%0 Generic %1 Leauthaud2011 %A Leauthaud, Alexie %A George, Matthew R. %A Behroozi, Peter S. %A Bundy, Kevin %A Tinker, Jeremy %A Wechsler, Risa H. %A Conroy, Charlie %A Finoguenov, Alexis %A Tanaka, Masayuki %D 2011 %K dark halos masses matter sellar %T The integrated stellar content of dark matter halos %U http://arxiv.org/abs/1109.0010 %X Measurements of the total amount of stars locked up in galaxies as a function of host halo mass contain key clues about the efficiency of processes that regulate star formation. We derive the total stellar mass fraction f_star as a function of halo mass M500c from z=0.2 to z=1 using two complementary methods. First, we derive f_star using a statistical Halo Occupation Distribution model jointly constrained by data from lensing, clustering, and the stellar mass function. This method enables us to probe f_star over a much wider halo mass range than with group or cluster catalogs. Second, we derive f_star at group scales using a COSMOS X-ray group catalog and we show that the two methods agree to within 30%. We quantify the systematic uncertainty on f_star using abundance matching methods and we show that the statistical uncertainty on f_star (~10%) is dwarfed by systematic uncertainties associated with stellar mass measurements (~45% excluding IMF uncertainties). Assuming a Chabrier IMF, we find 0.012<f_star<0.025 at M500c=10^13 Msun and 0.0057<f_star<0.015 at M500c=10^14 Msun. These values are significantly lower than previously published estimates. We investigate the cause of this difference and find that previous work has overestimated f_star due to a combination of inaccurate stellar mass estimators and/or because they have assumed that all galaxies in groups are early type galaxies with a constant mass-to-light ratio. Contrary to previous claims, our results suggest that the mean value of f_star is always significantly lower than f_gas for halos above 10^13 Msun. Combining our results with recently published gas mas fractions, we find a shortfall in f_star+f_gas at R500c compared to the cosmic mean. This shortfall varies with halo mass and becomes larger towards lower halos masses.

@misc{Leauthaud2011, abstract = { Measurements of the total amount of stars locked up in galaxies as a function of host halo mass contain key clues about the efficiency of processes that regulate star formation. We derive the total stellar mass fraction f_star as a function of halo mass M500c from z=0.2 to z=1 using two complementary methods. First, we derive f_star using a statistical Halo Occupation Distribution model jointly constrained by data from lensing, clustering, and the stellar mass function. This method enables us to probe f_star over a much wider halo mass range than with group or cluster catalogs. Second, we derive f_star at group scales using a COSMOS X-ray group catalog and we show that the two methods agree to within 30%. We quantify the systematic uncertainty on f_star using abundance matching methods and we show that the statistical uncertainty on f_star (~10%) is dwarfed by systematic uncertainties associated with stellar mass measurements (~45% excluding IMF uncertainties). Assuming a Chabrier IMF, we find 0.012<f_star<0.025 at M500c=10^13 Msun and 0.0057<f_star<0.015 at M500c=10^14 Msun. These values are significantly lower than previously published estimates. We investigate the cause of this difference and find that previous work has overestimated f_star due to a combination of inaccurate stellar mass estimators and/or because they have assumed that all galaxies in groups are early type galaxies with a constant mass-to-light ratio. Contrary to previous claims, our results suggest that the mean value of f_star is always significantly lower than f_gas for halos above 10^13 Msun. Combining our results with recently published gas mas fractions, we find a shortfall in f_star+f_gas at R500c compared to the cosmic mean. This shortfall varies with halo mass and becomes larger towards lower halos masses. }, added-at = {2011-09-02T05:44:58.000+0200}, author = {Leauthaud, Alexie and George, Matthew R. and Behroozi, Peter S. and Bundy, Kevin and Tinker, Jeremy and Wechsler, Risa H. and Conroy, Charlie and Finoguenov, Alexis and Tanaka, Masayuki}, biburl = {https://www.bibsonomy.org/bibtex/27e0da24f8cfc07859fe87a25a597420d/miki}, description = {[1109.0010] The integrated stellar content of dark matter halos}, interhash = {9e8086d6407ede00dc0eb393bb4d10b6}, intrahash = {7e0da24f8cfc07859fe87a25a597420d}, keywords = {dark halos masses matter sellar}, note = {cite arxiv:1109.0010Comment: Submitted to ApJ. 16 Pages, 11 Figures. Comments Welcome}, timestamp = {2011-09-02T05:44:58.000+0200}, title = {The integrated stellar content of dark matter halos}, url = {http://arxiv.org/abs/1109.0010}, year = 2011 }