Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724402z&link_type=abstract
American Astronomical Society, AAS Meeting #217, #244.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The (thermal) Sunyaev-Zel'dovich (SZ) effect is a decrement in the brightness of the cosmic microwave background (CMB) as seen through galaxy clusters at mm wavelengths and an increment at sub-mm wavelengths which passes though a null at 217 GHz when the scatttering plasma is cold. To correctly describe the SZ distortion when relativisitic electrons are present or the cluster is moving with respect to the CMB requires the addition of correction terms usually called the `non-thermal' and `kinetic' SZ effects. These corrections change both the shape and null frequency of the SZ spectral distortion and should be detectable using suitable instruments. We have measured the SZ effect in the bright galaxy cluster RXJ 1347-1145 using Z-Spec, a spectro-photometer which has uniquely high spectral resolution and continuous coverage between 180 and 300 GHz. This paper presents preliminary results of this measurement, cluster parameters derived from it, and the outlook for future measurements of the SZ effect using mm-wave spectro-photometers.
Aguirre James
Bock James Joseph
Bradford Mark
Glenn Jason
Lupu Roxana
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