The baryon budget on the galaxy group/cluster boundary

Alastair J R Sanderson, Ewan O'Sullivan, Trevor J. Ponman, Anthony H. Gonzalez, Suresh Sivanandam, Ann I Zabludoff, Dennis F Zaritsky

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present a study of the hot gas and stellar content of five optically selected poor galaxy clusters, including a full accounting of the contribution from intracluster light (ICL) and a combined hot gas and hydrostatic X-ray mass analysis with XMM-Newton observations. We find weighted mean stellar (including ICL), gas and total baryon mass fractions within r500 of 0.026 ± 0.003, 0.070 ± 0.005 and 0.096 ± 0.006, respectively, at a corresponding weighted mean M500 of (1.08-0.18+0.21) × 1014 M. Even when accounting for the intracluster stars, four out of five clusters show evidence for a substantial baryon deficit within r500, with baryon fractions (fb) between 50 ± 6 and 59 ± 8 per cent of the universal mean level (i.e. Ωbm), the remaining cluster having fb = 75±11 per cent. For the three clusters where we can trace the hot halo to r500 we find no evidence for a steepening of the gas density profile in the outskirts with respect to a power law, as seen in more massive clusters. We find that in all cases, the X-ray mass measurements are larger than those originally published on the basis of the galaxy velocity dispersion (σ) and an assumed σ-M500 relation, by a factor of 1.7-5.7. Despite these increased masses, the stellar fractions (in the range 0.016-0.034, within r500) remain consistent with the trend with mass published by Gonzalez et al., from which our sample is drawn.

Original languageEnglish (US)
Pages (from-to)3288-3304
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume429
Issue number4
DOIs
StatePublished - Mar 11 2013

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galactic clusters
budgets
baryons
high temperature gases
gas
galaxies
gas density
XMM-Newton telescope
hydrostatics
newton
halos
power law
x rays
budget
trends
stars
profiles
gases

Keywords

  • Cosmology: observations -X-rays: galaxies: clusters
  • Galaxies: clusters: general
  • Galaxies: evolution
  • Galaxies: stellar content

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

The baryon budget on the galaxy group/cluster boundary. / Sanderson, Alastair J R; O'Sullivan, Ewan; Ponman, Trevor J.; Gonzalez, Anthony H.; Sivanandam, Suresh; Zabludoff, Ann I; Zaritsky, Dennis F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 429, No. 4, 11.03.2013, p. 3288-3304.

Research output: Contribution to journalArticle

Sanderson, AJR, O'Sullivan, E, Ponman, TJ, Gonzalez, AH, Sivanandam, S, Zabludoff, AI & Zaritsky, DF 2013, 'The baryon budget on the galaxy group/cluster boundary', Monthly Notices of the Royal Astronomical Society, vol. 429, no. 4, pp. 3288-3304. https://doi.org/10.1093/mnras/sts586
Sanderson AJR, O'Sullivan E, Ponman TJ, Gonzalez AH, Sivanandam S, Zabludoff AI et al. The baryon budget on the galaxy group/cluster boundary. Monthly Notices of the Royal Astronomical Society. 2013 Mar 11;429(4):3288-3304. https://doi.org/10.1093/mnras/sts586
Sanderson, Alastair J R ; O'Sullivan, Ewan ; Ponman, Trevor J. ; Gonzalez, Anthony H. ; Sivanandam, Suresh ; Zabludoff, Ann I ; Zaritsky, Dennis F. / The baryon budget on the galaxy group/cluster boundary. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 429, No. 4. pp. 3288-3304.
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