A.P. Cooper
Surface photometry of brightest cluster galaxies and intracluster stars in ΛCDM
Cooper, A.P.; Gao, L.; Guo, Q.; Frenk, C.S.; Jenkins, A.; Springel, V.; White, S.D.M.
Authors
L. Gao
Q. Guo
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Professor Adrian Jenkins a.r.jenkins@durham.ac.uk
Professor
V. Springel
S.D.M. White
Abstract
We simulate the phase-space distribution of stellar mass in nine massive Λ 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 (M200 ≈ 7.5–33 × 1014 M⊙). 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 Mpc2 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 μV ∼ 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.
Citation
Cooper, A., Gao, L., Guo, Q., Frenk, C., Jenkins, A., Springel, V., & White, S. (2015). Surface photometry of brightest cluster galaxies and intracluster stars in ΛCDM. Monthly Notices of the Royal Astronomical Society, 451(3), 2703-2722. https://doi.org/10.1093/mnras/stv1042
Journal Article Type | Article |
---|---|
Acceptance Date | May 7, 2015 |
Publication Date | Aug 11, 2015 |
Deposit Date | Feb 11, 2016 |
Publicly Available Date | Feb 16, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 451 |
Issue | 3 |
Pages | 2703-2722 |
DOI | https://doi.org/10.1093/mnras/stv1042 |
Keywords | Methods: numerical, Galaxies: clusters: general, Galaxies: elliptical and lenticular, cD, Galaxies: haloes, Galaxies: photometry, Galaxies: structure. |
Public URL | https://durham-repository.worktribe.com/output/1391654 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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