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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2011
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57120957004 |
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Table of Contents:
- ON THE STELLAR AND BARYONIC MASS FRACTIONS OF CENTRAL BLUE AND RED GALAXIES A. Rodríguez-Puebla V. Avila-Reese C. Firmani P. Colín Física, Astronomía y Matemáticas Dark matter mass function galaxies: luminosity function Using the abundance matching technique, we infer the local stellar and baryonic mass-halo mass (MsMh and MbMh) relations separately for central blue and red galaxies (BGs and RGs). The observational inputs are the SDSS central BG and RG stellar mass functions and the measured gas mass-Ms relations. For halos associated to central BGs, the distinct CDM halo mass function is used and set up to exclude: (i) the observed group/cluster mass function and (ii) halos with a central major merger at resdshifts z 0.8. For central RGs, the complement of this mass function to the total one is used. At Mh > 1011.5 M, the Ms of RGs tend to be higher than those of BGs for a given Mh, the difference not being larger than 1.7. At Mh < 1011.5 M, this trend is inverted. For BGs (RGs): (a) the maximum value of fs = Ms/Mh is 0.021+0.016 0.009 (0.034+0.026 0.015) and it is attained at log(Mh/M) = 12.0 (= 11.9); (b) fs Mh (fs Mh 3) at the low-mass end while at the high-mass end, fs Mh 0.4 (fs Mh 0.6). The baryon mass fractions, fb=Mb/Mh, of BGs and RGs reach maximum values of fb = 0.028+0.018 0.011 and fb = 0.034+0.025 0.014, respectively. At Mh < 1011.3 M, the dependence of fb on Mh is much steeper for RGs than for BGs. We discuss the differences found in the fsMh and fbMh relations between BGs and RGs in the light of semi-empirical galaxy evolution inferences. 2011 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57120957004 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.47