High spectral resolution measurement of the Sunyaev-Zel'dovich effect null with Z-Spec

M. Zemcov, J. Aguirre, J. Bock, C. M. Bradford, N. Czakon, J. Glenn, S. R. Golwala, R. Lupu, P. Maloney, Philip Mauskopf, E. Million, E. J. Murphy, B. Naylor, H. Nguyen, M. Rosenman, J. Sayers, K. S. Scott, J. Zmuidzinas

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The Sunyaev-Zel'dovich (SZ) effect spectrum crosses through a null where ΔTCMB = 0 near ν0 = 217GHz. In a cluster of galaxies, ν0 can be shifted from the canonical thermal SZ effect value by corrections to the SZ effect scattering due to the properties of the inter-cluster medium. We have measured the SZ effect in the hot galaxy cluster RX J 1347.5 - 1145 with Z-Spec, an R ∼ 300 grating spectrometer sensitive between 185 and 305GHz. These data comprise a high spectral resolution measurement around the null of the SZ effect and clearly exhibit the transition from negative to positive ΔTCMB over the Z-Spec band. The SZ null position is measured to be ν0 = 225.8 ± 2.5(stat.) ± 1.2(sys.)GHz, which differs from the canonical null frequency by 3.0σ and is evidence for modifications to the canonical thermal SZ effect shape. Assuming the measured shift in ν0 is due only to relativistic corrections to the SZ spectrum, we place the limit kTe = 17.1 ± 5.3keV from the zero-point measurement alone. By simulating the response of the instrument to the sky, we are able to generate likelihood functions in {y0, Te, vpec} space. For v pec = 0kms-1, we measure the best-fitting SZ model to be y0 = 4.6+0.6 - 0.9 × 10-4, Te, 0 = 15.2+12 - 7.4keV. When vpec is allowed to vary, a most probable value of vpec = + 450 ± 810kms-1 is found.

Original languageEnglish (US)
Article number114
JournalAstrophysical Journal
Volume749
Issue number2
DOIs
StatePublished - Apr 20 2012
Externally publishedYes

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spectral resolution
high resolution
galaxies
sky
effect
spectrometer
scattering
gratings
spectrometers
shift

Keywords

  • cosmic background radiation
  • galaxies: clusters: individual (RX J1347.5-1145)
  • galaxies: clusters: intracluster medium
  • submillimeter: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Zemcov, M., Aguirre, J., Bock, J., Bradford, C. M., Czakon, N., Glenn, J., ... Zmuidzinas, J. (2012). High spectral resolution measurement of the Sunyaev-Zel'dovich effect null with Z-Spec. Astrophysical Journal, 749(2), [114]. https://doi.org/10.1088/0004-637X/749/2/114

High spectral resolution measurement of the Sunyaev-Zel'dovich effect null with Z-Spec. / Zemcov, M.; Aguirre, J.; Bock, J.; Bradford, C. M.; Czakon, N.; Glenn, J.; Golwala, S. R.; Lupu, R.; Maloney, P.; Mauskopf, Philip; Million, E.; Murphy, E. J.; Naylor, B.; Nguyen, H.; Rosenman, M.; Sayers, J.; Scott, K. S.; Zmuidzinas, J.

In: Astrophysical Journal, Vol. 749, No. 2, 114, 20.04.2012.

Research output: Contribution to journalArticle

Zemcov, M, Aguirre, J, Bock, J, Bradford, CM, Czakon, N, Glenn, J, Golwala, SR, Lupu, R, Maloney, P, Mauskopf, P, Million, E, Murphy, EJ, Naylor, B, Nguyen, H, Rosenman, M, Sayers, J, Scott, KS & Zmuidzinas, J 2012, 'High spectral resolution measurement of the Sunyaev-Zel'dovich effect null with Z-Spec', Astrophysical Journal, vol. 749, no. 2, 114. https://doi.org/10.1088/0004-637X/749/2/114
Zemcov, M. ; Aguirre, J. ; Bock, J. ; Bradford, C. M. ; Czakon, N. ; Glenn, J. ; Golwala, S. R. ; Lupu, R. ; Maloney, P. ; Mauskopf, Philip ; Million, E. ; Murphy, E. J. ; Naylor, B. ; Nguyen, H. ; Rosenman, M. ; Sayers, J. ; Scott, K. S. ; Zmuidzinas, J. / High spectral resolution measurement of the Sunyaev-Zel'dovich effect null with Z-Spec. In: Astrophysical Journal. 2012 ; Vol. 749, No. 2.
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abstract = "The Sunyaev-Zel'dovich (SZ) effect spectrum crosses through a null where ΔTCMB = 0 near ν0 = 217GHz. In a cluster of galaxies, ν0 can be shifted from the canonical thermal SZ effect value by corrections to the SZ effect scattering due to the properties of the inter-cluster medium. We have measured the SZ effect in the hot galaxy cluster RX J 1347.5 - 1145 with Z-Spec, an R ∼ 300 grating spectrometer sensitive between 185 and 305GHz. These data comprise a high spectral resolution measurement around the null of the SZ effect and clearly exhibit the transition from negative to positive ΔTCMB over the Z-Spec band. The SZ null position is measured to be ν0 = 225.8 ± 2.5(stat.) ± 1.2(sys.)GHz, which differs from the canonical null frequency by 3.0σ and is evidence for modifications to the canonical thermal SZ effect shape. Assuming the measured shift in ν0 is due only to relativistic corrections to the SZ spectrum, we place the limit kTe = 17.1 ± 5.3keV from the zero-point measurement alone. By simulating the response of the instrument to the sky, we are able to generate likelihood functions in {y0, Te, vpec} space. For v pec = 0kms-1, we measure the best-fitting SZ model to be y0 = 4.6+0.6 - 0.9 × 10-4, Te, 0 = 15.2+12 - 7.4keV. When vpec is allowed to vary, a most probable value of vpec = + 450 ± 810kms-1 is found.",
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AU - Czakon, N.

AU - Glenn, J.

AU - Golwala, S. R.

AU - Lupu, R.

AU - Maloney, P.

AU - Mauskopf, Philip

AU - Million, E.

AU - Murphy, E. J.

AU - Naylor, B.

AU - Nguyen, H.

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KW - submillimeter: galaxies

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