of AGN is used. However, LINERs and Sy2 galaxies show different properties, slight correlation and slight anti-correlation, respectively. This could confirm that LINERs and Sy2 galaxies have different accretion efficiencies and maybe different accretion disc properties, as has been suggested previously.

Keywords

galaxies - activeAGN - accretion rateAGN - black hole massesAGN - X-ray propertiesAGN - optical properties
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 314 - 316
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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