The baryon fraction in the perseus cluster: Results from spartan

R. G. Cruddace; M. P. Kowalski; G. G. Fritz; W. A. Snyder; E. E. Fenimore; M. P. Ulmer

doi:10.1086/303634

The baryon fraction in the perseus cluster: Results from spartan

R. G. Cruddace^*, M. P. Kowalski, G. G. Fritz, W. A. Snyder, E. E. Fenimore, M. P. Ulmer

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Spatially and spectrally resolved X-ray observations of the Perseus cluster in the 1-10 keV band were made by the Spartan 1 instrument. Analysis of the data reveals that the dark matter comprises 60% of the total mass and is concentrated toward the cluster center. This concentration may be caused by a baryonic component of the dark matter, consisting of cluster gas which has cooled. The average luminous baryon fraction within the cluster is consistent with big bang nucleosynthesis only if the cosmic mass density lies in the range 0.12 < Ω < 0.26 (H₀ = 50 km s^-1 Mpc^-1). The total mass derived from the X-ray data is 40% of that obtained from analysis of the galaxy spatial and velocity distributions.

Original language	English (US)
Pages (from-to)	479-488
Number of pages	10
Journal	Astrophysical Journal
Volume	476
Issue number	2 PART I
DOIs	https://doi.org/10.1086/303634
State	Published - 1997

Keywords

Dark matter
Galaxies: clusters: individual (Perseus)
X-rays: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/303634

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title = "The baryon fraction in the perseus cluster: Results from spartan",

abstract = "Spatially and spectrally resolved X-ray observations of the Perseus cluster in the 1-10 keV band were made by the Spartan 1 instrument. Analysis of the data reveals that the dark matter comprises 60% of the total mass and is concentrated toward the cluster center. This concentration may be caused by a baryonic component of the dark matter, consisting of cluster gas which has cooled. The average luminous baryon fraction within the cluster is consistent with big bang nucleosynthesis only if the cosmic mass density lies in the range 0.12 < Ω < 0.26 (H0 = 50 km s-1 Mpc-1). The total mass derived from the X-ray data is 40% of that obtained from analysis of the galaxy spatial and velocity distributions.",

keywords = "Dark matter, Galaxies: clusters: individual (Perseus), X-rays: galaxies",

author = "Cruddace, {R. G.} and Kowalski, {M. P.} and Fritz, {G. G.} and Snyder, {W. A.} and Fenimore, {E. E.} and Ulmer, {M. P.}",

year = "1997",

doi = "10.1086/303634",

language = "English (US)",

volume = "476",

pages = "479--488",

journal = "Astrophysical Journal",

issn = "0004-637X",

number = "2 PART I",

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TY - JOUR

T1 - The baryon fraction in the perseus cluster

T2 - Results from spartan

AU - Cruddace, R. G.

AU - Kowalski, M. P.

AU - Fritz, G. G.

AU - Snyder, W. A.

AU - Fenimore, E. E.

AU - Ulmer, M. P.

PY - 1997

Y1 - 1997

N2 - Spatially and spectrally resolved X-ray observations of the Perseus cluster in the 1-10 keV band were made by the Spartan 1 instrument. Analysis of the data reveals that the dark matter comprises 60% of the total mass and is concentrated toward the cluster center. This concentration may be caused by a baryonic component of the dark matter, consisting of cluster gas which has cooled. The average luminous baryon fraction within the cluster is consistent with big bang nucleosynthesis only if the cosmic mass density lies in the range 0.12 < Ω < 0.26 (H0 = 50 km s-1 Mpc-1). The total mass derived from the X-ray data is 40% of that obtained from analysis of the galaxy spatial and velocity distributions.

AB - Spatially and spectrally resolved X-ray observations of the Perseus cluster in the 1-10 keV band were made by the Spartan 1 instrument. Analysis of the data reveals that the dark matter comprises 60% of the total mass and is concentrated toward the cluster center. This concentration may be caused by a baryonic component of the dark matter, consisting of cluster gas which has cooled. The average luminous baryon fraction within the cluster is consistent with big bang nucleosynthesis only if the cosmic mass density lies in the range 0.12 < Ω < 0.26 (H0 = 50 km s-1 Mpc-1). The total mass derived from the X-ray data is 40% of that obtained from analysis of the galaxy spatial and velocity distributions.

KW - Dark matter

KW - Galaxies: clusters: individual (Perseus)

KW - X-rays: galaxies

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EP - 488

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART I

ER -

The baryon fraction in the perseus cluster: Results from spartan

Abstract

Keywords

ASJC Scopus subject areas

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