High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

14 pages, 12 figures, submitted to ApJ

Scientific paper

The Sunyaev-Zel'dovich (SZ) effect spectrum crosses through a null where dT_CMB = 0 near nu_0 = 217 GHz. In a cluster of galaxies, nu_0 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 J1347.5-1145 with Z-Spec, an R ~ 300 grating spectrometer sensitive between 185 and 305 GHz. These data comprise a high spectral resolution measurement around the null of the SZ effect and clearly exhibit the transition from negative to positive dT_CMB over the Z-Spec band. The SZ null position is measured to be nu_0 = 225.8 \pm 2.5 (stat.) \pm 1.2 (sys.) GHz, which differs from the canonical null frequency by 3.0 sigma and is evidence for modifications to the canonical thermal SZ effect shape. Assuming the measured shift in nu_0 is due only to relativistic corrections to the SZ spectrum, we place the limit T_e = 17.1 \pm 5.3 keV from the zero-point measurement alone. By simulating the response of the instrument to the sky, we are able to generate likelihood functions in {y_0, T_e, v_pec} space. For v_pec = 0 km/s, we measure the best fitting SZ model to be y_0 = 4.6 (+0.6, -0.9) x 10^-4, T_e,0 = 15.2 (+12,-7.4) keV. When v_pec is allowed to vary, a most probable value of v_pec = +450 \pm 810 km/s is found.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High Spectral Resolution Measurement of the Sunyaev-Zel'dovich Effect Null with Z-Spec will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-515049

All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.