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Study of AGN contribution on morphological parameters of their host galaxies

Published online by Cambridge University Press:  29 January 2021

Tilahun Getachew-Woreta ,
Mirjana Pović ,
Josefa Masegosa ,
Jaime Perea ,
Zeleke Beyoro-Amado  and
Isabel Márquez
Tilahun Getachew-Woreta
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Entoto Observatory and Research Center (EORC), Astronomy and Astrophysics Research and Development Division, P.O.Box 33679, Addis Ababa, Ethiopia Addis Ababa University (AAU), P.O.Box 1176, Addis Ababa, Ethiopia Bule Hora University (BHU), P.O.Box 144, Bule Hora, Ethiopia
Mirjana Pović
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Entoto Observatory and Research Center (EORC), Astronomy and Astrophysics Research and Development Division, P.O.Box 33679, Addis Ababa, Ethiopia Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de de la Astronomía, s/n, 18008, Granada, Spain
Josefa Masegosa
Affiliation:
Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de de la Astronomía, s/n, 18008, Granada, Spain
Jaime Perea
Affiliation:
Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de de la Astronomía, s/n, 18008, Granada, Spain
Zeleke Beyoro-Amado
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Entoto Observatory and Research Center (EORC), Astronomy and Astrophysics Research and Development Division, P.O.Box 33679, Addis Ababa, Ethiopia Addis Ababa University (AAU), P.O.Box 1176, Addis Ababa, Ethiopia
Isabel Márquez
Affiliation:
Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de de la Astronomía, s/n, 18008, Granada, Spain
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Abstract

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We tested how the AGN contribution (5%–75% of the total flux) may affect different morphological parameters commonly used in galaxy classification. We carried out all analysis at z ∼ 0 and at higher redshifts that correspond to the COSMOS field. Using a local training sample of >2000 visually classified galaxies, we carried out all measurements with and without the central source, and quantified how the contribution of a bright nuclear point source could affect different morphological parameters, such as: Abraham and Concelice-Bershady indices, Gini, Asymmetry, M20 moment of light, and Smoothness. We found that concentration indexes are less sensitive to both redshift and brightness in comparison to the other parameters. We also found that all parameters change significantly with AGN contribution. At z ∼ 0, up to a 10% of AGN contribution the morphological classification will not be significantly affect, but for ⩾ 25% of AGN contribution late-type spirals follow the range of parameters of elliptical galaxies and can therefore be misclassified early types.

Keywords

AGNmorphologygalSVM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 158 - 162
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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