Peculiar velocity limits from measurements of the spectrum of the Sunyaev-Zeldovich effect in six clusters of galaxies

B. A. Benson, S. E. Church, P. A.R. Ade, J. J. Bock, K. M. Ganga, J. R. Hinderks, P. D. Mauskopf, B. Philhour, M. C. Runyan, K. L. Thompson

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

We have made measurements of the Sunyaev-Zeldovich (SZ) effect in six galaxy clusters at z > 0.2 using the Sunyaev-Zeldovich Infrared Experiment (SuZIE II) in three frequency bands between 150 and 350 GHz. Simultaneous multifrequency measurements have been used to distinguish between thermal and kinematic components of the SZ effect and to significantly reduce the effects of variations in atmospheric emission that can otherwise dominate the noise. We have set limits to the peculiar velocities of each cluster with respect to the Hubble flow and have used the cluster sample to set a 95% confidence limit of less than 1420 km s-1 to the bulk flow of the intermediate-redshift universe in the direction of the cosmic microwave background dipole. This is the first time that SZ measurements have been used to constrain bulk flows. We show that systematic uncertainties in peculiar velocity determinations from the SZ effect are likely to be dominated by sub-millimeter point sources, and we discuss the level of this contamination.

Original languageEnglish (US)
Pages (from-to)674-691
Number of pages18
JournalAstrophysical Journal
Volume592
Issue number2 I
DOIs
StatePublished - Aug 1 2003
Externally publishedYes

Keywords

  • Cosmic microwave background
  • Cosmology: observations
  • Galaxies: clusters: general
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Benson, B. A., Church, S. E., Ade, P. A. R., Bock, J. J., Ganga, K. M., Hinderks, J. R., Mauskopf, P. D., Philhour, B., Runyan, M. C., & Thompson, K. L. (2003). Peculiar velocity limits from measurements of the spectrum of the Sunyaev-Zeldovich effect in six clusters of galaxies. Astrophysical Journal, 592(2 I), 674-691. https://doi.org/10.1086/375864