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Detailed characterisation of LINERs and retired galaxies in the local universe

Published online by Cambridge University Press:  29 January 2021

Daudi T. Mazengo ,
Mirjana Pović ,
Noorali T. Jiwaji  and
Jefta M. Sunzu
Daudi T. Mazengo
Affiliation:
The University of Dodoma (UDOM), College of Natural and Mathematical Sciences P.O. Box 338, Dodoma, Tanzania, email: [email protected]
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), 18008Granada, Spain
Noorali T. Jiwaji
Affiliation:
The Open University of Tanzania (OUT), Faculty of Science, Technology and Environmental Studies, P.O. Box 23409, Dar es Salaam, Tanzania
Jefta M. Sunzu
Affiliation:
The University of Dodoma (UDOM), College of Natural and Mathematical Sciences P.O. Box 338, Dodoma, Tanzania, email: [email protected]
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Abstract

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We present a detailed characterisation of physical properties of low-ionization nuclear emission-line regions (LINERs) and retired galaxies (RGs) in the local universe for redshift range 0 < z < 0.4 and two subranges z < 0.4 and 0.1 < z < 0.4. Furthermore, we test the effectiveness of WHAN diagnostic diagram in separating the two populations. We used photometric data, public spectroscopic data and morphological classification from SDSS-DR8, MPA-JHU SDSS-DR8 catalogue and Galaxy Zoo survey, respectively. We studied the distribution of LINERs, RGs and AGN-LINERs in relation to luminosity, stellar mass, star formation rate (SFR), colour, and their location on the SFR-stellar mass and colour-stellar mass diagrams. We then studied the morphologies of both populations. Results have shown that for higher redshift range, AGN-LINERs have higher apparent g magnitude, SFRs and dominate on/above the main sequence (MS) of star formation compared to RGs. However, both populations have similar stellar mass and luminosity distributions at all redshift ranges hence suggesting a significant difference in terms of star formation of RGs and AGN-LINERs with redshift. However, larger and more complete samples of LINERs are needed from the future surveys (e.g., LSST) and missions (e.g., JWST) to study in more details the properties of RGs and AGN-LINERs and find alternative methods of separating the two populations, since using simply WHAN diagram from our study we do not find it to be effective for separating the two populations.

Keywords

LINERsretired galaxiesWHAN diagnostic method
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 323 - 325
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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