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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2017

Effect of different cosmologies on the galaxy stellar mass function

Amanda R. Lopes
  • Function : Author
C. Gruppioni
  • Function : Author
M. B. Ribeiro
  • Function : Author
L. Pozzetti
  • Function : Author
S. February
  • Function : Author
F. Pozzi
  • Function : Author


The goal of this paper is to understand how the underlying cosmological models may affect the analysis of the stellar masses in galaxies. We computed the galaxy stellar mass function (GSMF) assuming the observationally constrained Lemaitre‐Tolman‐Bondi (LTB) `giantvoid' models and compared them with the results from the standard cosmological model. Based on a sample of 220 000 KS‐band selected galaxies from the UltraVISTA data, we computed the GSMF up to z approximate to 4 assuming different cosmologies, since, from a cosmological perspective, the two quantities that affect the stellarmass estimation are the luminosity distance and time. The results show that the stellar mass decreased on average by similar to 1.1‐27.1 per cent depending on the redshift value. For the GSMF, we fitted a double‐Schechter function to the data and verified that a change is only seen in two parameters, M* and phi*(1), but always with less than a 3s significance. We also carried out an additional analysis for the blue and red populations in order to verify a possible change on the galaxy evolution scenario. The results showed that the GSMF derived with the red population sample is more affected by the change of cosmology than the blue one. We also found out that the LTB models overestimated the number density of galaxies with M< 10(11) M‐circle dot, and underestimate it for M > 10(11) M‐circle dot, as compared to the standard model over the whole studied redshift range. This feature is noted in the complete, red plus blue, sample. Once we compared the general behaviour of the GSMF derived from the alternative cosmological models with the one based on the standard cosmology we found out that the variation was not large enough to change the shape of the function. Hence, the GSMF was found to be robust under this change of cosmology. This means that all physical interpretations of the GSMF based in the standard cosmological model are valid on the LTB cosmology.
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hal-01678438 , version 1 (08-12-2023)



Amanda R. Lopes, C. Gruppioni, M. B. Ribeiro, L. Pozzetti, S. February, et al.. Effect of different cosmologies on the galaxy stellar mass function. Monthly Notices of the Royal Astronomical Society, 2017, 471 (3), pp.3098-3111. ⟨10.1093/mnras/stx1799⟩. ⟨hal-01678438⟩
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