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Date and Time of the Query: 2019-08-18 T13:18:36 PDT
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For refcode 2015MNRAS.451.2703C:
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Copyright by Royal Astronomical Society. 2015MNRAS.451.2703C Surface photometry of brightest cluster galaxies and intracluster stars in LambdaCDM Cooper, A. P.; Gao, L.; Guo, Q.; Frenk, C. S.; Jenkins, A.; Springel, V.; White, S. D. M. Abstract. We simulate the phase-space distribution of stellar mass in nine massive Lambda cold dark matter galaxy clusters by applying the semi-analytic particle tagging method of Cooper et al. to the Phoenix suite of high-resolution N-body simulations (M_200_ ~ 7.5-33 x 10^14^ M_sun_). The resulting surface brightness (SB) profiles of brightest cluster galaxies (BCGs) match well to observations. On average, stars formed in galaxies accreted by the BCG account for >~90 per cent of its total mass (the remainder is formed in situ). In circular BCG-centred apertures, the superposition of multiple debris clouds (each >~10 per cent of the total BCG mass) from different progenitors can result in an extensive outer diffuse component, qualitatively similar to a 'cD envelope'. These clouds typically originate from tidal stripping at z <~ 1 and comprise both streams and the extended envelopes of other massive galaxies in the cluster. Stars at very low SB contribute a significant fraction of the total cluster stellar mass budget: in the central 1 Mpc^2^ of a z ~ 0.15 cluster imaged at SDSS-like resolution, our fiducial model predicts 80-95 per cent of stellar mass below a SB of mu_V_ ~ 26.5 mag arcsec^-2^ is associated with accreted stars in the envelope of the BCG. The ratio of BCG stellar mass (including this diffuse component) to total cluster stellar mass is ~30 per cent. Key words: methods: numerical, galaxies: clusters: general, galaxies: elliptical and lenticular, cD, galaxies: haloes, galaxies: photometry, galaxies: structure
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