Observations of the Sunyaev-Zel'dovich effect in the z = 0.78 cluster MS 1137.5+6625

Garret Cotter; Helen J. Buttery; Rhiju Das; Michael E. Jones; Keith Grainge; G. G. Pooley; Richard Saunders

doi:10.1046/j.1365-8711.2002.05262.x

Observations of the Sunyaev-Zel'dovich effect in the z = 0.78 cluster MS 1137.5+6625

Garret Cotter, Helen J. Buttery, Rhiju Das, Michael E. Jones, Keith Grainge, G. G. Pooley, Richard Saunders

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

Abstract

We have observed the z = 0.78 cluster MS 1137.5+6625 with the Ryle Telescope (RT) at 15 GHz. After subtraction of contaminating radio sources in the field, we find a Sunyaev-Zel'dovich flux decrement of -421 ± 60 μJy on the ≈0.65 kλ baseline of the RT, spatially coincident with the optical and X-ray positions for the cluster core. For a spherical King-profile cluster model, the best fit to our flux measurement has a core radius θC = 20 arcsec, consistent with previous X-ray observations, and a central temperature decrement ΔT = 650 ± 92 μΚ. Using this model, we calculate that the cluster has a gas mass inside a 500 A-165 kpc radius of 2.9 × 1013 ΜM⊙ for an ΩΜ = 1 universe and 1.6 × 1013 Μ⊙ for ΩΜ = 0.3, ΩΛ = 0.7. We compare this model with existing measurements of the total mass of the cluster, based on gravitational lensing, and estimate a gas fraction for MS 1137.5+6625 of ≈8 per cent.

Original language	English
Pages (from-to)	323-326
Number of pages	3
Journal	Monthly Notices of the Royal Astronomical Society
Volume	334
Issue number	2
DOIs	https://doi.org/10.1046/j.1365-8711.2002.05262.x
Publication status	Published - 1 Aug 2002

Keywords

Cosmology: observations
Galaxies: clusters: individual: MS 1137.5+6625

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10.1046/j.1365-8711.2002.05262.x

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title = "Observations of the Sunyaev-Zel'dovich effect in the z = 0.78 cluster MS 1137.5+6625",

abstract = "We have observed the z = 0.78 cluster MS 1137.5+6625 with the Ryle Telescope (RT) at 15 GHz. After subtraction of contaminating radio sources in the field, we find a Sunyaev-Zel'dovich flux decrement of -421 ± 60 μJy on the ≈0.65 kλ baseline of the RT, spatially coincident with the optical and X-ray positions for the cluster core. For a spherical King-profile cluster model, the best fit to our flux measurement has a core radius θC = 20 arcsec, consistent with previous X-ray observations, and a central temperature decrement ΔT = 650 ± 92 μΚ. Using this model, we calculate that the cluster has a gas mass inside a 500 A-165 kpc radius of 2.9 × 1013 ΜM⊙ for an ΩΜ = 1 universe and 1.6 × 1013 Μ⊙ for ΩΜ = 0.3, ΩΛ = 0.7. We compare this model with existing measurements of the total mass of the cluster, based on gravitational lensing, and estimate a gas fraction for MS 1137.5+6625 of ≈8 per cent.",

keywords = "Cosmology: observations, Galaxies: clusters: individual: MS 1137.5+6625",

author = "Garret Cotter and Buttery, {Helen J.} and Rhiju Das and Jones, {Michael E.} and Keith Grainge and Pooley, {G. G.} and Richard Saunders",

year = "2002",

month = aug,

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doi = "10.1046/j.1365-8711.2002.05262.x",

language = "English",

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pages = "323--326",

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T1 - Observations of the Sunyaev-Zel'dovich effect in the z = 0.78 cluster MS 1137.5+6625

AU - Cotter, Garret

AU - Buttery, Helen J.

AU - Das, Rhiju

AU - Jones, Michael E.

AU - Grainge, Keith

AU - Pooley, G. G.

AU - Saunders, Richard

PY - 2002/8/1

Y1 - 2002/8/1

N2 - We have observed the z = 0.78 cluster MS 1137.5+6625 with the Ryle Telescope (RT) at 15 GHz. After subtraction of contaminating radio sources in the field, we find a Sunyaev-Zel'dovich flux decrement of -421 ± 60 μJy on the ≈0.65 kλ baseline of the RT, spatially coincident with the optical and X-ray positions for the cluster core. For a spherical King-profile cluster model, the best fit to our flux measurement has a core radius θC = 20 arcsec, consistent with previous X-ray observations, and a central temperature decrement ΔT = 650 ± 92 μΚ. Using this model, we calculate that the cluster has a gas mass inside a 500 A-165 kpc radius of 2.9 × 1013 ΜM⊙ for an ΩΜ = 1 universe and 1.6 × 1013 Μ⊙ for ΩΜ = 0.3, ΩΛ = 0.7. We compare this model with existing measurements of the total mass of the cluster, based on gravitational lensing, and estimate a gas fraction for MS 1137.5+6625 of ≈8 per cent.

AB - We have observed the z = 0.78 cluster MS 1137.5+6625 with the Ryle Telescope (RT) at 15 GHz. After subtraction of contaminating radio sources in the field, we find a Sunyaev-Zel'dovich flux decrement of -421 ± 60 μJy on the ≈0.65 kλ baseline of the RT, spatially coincident with the optical and X-ray positions for the cluster core. For a spherical King-profile cluster model, the best fit to our flux measurement has a core radius θC = 20 arcsec, consistent with previous X-ray observations, and a central temperature decrement ΔT = 650 ± 92 μΚ. Using this model, we calculate that the cluster has a gas mass inside a 500 A-165 kpc radius of 2.9 × 1013 ΜM⊙ for an ΩΜ = 1 universe and 1.6 × 1013 Μ⊙ for ΩΜ = 0.3, ΩΛ = 0.7. We compare this model with existing measurements of the total mass of the cluster, based on gravitational lensing, and estimate a gas fraction for MS 1137.5+6625 of ≈8 per cent.

KW - Cosmology: observations

KW - Galaxies: clusters: individual: MS 1137.5+6625

U2 - 10.1046/j.1365-8711.2002.05262.x

DO - 10.1046/j.1365-8711.2002.05262.x

M3 - Article

SN - 1365-2966

VL - 334

SP - 323

EP - 326

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

Observations of the Sunyaev-Zel'dovich effect in the z = 0.78 cluster MS 1137.5+6625

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