A measurement of the hubble constant from the X-ray properties and the sunyaev-zeldovich effect of CL 0016+16

John Hughes, Mark Birkinshaw

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

A value of the Hubble constant has been determined from a comparison of the X-ray properties and Sunyaev-Zeldovich effect of the distant rich cluster of galaxies CL 0016+16. The cluster, as imaged by the ROSAT PSPC, is significantly elliptical, and we present the techniques we have developed to include this in our analysis. Assuming a smooth, isothermal gas distribution, we obtain a value H0 = 47-15+23 km s-1 Mpc-1, where the errors include systematic and random uncertainties but are purely observational. Systematic errors in deprojecting the elliptical surface brightness distribution due to prolate and oblate geometries as well as arbitrary inclination angles, introduce an additional fractional error of ±17% in H0. At the redshift of CL 0016+16 (z = 0.5455) the effect of the cosmological parameters on the derived H0 value is of order 10%-20%; we quote results for q0 = 0.1. Combining this result with X-ray/SZ effect H0 determinations from seven other clusters and taking account of systematic uncertainties in our models for the cluster atmosphere, we find an ensemble value of H0 = 42-61 km s-1 Mpc-1 with an additional random error of ±16%.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalAstrophysical Journal
Volume501
Issue number1 PART I
DOIs
StatePublished - Jan 1 1998

Fingerprint

Sunyaev-Zeldovich effect
Hubble constant
random errors
systematic errors
x rays
brightness distribution
inclination
geometry
atmosphere
galaxies
gas
atmospheres
effect
gases
distribution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Intergalactic medium

Cite this

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abstract = "A value of the Hubble constant has been determined from a comparison of the X-ray properties and Sunyaev-Zeldovich effect of the distant rich cluster of galaxies CL 0016+16. The cluster, as imaged by the ROSAT PSPC, is significantly elliptical, and we present the techniques we have developed to include this in our analysis. Assuming a smooth, isothermal gas distribution, we obtain a value H0 = 47-15+23 km s-1 Mpc-1, where the errors include systematic and random uncertainties but are purely observational. Systematic errors in deprojecting the elliptical surface brightness distribution due to prolate and oblate geometries as well as arbitrary inclination angles, introduce an additional fractional error of ±17{\%} in H0. At the redshift of CL 0016+16 (z = 0.5455) the effect of the cosmological parameters on the derived H0 value is of order 10{\%}-20{\%}; we quote results for q0 = 0.1. Combining this result with X-ray/SZ effect H0 determinations from seven other clusters and taking account of systematic uncertainties in our models for the cluster atmosphere, we find an ensemble value of H0 = 42-61 km s-1 Mpc-1 with an additional random error of ±16{\%}.",
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A measurement of the hubble constant from the X-ray properties and the sunyaev-zeldovich effect of CL 0016+16. / Hughes, John; Birkinshaw, Mark.

In: Astrophysical Journal, Vol. 501, No. 1 PART I, 01.01.1998, p. 1-14.

Research output: Contribution to journalArticle

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AB - A value of the Hubble constant has been determined from a comparison of the X-ray properties and Sunyaev-Zeldovich effect of the distant rich cluster of galaxies CL 0016+16. The cluster, as imaged by the ROSAT PSPC, is significantly elliptical, and we present the techniques we have developed to include this in our analysis. Assuming a smooth, isothermal gas distribution, we obtain a value H0 = 47-15+23 km s-1 Mpc-1, where the errors include systematic and random uncertainties but are purely observational. Systematic errors in deprojecting the elliptical surface brightness distribution due to prolate and oblate geometries as well as arbitrary inclination angles, introduce an additional fractional error of ±17% in H0. At the redshift of CL 0016+16 (z = 0.5455) the effect of the cosmological parameters on the derived H0 value is of order 10%-20%; we quote results for q0 = 0.1. Combining this result with X-ray/SZ effect H0 determinations from seven other clusters and taking account of systematic uncertainties in our models for the cluster atmosphere, we find an ensemble value of H0 = 42-61 km s-1 Mpc-1 with an additional random error of ±16%.

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