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Dark matter content of ETGs and its relation to the local density of galaxies

Published online by Cambridge University Press:  29 March 2021

A. Nigoche-Netro Open the ORCID record for A. Nigoche-Netro [Opens in a new window] ,
G. Ramos-Larios ,
R. Díaz ,
E. de la Fuente ,
P. Lagos ,
A. Ruelas-Mayorga ,
J. Mendez-Abreu Open the ORCID record for J. Mendez-Abreu [Opens in a new window]  and
S. N. Kemp
A. Nigoche-Netro
Affiliation:
Instituto de Astronomía y Meteorología, CUCEI, Universidad de Guadalajara, Guadalajara, Jal. 44130, México email: anigoche@gmail.com
G. Ramos-Larios
Affiliation:
Instituto de Astronomía y Meteorología, CUCEI, Universidad de Guadalajara, Guadalajara, Jal. 44130, México email: anigoche@gmail.com
R. Díaz
Affiliation:
Gemini Observatory, 950 N Cherry Ave, Tucson AZ, USA
E. de la Fuente
Affiliation:
Instituto de Astronomía y Meteorología, CUCEI, Universidad de Guadalajara, Guadalajara, Jal. 44130, México email: anigoche@gmail.com
P. Lagos
Affiliation:
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
A. Ruelas-Mayorga
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Cd. Universitaria, México, D.F. 04510, México
J. Mendez-Abreu
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
S. N. Kemp
Affiliation:
Instituto de Astronomía y Meteorología, CUCEI, Universidad de Guadalajara, Guadalajara, Jal. 44130, México email: anigoche@gmail.com
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Abstract

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We study the behaviour of the dynamical and stellar mass inside the effective radius as function of local density for early-type galaxies (ETGs). We use several samples of ETGs - ranging from 19000 to 98000 objects - from the ninth data release of the Sloan Digital Sky Survey. We consider Newtonian dynamics, different light profiles and different initial mass functions (IMF) to calculate the dynamical and stellar mass. We assume that any difference between these two masses is due to dark matter and/or a non-universal IMF. The main results are: (i) the amount of dark matter (DM) inside ETGs depends on the environment; (ii) ETGs in low-density environments span a wider DM range than ETGs in dense environments; (iii) the amount of DM inside ETGs in the most dense environments will be less than approximately 55-65 per cent of the dynamical mass; (iv) the accurate value of this upper limit depends on the impact of the IMF on the stellar mass estimation.

Keywords

Galaxies: fundamental parametersGalaxies: photometry, distances and redshiftsCosmology: dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 42 - 45
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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