sHansen

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Information about sHansen
Science-Technology

Published on August 29, 2007

Author: Mahugani

Source: authorstream.com

luminosity & color of galaxies in clusters:  luminosity andamp; color of galaxies in clusters sarah m. hansen university of chicago with erin s. sheldon (nyu) risa h. wechsler (stanford) astrophysics with eV photons:  astrophysics with eV photons sarah m. hansen university of chicago with erin s. sheldon (nyu) risa h. wechsler (stanford) outline:  outline motivation sdss data andamp; cluster sample characterizing the galaxy population luminosity function: dependence on cluster mass, galaxy color blue fraction: dependence on cluster mass, redshift, galaxy luminosity andamp; cluster-centric radius motivation:  motivation clusters as cosmological probes how to connect dark and luminous matter? how to connect stars and gas? clusters as galaxy evolution laboratories what’s happened to form such a particular cluster galaxy population? for upcoming large surveys, want to understand these details better sdss clusters:  sdss clusters andgt; 7300 deg2 of ugriz photometric data maxBCG clusters red sequence matched filter (koester et al. 2007a,b) z ≤ 0.3; Dz ~ 0.01 mass proxy: N200 mass - richness scaling mass function andamp; cosmological params (rozo et al. 2007) velocity dispersion (becker et al. 2007) lensing (sheldon et al.; johnston et al.) x-ray (rykoff et al.) 13,823 systems with N200 ≥ 10 and z ≤ 0.3 method:  method measure background-subtracted, k-corrected distribution of galaxies associated with clusters, binned by cluster andamp; galaxy properties comparison with ADDGALs simulations (wechsler et al.) conditional luminosity function:  conditional luminosity function (L|M): important ingredient for understanding how galaxies populate halos color distribution:  radial color trend is due to changing number of galaxies on the red sequence vs in the blue cloud  blue fraction is the info you need color distribution red galaxies; blue galaxies all galaxies blue fraction within r200 :  blue fraction within r200 provides constraints on models of galaxy populations and evolution in clusters blue fraction within r200 :  blue fraction within r200 provides constraints on models of galaxy populations and evolution in clusters blue fraction, in more detail :  blue fraction, in more detail radial trend luminosity trend summary:  summary blue fraction as a function of cluster mass, redshift, radius and magnitude conditional luminosity function for all, red andamp; blue galaxies with sdss data and galaxy-populated simulations, we investigate the properties of cluster galaxies, including: see hansen et al., arXiv:0706.soon

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