How much dark matter is there inside early-type galaxies?

A. Nigoche-Netro, A. Ruelas-Mayorga, P. Lagos, G. Ramos-Larios, C. Kehrig, S. N. Kemp, A. D. Montero-Dorta, J. González-Cervantes

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

6 Citas (Scopus)


© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We study the luminous mass as a function of the dynamical mass inside the effective radius (re) of early-type galaxies (ETGs) to search for differences between these masses. We assume Newtonian dynamics and that any difference between these masses is due to the presence of dark matter. We use several samples of ETGs - ranging from 19 000 to 98 000 objects - from the ninth data release of the Sloan Digital Sky Survey. We perform Monte Carlo (MC) simulations (see Appendix A) of galaxy samples and compare them with real samples. The main results are (i) MC simulations show that the distribution of the dynamical versus luminous mass depends on the mass range where the ETGs are distributed (geometric effect). This dependence is caused by selection effects and intrinsic properties of the ETGs. (ii) The amount of dark matter inside re is approximately 7 ± 22 per cent. (iii) This amount of dark matter is lower than the minimum estimate (10 per cent) found in the literature and four times lower than the average (30 per cent) of literature estimates. However, if we consider the associated error, our estimate is of the order of the literature average.
Idioma originalInglés estadounidense
Páginas (desde-hasta)85-103
Número de páginas19
PublicaciónMonthly Notices of the Royal Astronomical Society
EstadoPublicada - 1 ene 2015
Publicado de forma externa

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