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Virial masses of galactic halos from galaxy-galaxy lensing: theoretical modeling and application to SDSS | | J. Guzik
; U. Seljak
; | | Date: |
28 Dec 2001 | | Journal: | Mon.Not.Roy.Astron.Soc. 335 (2002) 311 | | Subject: | astro-ph | | Affiliation: | Jagiellonian University), U. Seljak (Princeton University | | Abstract: | We present a theoretical analysis of galaxy-galaxy lensing in the context of halo models with CDM motivated dark matter profiles. The model enables us to separate between the central galactic and noncentral group/cluster contributions. We apply the model to the recent SDSS measurements with known redshifts and luminosities of the lenses. This allows one to accurately model the mass distribution of a local galaxy population around and above $L_{star}$. We find that virial mass of L* galaxy is M*=(5-10)x10^{11}h^{-1}M_{sun}, depending on the color of the galaxy. This value varies significantly with galaxy morphology with M* for late types being a factor of 10 lower in u’, 7 in g’ and a factor of 2.5-3 lower in r’, i’ and z’ relative to early types. Fraction of noncentral galaxies in groups and clusters is estimated to be below 10% for late types and around 30% for early types. Using the luminosity dependence of the signal we find that for early types the virial halo mass M scales with luminosity as M propto L^1.4 in red bands above L*. This shows that the virial mass to light ratio is increasing with luminosity for galaxies above L*, as predicted by theoretical models. The virial mass to light ratio in i’ band is 17(45)hM_{sun}/L_{sun} at L* for late (early) types. Combining this result with cosmological baryon fraction one finds that 0.7(0.25)h^{-1}Upsilon_iOmega_m/12Omega_b of baryons within the virial radius are converted to stars at L*, where Upsilon_i is the stellar mass to light ratio in i’ band. This indicates that both for early and late type galaxies around L* a significant fraction of all the baryons in the halo is transformed into stars. | | Source: | arXiv, astro-ph/0201448 | | Services: | Forum | Review | PDF | Favorites | |
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