Millimeter/submillimeter search for the sunyaev-zeldovich effect in the coma cluster

R. F. Silverberg, E. S. Cheng, D. A. Cottingham, D. J. Fixsen, C. A. Inman, M. S. Kowitt, S. S. Meyer, L. A. Page, J. L. Puchalla, Y. Rephaeli

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Observations from the first flight of the Medium Scale Anisotropy Measurement (MSAM1-92) are analyzed to search for the Sunyaev-Zeldovich (SZ) effect toward the Coma cluster. This balloon-borne instrument uses a 28′ FWHM beam and a three-position chopping pattern with a throw of ±40′. With spectral channels at 5.7, 9.3, 16.5, and 22.6 cm-1, the observations simultaneously sample the frequency range where the SZ spectral distortion in the intensity transitions from a decrement to an increment and where the fractional intensity change is substantially larger than in the Rayleigh-Jeans region. We set limits on the Comptonization parameter integrated over our antenna pattern, Δy ≤ 8.0 × 10-5 (2 σ). For a spherically symmetric isothermal model, this implies a central Comptonization parameter y0 ≤ 2.0 × 10-4 or a central electron density n0 ≤ 5.8 × 10-3 cm-3 h50, a result consistent with central densities implied by X-ray brightness measurements and central Comptonization estimates from lower frequency observations of the SZ effect.

Original languageEnglish (US)
Pages (from-to)22-25
Number of pages4
JournalAstrophysical Journal
Issue number1 PART I
StatePublished - 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Balloons
  • Cosmic microwave background
  • Cosmology: observations galaxies : clusters : general
  • Intergalactic medium


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