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Stellar populations and ionised gas in central spheroidal galaxies

Published online by Cambridge University Press:  29 March 2021

Vanessa Lorenzoni Open the ORCID record for Vanessa Lorenzoni [Opens in a new window]  and
Sandro B. Rembold
Vanessa Lorenzoni
Affiliation:
Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, Brazil email: [email protected]
Sandro B. Rembold
Affiliation:
Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, Brazil email: [email protected]
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Abstract

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We investigate the stellar populations and ionised gas properties of a sample of central spheroidal galaxies in order to better constrain their history of star formation and gas excitation mechanism. We select galaxies from Spheroids Panchromatic Investigation in Different Environmental Regions (SPIDER) catalogue and separate these galaxies in different regimes of halo and galaxy mass. To characterise the stellar population properties of these galaxies we use the stellar population synthesis method with the Starlight code, and the presence of ionised gas is identified by measurements of the Hα equivalent width. We analyse how these properties behave as a function of the galaxy stellar mass and the parent halo mass. A trend is observed in the sense of increased ionised gas emission for low-mass centrals in high-mass halos. We interpret this trend in a scenario of intracluster medium (ICM) cooling versus active galactic nuclei (AGN) feedback in a Bondi accretion context.

Keywords

galaxies: clusters: generalgalaxies: clusters: intracluster mediumgalaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 469 - 472
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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