The halo-to-stellar mass ratio in the S 4 G

We use 3.6 μm photometry for 1154 disk galaxies ( i < 65°) in the S 4 G (Sheth et al. 2010). We obtain the average stellar component of the circular velocity ( V disk ) and the mean (dark matter) halo-to-stellar mass ratio ( M halo / M * ) inside the optical radius ( R opt ) in bins of total stel...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2016-03, Vol.11 (S321), p.281-281
Main Authors: Díaz-García, Simón, Salo, Heikki, Laurikainen, Eija
Format: Article
Language:English
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Summary:We use 3.6 μm photometry for 1154 disk galaxies ( i < 65°) in the S 4 G (Sheth et al. 2010). We obtain the average stellar component of the circular velocity ( V disk ) and the mean (dark matter) halo-to-stellar mass ratio ( M halo / M * ) inside the optical radius ( R opt ) in bins of total stellar mass ( M * , from Muñoz-Mateos et al. 2015), providing observational constraints for galaxy formation models to be tested against. We find the M halo / M * − M * relation in good agreement with the best-fit model at z ≈ 0 in ΛCDM cosmological simulations (e.g. Moster 2010), assuming that the dark matter halo within R opt comprises a constant fraction (~ 4%) of its total mass.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921316009182